<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:c2e51235-1211-4e15-9270-88b4f34a91fd,g:cfc6ed3e-9e09-4a9e-a9ba-3ac480e38f46-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://ucbi.com/role/Cover" xlink:type="simple" xlink:href="ucbi-20201231.xsd#Cover"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/Cover" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_80017d37-6985-404b-8a6c-061219a3397a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Deposits"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestBearingDepositLiabilities_086d1f8e-ddd1-4b52-ba1d-fad89fe2b760" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestBearingDepositLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_80017d37-6985-404b-8a6c-061219a3397a" xlink:to="loc_us-gaap_NoninterestBearingDepositLiabilities_086d1f8e-ddd1-4b52-ba1d-fad89fe2b760" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositLiabilities_75f453c5-b279-4233-8cc1-70905a4a7ddb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestBearingDepositLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_80017d37-6985-404b-8a6c-061219a3397a" xlink:to="loc_us-gaap_InterestBearingDepositLiabilities_75f453c5-b279-4233-8cc1-70905a4a7ddb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_d6797e9e-1665-47c6-a3f7-b54a803a4924" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsAndFederalFundsSold"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_d6797e9e-1665-47c6-a3f7-b54a803a4924" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_8f5c7217-ef2b-403a-abf8-ed2cde55f203" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_8f5c7217-ef2b-403a-abf8-ed2cde55f203" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_3d75a094-bfa6-41c0-9ab2-6cb668b094bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecurities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_HeldToMaturitySecurities_3d75a094-bfa6-41c0-9ab2-6cb668b094bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_b989d6d2-fc38-4cc8-bcf4-1c884f95f98d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_b989d6d2-fc38-4cc8-bcf4-1c884f95f98d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_131a8d44-3ae1-4970-a078-94f4fcf8e934" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_NotesReceivableNet_131a8d44-3ae1-4970-a078-94f4fcf8e934" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_b79dbeaa-b5cb-44fd-9518-0ab30cdf0d0f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_b79dbeaa-b5cb-44fd-9518-0ab30cdf0d0f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_bf3075f9-0e5c-4cf1-a38f-1fa6b6ca8891" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BankOwnedLifeInsurance"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_bf3075f9-0e5c-4cf1-a38f-1fa6b6ca8891" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedInvestmentIncomeReceivable_d0377e88-e6dd-4fb6-a71c-66d19b893cba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedInvestmentIncomeReceivable"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_AccruedInvestmentIncomeReceivable_d0377e88-e6dd-4fb6-a71c-66d19b893cba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_9f574c57-7b8f-428d-8138-7847fbdb6138" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_9f574c57-7b8f-428d-8138-7847fbdb6138" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_efcd7bf1-4e36-4a63-88e4-11938c61074e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_efcd7bf1-4e36-4a63-88e4-11938c61074e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_2de99e89-dadb-455d-bc48-38fdad8e2170" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_2de99e89-dadb-455d-bc48-38fdad8e2170" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_39c6b623-56fd-4cd9-ba7b-6f3cd616e0b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0e5cc527-bfd7-4abd-ba5e-21ce692d1fd8" xlink:to="loc_us-gaap_OtherAssets_39c6b623-56fd-4cd9-ba7b-6f3cd616e0b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_6c254444-12ba-4ef8-bab0-94aacba2af1d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_212c58cb-d72d-4931-b48d-6abc4ca1d9e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6c254444-12ba-4ef8-bab0-94aacba2af1d" xlink:to="loc_us-gaap_Liabilities_212c58cb-d72d-4931-b48d-6abc4ca1d9e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_d390dbe0-9654-49a3-89cc-fdf00a174c98" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6c254444-12ba-4ef8-bab0-94aacba2af1d" xlink:to="loc_us-gaap_CommitmentsAndContingencies_d390dbe0-9654-49a3-89cc-fdf00a174c98" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fa977ead-2155-4068-b6cf-e21dc840d465" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6c254444-12ba-4ef8-bab0-94aacba2af1d" xlink:to="loc_us-gaap_StockholdersEquity_fa977ead-2155-4068-b6cf-e21dc840d465" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_ab0b8a35-8650-4cf4-905a-a53d5858a475" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_27de5b0f-d02c-4567-93f1-17936e186d49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Deposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_ab0b8a35-8650-4cf4-905a-a53d5858a475" xlink:to="loc_us-gaap_Deposits_27de5b0f-d02c-4567-93f1-17936e186d49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_191b102f-e2fd-4aed-b5a8-d1cab83eb317" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_ab0b8a35-8650-4cf4-905a-a53d5858a475" xlink:to="loc_us-gaap_LongTermDebt_191b102f-e2fd-4aed-b5a8-d1cab83eb317" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_21d3f9f6-ac82-421b-a187-afe66279797f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_ab0b8a35-8650-4cf4-905a-a53d5858a475" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_21d3f9f6-ac82-421b-a187-afe66279797f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_a69ba64a-5d39-48bb-9abe-fa8a3dcfa2f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_ab0b8a35-8650-4cf4-905a-a53d5858a475" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_a69ba64a-5d39-48bb-9abe-fa8a3dcfa2f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_8ca29571-4c5d-4c2b-97c9-5eb34ed3108f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockIncludingAdditionalPaidInCapitalNetOfDiscount_1af78153-a58b-4001-b4e0-486ca6cd2d57" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockIncludingAdditionalPaidInCapitalNetOfDiscount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_8ca29571-4c5d-4c2b-97c9-5eb34ed3108f" xlink:to="loc_us-gaap_PreferredStockIncludingAdditionalPaidInCapitalNetOfDiscount_1af78153-a58b-4001-b4e0-486ca6cd2d57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_471f8475-a4ef-46f1-a6ac-57e04af1b673" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_8ca29571-4c5d-4c2b-97c9-5eb34ed3108f" xlink:to="loc_us-gaap_CommonStockValue_471f8475-a4ef-46f1-a6ac-57e04af1b673" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_CommonStocksIssuable_ea52d2d6-1ef9-4293-a9df-58d704ef5060" xlink:href="ucbi-20201231.xsd#ucbi_CommonStocksIssuable"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_8ca29571-4c5d-4c2b-97c9-5eb34ed3108f" xlink:to="loc_ucbi_CommonStocksIssuable_ea52d2d6-1ef9-4293-a9df-58d704ef5060" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_243a269a-8f84-4ffb-8d99-5afdb8c35635" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_8ca29571-4c5d-4c2b-97c9-5eb34ed3108f" xlink:to="loc_us-gaap_AdditionalPaidInCapital_243a269a-8f84-4ffb-8d99-5afdb8c35635" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_c78aacd4-20fe-4c8d-9f7a-1d382cdcdc3b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_8ca29571-4c5d-4c2b-97c9-5eb34ed3108f" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_c78aacd4-20fe-4c8d-9f7a-1d382cdcdc3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_be8ba871-11ed-411c-bddd-d0ea8a7e471b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_8ca29571-4c5d-4c2b-97c9-5eb34ed3108f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_be8ba871-11ed-411c-bddd-d0ea8a7e471b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_cd22596d-f668-4da5-b7c7-b94a016cab82" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_906c82c2-bee3-4391-a007-401d518c1cdd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableNet_cd22596d-f668-4da5-b7c7-b94a016cab82" xlink:to="loc_us-gaap_NotesReceivableGross_906c82c2-bee3-4391-a007-401d518c1cdd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_7ab46bd6-f4bf-4fee-a051-8f8a2920b6af" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableNet_cd22596d-f668-4da5-b7c7-b94a016cab82" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_7ab46bd6-f4bf-4fee-a051-8f8a2920b6af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_bc227be1-2633-4cc3-ab53-9cf590854cb5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsAndFederalFundsSold"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndDueFromBanks_715978fa-0253-4925-b410-8b1632537a7f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndDueFromBanks"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_bc227be1-2633-4cc3-ab53-9cf590854cb5" xlink:to="loc_us-gaap_CashAndDueFromBanks_715978fa-0253-4925-b410-8b1632537a7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_771ed9c7-7b15-426b-89ba-b00817e581d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestBearingDepositsInBanks"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_bc227be1-2633-4cc3-ab53-9cf590854cb5" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_771ed9c7-7b15-426b-89ba-b00817e581d3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ConsolidatedBalanceSheetsParenthetical"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ConsolidatedStatementsofIncome"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_038e5192-8048-46ea-a756-ab48ed2332f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_769bd020-89b1-4353-9f37-06ebef119073" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_038e5192-8048-46ea-a756-ab48ed2332f8" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_769bd020-89b1-4353-9f37-06ebef119073" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_f082345b-82fb-4298-9593-c7352f2971e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_038e5192-8048-46ea-a756-ab48ed2332f8" xlink:to="loc_us-gaap_InterestExpense_f082345b-82fb-4298-9593-c7352f2971e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_cbb79187-2d7f-4e73-a005-44848d68102c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_15474cbe-6523-478f-874f-ea2c6b1aaf23" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_cbb79187-2d7f-4e73-a005-44848d68102c" xlink:to="loc_us-gaap_Revenues_15474cbe-6523-478f-874f-ea2c6b1aaf23" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_f5b32e9e-da72-41fb-bf2a-795c39e44b33" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_cbb79187-2d7f-4e73-a005-44848d68102c" xlink:to="loc_us-gaap_NoninterestExpense_f5b32e9e-da72-41fb-bf2a-795c39e44b33" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_0ca417ba-de3a-4600-b84a-9eda70a1213f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOther_e23439ba-d0b1-4c97-be5b-3dc1ada2c7b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeOther"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_0ca417ba-de3a-4600-b84a-9eda70a1213f" xlink:to="loc_us-gaap_NoninterestIncomeOther_e23439ba-d0b1-4c97-be5b-3dc1ada2c7b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_62e3a6a7-7c3c-46e5-b62d-f35797a91a18" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_0ca417ba-de3a-4600-b84a-9eda70a1213f" xlink:to="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_62e3a6a7-7c3c-46e5-b62d-f35797a91a18" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfLoansNet_5847991d-6efa-47e5-bf44-47869722b1fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSalesOfLoansNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_0ca417ba-de3a-4600-b84a-9eda70a1213f" xlink:to="loc_us-gaap_GainLossOnSalesOfLoansNet_5847991d-6efa-47e5-bf44-47869722b1fe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_79ebd658-2352-4018-804f-f30fea208191" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_0ca417ba-de3a-4600-b84a-9eda70a1213f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_79ebd658-2352-4018-804f-f30fea208191" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_d91f34ff-9c54-4222-ae2d-2f3948b056c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeOtherOperatingIncome"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_0ca417ba-de3a-4600-b84a-9eda70a1213f" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_d91f34ff-9c54-4222-ae2d-2f3948b056c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_234eccd3-5277-4f05-8585-ac1276f4b933" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_dd9a3401-41de-47d4-85be-afa35861ac7d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_234eccd3-5277-4f05-8585-ac1276f4b933" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_dd9a3401-41de-47d4-85be-afa35861ac7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxable_5e996fa5-b372-45ee-b36e-82e7ecadcdde" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeSecuritiesTaxable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_234eccd3-5277-4f05-8585-ac1276f4b933" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxable_5e996fa5-b372-45ee-b36e-82e7ecadcdde" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_07de4c0b-98b7-481a-baea-d8cc3612a726" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeSecuritiesTaxExempt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_234eccd3-5277-4f05-8585-ac1276f4b933" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_07de4c0b-98b7-481a-baea-d8cc3612a726" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks_93fad35c-cefb-4d29-b590-338fbea6b0df" xlink:href="ucbi-20201231.xsd#ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_234eccd3-5277-4f05-8585-ac1276f4b933" xlink:to="loc_ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks_93fad35c-cefb-4d29-b590-338fbea6b0df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_a29741d1-8d1d-46ba-bab0-0aab1cca28c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_514bcc34-9bd4-419e-bbf2-1a51782729bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_a29741d1-8d1d-46ba-bab0-0aab1cca28c8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_514bcc34-9bd4-419e-bbf2-1a51782729bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_827052e3-f469-4b2e-9c87-3f061acf9a39" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_a29741d1-8d1d-46ba-bab0-0aab1cca28c8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_827052e3-f469-4b2e-9c87-3f061acf9a39" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_9711f892-e41b-477d-8527-3ad834bba121" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_210aebe7-ffeb-4c78-aadb-9109a717d7d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_9711f892-e41b-477d-8527-3ad834bba121" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_210aebe7-ffeb-4c78-aadb-9109a717d7d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_a34e4ece-28b9-4bf9-98b3-8856920ec1e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanLeaseAndOtherLosses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_9711f892-e41b-477d-8527-3ad834bba121" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_a34e4ece-28b9-4bf9-98b3-8856920ec1e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_05dad7d2-0d80-49b9-af48-05f915fc4d7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_LaborAndRelatedExpense_05dad7d2-0d80-49b9-af48-05f915fc4d7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_954caafd-76bb-4e3e-8429-ce38be82a8bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OccupancyNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_OccupancyNet_954caafd-76bb-4e3e-8429-ce38be82a8bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_a7b669ab-6109-46a4-9635-9002f9921825" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommunicationsAndInformationTechnology"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_a7b669ab-6109-46a4-9635-9002f9921825" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_78e78422-0297-4d58-b702-58e927053111" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfessionalFees"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_ProfessionalFees_78e78422-0297-4d58-b702-58e927053111" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanPortfolioExpense_18eb3214-12fa-4047-a33d-0524e21dd671" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoanPortfolioExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_LoanPortfolioExpense_18eb3214-12fa-4047-a33d-0524e21dd671" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_NoninterestExpenseOutsideServicesElectronicBanking_aa40bb3b-8f13-41e3-8fd8-5835a62e2cba" xlink:href="ucbi-20201231.xsd#ucbi_NoninterestExpenseOutsideServicesElectronicBanking"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_ucbi_NoninterestExpenseOutsideServicesElectronicBanking_aa40bb3b-8f13-41e3-8fd8-5835a62e2cba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuppliesAndPostageExpense_e1a7121d-81de-4c9a-9e0d-26f1bb88308f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SuppliesAndPostageExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_SuppliesAndPostageExpense_e1a7121d-81de-4c9a-9e0d-26f1bb88308f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingAndAdvertisingExpense_0d87499b-717b-4c83-946a-15e5930e04a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_MarketingAndAdvertisingExpense_0d87499b-717b-4c83-946a-15e5930e04a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalDepositInsuranceCorporationPremiumExpense_312ddebd-6496-45f9-8a4b-2be7a909d260" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalDepositInsuranceCorporationPremiumExpense"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_FederalDepositInsuranceCorporationPremiumExpense_312ddebd-6496-45f9-8a4b-2be7a909d260" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_f8942b40-286b-4d16-9da6-8cbbeeaa7529" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_f8942b40-286b-4d16-9da6-8cbbeeaa7529" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_2a0f7774-587b-4819-9807-01f726432412" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_2a0f7774-587b-4819-9807-01f726432412" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_ee9efd7f-89c5-4d46-9c32-f343caaf0c9b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_ebb8033d-e90f-4609-8faf-06b88eee47d0" xlink:to="loc_us-gaap_OtherNoninterestExpense_ee9efd7f-89c5-4d46-9c32-f343caaf0c9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_7daccc66-6752-4e06-8fc3-d6e984a81ffe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8644057c-18d4-442c-8681-8fe41be936d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_7daccc66-6752-4e06-8fc3-d6e984a81ffe" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8644057c-18d4-442c-8681-8fe41be936d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_a6b6d188-d75f-4682-98ea-da019ae1b33e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_7daccc66-6752-4e06-8fc3-d6e984a81ffe" xlink:to="loc_us-gaap_NoninterestIncome_a6b6d188-d75f-4682-98ea-da019ae1b33e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_9e68a450-eda1-41fb-b739-6197315f3347" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDeposits_2c470faa-c4a4-437c-a611-2621a29bd098" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseDeposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_9e68a450-eda1-41fb-b739-6197315f3347" xlink:to="loc_us-gaap_InterestExpenseDeposits_2c470faa-c4a4-437c-a611-2621a29bd098" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOtherShortTermBorrowings_afe97d72-d7f8-43e9-af87-c759fe4b345f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseOtherShortTermBorrowings"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_9e68a450-eda1-41fb-b739-6197315f3347" xlink:to="loc_us-gaap_InterestExpenseOtherShortTermBorrowings_afe97d72-d7f8-43e9-af87-c759fe4b345f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_a0c9cc38-2d90-4149-afad-49036718341b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_9e68a450-eda1-41fb-b739-6197315f3347" xlink:to="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_a0c9cc38-2d90-4149-afad-49036718341b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseLongTermDebt_7b488811-a14e-4e51-a844-afe5579a4f99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseLongTermDebt"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_9e68a450-eda1-41fb-b739-6197315f3347" xlink:to="loc_us-gaap_InterestExpenseLongTermDebt_7b488811-a14e-4e51-a844-afe5579a4f99" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofComprehensiveIncomeLoss" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ConsolidatedStatementsofComprehensiveIncomeLoss"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofComprehensiveIncomeLoss" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_4aa39a72-3801-4029-ac02-ba3917806108" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax_00cfa723-8270-4576-9e39-46825d1a5f17" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_4aa39a72-3801-4029-ac02-ba3917806108" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax_00cfa723-8270-4576-9e39-46825d1a5f17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect_68667dc3-bbd8-4e25-9d11-6b19909e1c9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_4aa39a72-3801-4029-ac02-ba3917806108" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect_68667dc3-bbd8-4e25-9d11-6b19909e1c9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_8ade9ffc-7b6a-444a-a215-0fb3eec2ed71" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_e86e199d-a6ec-4804-a524-51f58fb14f13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_8ade9ffc-7b6a-444a-a215-0fb3eec2ed71" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_e86e199d-a6ec-4804-a524-51f58fb14f13" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_a40161d8-1f95-4f27-abdd-63d219fa0fe5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_8ade9ffc-7b6a-444a-a215-0fb3eec2ed71" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_a40161d8-1f95-4f27-abdd-63d219fa0fe5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_026fee35-9aa3-4823-9078-67e7894eabb7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_8a94d9d3-7346-4638-b10a-2b6558371c39" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_026fee35-9aa3-4823-9078-67e7894eabb7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_8a94d9d3-7346-4638-b10a-2b6558371c39" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_d141b979-c2f6-4cee-866a-627783ae7b61" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_026fee35-9aa3-4823-9078-67e7894eabb7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_d141b979-c2f6-4cee-866a-627783ae7b61" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_35d106cc-77be-4f00-82d0-60e19998f3a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_4d1b9ede-9191-4db7-9816-87db40974371" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_35d106cc-77be-4f00-82d0-60e19998f3a7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_4d1b9ede-9191-4db7-9816-87db40974371" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_20007cc5-49c2-410c-9c83-e7ff3cdd81c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_35d106cc-77be-4f00-82d0-60e19998f3a7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_20007cc5-49c2-410c-9c83-e7ff3cdd81c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_5ef7c059-f776-46b1-a3b5-d9bf77f9d966" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_e7fb0a95-f98f-4326-8bc6-1ad471acae07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_5ef7c059-f776-46b1-a3b5-d9bf77f9d966" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_e7fb0a95-f98f-4326-8bc6-1ad471acae07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_81f95e5f-5a15-458e-941a-0d2aed19a03e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_5ef7c059-f776-46b1-a3b5-d9bf77f9d966" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_81f95e5f-5a15-458e-941a-0d2aed19a03e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_83f1d43e-cbff-4e55-9966-85f4ffbbef30" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_3032d216-a321-4775-bbd6-1a2efffa7cdb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_83f1d43e-cbff-4e55-9966-85f4ffbbef30" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_3032d216-a321-4775-bbd6-1a2efffa7cdb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_b16c2fcd-212b-42e0-878b-768770f014a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_83f1d43e-cbff-4e55-9966-85f4ffbbef30" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_b16c2fcd-212b-42e0-878b-768770f014a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_d00a398c-51f0-4f24-86ff-a52d033c9340" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_85bebf4c-d9dd-4f63-829e-2143cffd4f50" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_d00a398c-51f0-4f24-86ff-a52d033c9340" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_85bebf4c-d9dd-4f63-829e-2143cffd4f50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit1_d6174075-f4f3-494f-b96e-7ce64008fa99" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit1"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_d00a398c-51f0-4f24-86ff-a52d033c9340" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit1_d6174075-f4f3-494f-b96e-7ce64008fa99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_143f6947-4dca-49d6-8d8c-eef201cae8eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_7873afb1-2b2e-4a6a-999e-01ee99237c9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_143f6947-4dca-49d6-8d8c-eef201cae8eb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_7873afb1-2b2e-4a6a-999e-01ee99237c9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent_ecf85682-afd8-4c51-a1ff-ba2b2d0d6c18" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_143f6947-4dca-49d6-8d8c-eef201cae8eb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent_ecf85682-afd8-4c51-a1ff-ba2b2d0d6c18" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_e1d6eefe-256b-42d2-b60c-8a75c9de9393" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_cfd65d92-0d62-41ee-a0f1-eeb960c2f11b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_e1d6eefe-256b-42d2-b60c-8a75c9de9393" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_cfd65d92-0d62-41ee-a0f1-eeb960c2f11b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_76e92793-3498-4923-a885-3d8e7d4a28c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_e1d6eefe-256b-42d2-b60c-8a75c9de9393" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_76e92793-3498-4923-a885-3d8e7d4a28c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_91e1a85b-fab6-4739-a791-b5b5fc01eb46" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_3fe2aaeb-6be4-4c23-967c-0b9eefd5b0f5" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_91e1a85b-fab6-4739-a791-b5b5fc01eb46" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_3fe2aaeb-6be4-4c23-967c-0b9eefd5b0f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_dc2723fa-ab80-4eb1-b3e6-5247cfeb2fe7" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_91e1a85b-fab6-4739-a791-b5b5fc01eb46" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_dc2723fa-ab80-4eb1-b3e6-5247cfeb2fe7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_fbc8cd22-b954-498b-b73a-1a1d76c200d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_74713c79-fd5c-4206-89d3-1ac0ab9a3366" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_fbc8cd22-b954-498b-b73a-1a1d76c200d4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_74713c79-fd5c-4206-89d3-1ac0ab9a3366" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_af662b44-da7a-4802-921e-6fd5a19d3470" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_fbc8cd22-b954-498b-b73a-1a1d76c200d4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_af662b44-da7a-4802-921e-6fd5a19d3470" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_ec0d348c-6b79-4eca-a4a1-813c6e87ed31" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_a2a7a51e-3009-4397-b3d4-0fdafd8029b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_ec0d348c-6b79-4eca-a4a1-813c6e87ed31" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_a2a7a51e-3009-4397-b3d4-0fdafd8029b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_660a1894-ce7b-4a34-ba52-33bbd8c006bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_ec0d348c-6b79-4eca-a4a1-813c6e87ed31" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_660a1894-ce7b-4a34-ba52-33bbd8c006bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_c1f301d1-4ebc-435e-beec-b01e3d539cd2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_bd8d8583-877f-4c14-83c6-71adbab9916b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_c1f301d1-4ebc-435e-beec-b01e3d539cd2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_bd8d8583-877f-4c14-83c6-71adbab9916b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_bcd22f24-709e-4be4-8358-0100d895d2da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_c1f301d1-4ebc-435e-beec-b01e3d539cd2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_bcd22f24-709e-4be4-8358-0100d895d2da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_60211f9e-a724-4b1f-9023-b0a5ab590665" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ComprehensiveIncomeLossBeforeTax_af23abcd-544f-4ddc-93df-cb8a1f7e5557" xlink:href="ucbi-20201231.xsd#ucbi_ComprehensiveIncomeLossBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_60211f9e-a724-4b1f-9023-b0a5ab590665" xlink:to="loc_ucbi_ComprehensiveIncomeLossBeforeTax_af23abcd-544f-4ddc-93df-cb8a1f7e5557" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ComprehensiveIncomeLossTax_616f8f3e-fe74-42b7-9893-a436f7ae511c" xlink:href="ucbi-20201231.xsd#ucbi_ComprehensiveIncomeLossTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_60211f9e-a724-4b1f-9023-b0a5ab590665" xlink:to="loc_ucbi_ComprehensiveIncomeLossTax_616f8f3e-fe74-42b7-9893-a436f7ae511c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_b07f33e9-de5b-47e7-a1f5-60be1a3d5e66" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax_806292e7-b9c3-4541-b2e1-60eb1a9a77b1" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_b07f33e9-de5b-47e7-a1f5-60be1a3d5e66" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax_806292e7-b9c3-4541-b2e1-60eb1a9a77b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax_742276ea-5e7e-4178-96f3-88772b01191b" xlink:href="ucbi-20201231.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_b07f33e9-de5b-47e7-a1f5-60be1a3d5e66" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax_742276ea-5e7e-4178-96f3-88772b01191b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofChangesinShareholdersEquity" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ConsolidatedStatementsofChangesinShareholdersEquity"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofChangesinShareholdersEquity" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofChangesinShareholdersEquityParenthetical" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ConsolidatedStatementsofChangesinShareholdersEquityParenthetical"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofChangesinShareholdersEquityParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeposits_3c4846e5-e3c8-49df-bfcb-a9adc228a825" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInDeposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_3c4846e5-e3c8-49df-bfcb-a9adc228a825" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfShortTermDebt_e66ee572-641b-4825-9bf2-29d2c49a110e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfShortTermDebt"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_RepaymentsOfShortTermDebt_e66ee572-641b-4825-9bf2-29d2c49a110e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_d9a9e2ed-c676-4962-83d0-23521080c31f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromFederalHomeLoanBankBorrowings"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_d9a9e2ed-c676-4962-83d0-23521080c31f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_64882efb-afbc-4279-b41b-02c6a13ef7a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_64882efb-afbc-4279-b41b-02c6a13ef7a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfOtherLongTermDebt_b7ae84c5-f869-43cd-a66d-074f29e47c92" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfOtherLongTermDebt"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_RepaymentsOfOtherLongTermDebt_b7ae84c5-f869-43cd-a66d-074f29e47c92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_a1b3bc98-c71f-4a66-b696-b5821cb8c4f3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_a1b3bc98-c71f-4a66-b696-b5821cb8c4f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans_9bd991ef-a0d8-423b-bec6-f8ee7562c6b9" xlink:href="ucbi-20201231.xsd#ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans_9bd991ef-a0d8-423b-bec6-f8ee7562c6b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_6f42e98f-0fa2-4f0b-92f2-d62d36e8b5ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_6f42e98f-0fa2-4f0b-92f2-d62d36e8b5ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_a4b4a47c-bf82-4cb6-8a69-977d8fb668b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_a4b4a47c-bf82-4cb6-8a69-977d8fb668b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_7102fee2-fdd0-431c-a983-b55d6f6c1125" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_7102fee2-fdd0-431c-a983-b55d6f6c1125" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_cdd0cd5e-07fb-4620-84c4-80424662dde9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_cdd0cd5e-07fb-4620-84c4-80424662dde9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_466c0dfb-f2a6-4614-8bf8-399439419ec0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_466c0dfb-f2a6-4614-8bf8-399439419ec0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_04ae7211-b34d-4744-9b48-9b7132912122" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9b95e2b1-ee5a-45d0-b9c0-dc5e1767ce06" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_04ae7211-b34d-4744-9b48-9b7132912122" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_7d25d0cb-13bc-4b17-92eb-277a6dc26bfd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_NetIncomeLoss_7d25d0cb-13bc-4b17-92eb-277a6dc26bfd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_e9282388-408c-466e-a10c-97c3134c02c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_e9282388-408c-466e-a10c-97c3134c02c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_0cc742b0-acf1-4461-8bce-a5f310d09e6b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanLeaseAndOtherLosses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_0cc742b0-acf1-4461-8bce-a5f310d09e6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_8fb5389d-921f-4ef0-8ef5-1a77fd6fd420" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_ShareBasedCompensation_8fb5389d-921f-4ef0-8ef5-1a77fd6fd420" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_72130f20-df1e-487f-a61d-6771e66282b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_72130f20-df1e-487f-a61d-6771e66282b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_0d42947f-cd91-461b-94f5-0b3d260db80e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_0d42947f-cd91-461b-94f5-0b3d260db80e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_224968f8-e383-41ec-85b1-7c4b8e2d43db" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfLoansAndLeases"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_224968f8-e383-41ec-85b1-7c4b8e2d43db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_d45142dd-442e-4789-977c-91b5e1075a9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_d45142dd-442e-4789-977c-91b5e1075a9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_513f40e2-0496-4b5c-b909-bbf7ec4ae2b0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_513f40e2-0496-4b5c-b909-bbf7ec4ae2b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_bf22a80a-f875-4845-86db-12e9d6298922" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInLoansHeldForSale"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_92dbf7f6-a6a2-4e49-98d4-217ea959257c" xlink:to="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_bf22a80a-f875-4845-86db-12e9d6298922" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_949f0756-539d-4c9f-bcd8-68698060a805" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_85576408-b364-4073-8146-5c5033098340" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_949f0756-539d-4c9f-bcd8-68698060a805" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_85576408-b364-4073-8146-5c5033098340" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_f7533fd4-c5de-451a-a0b5-f67a0831c384" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_949f0756-539d-4c9f-bcd8-68698060a805" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_f7533fd4-c5de-451a-a0b5-f67a0831c384" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e3ff740e-5a79-4aac-a319-c306639f389e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_949f0756-539d-4c9f-bcd8-68698060a805" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e3ff740e-5a79-4aac-a319-c306639f389e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_1d1237e7-1f60-436c-a9ed-d6cc65c50ae2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_1d1237e7-1f60-436c-a9ed-d6cc65c50ae2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_3a55eec0-e0a8-48da-9f71-e1fd0c67ae91" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_3a55eec0-e0a8-48da-9f71-e1fd0c67ae91" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_f7abe55e-a7be-4315-8607-83a179c49049" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_f7abe55e-a7be-4315-8607-83a179c49049" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5f7dec7c-7ef5-44a6-8348-fbea6eb0300e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5f7dec7c-7ef5-44a6-8348-fbea6eb0300e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_efc8bd21-ba54-4956-a2fc-cae808ef862b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_efc8bd21-ba54-4956-a2fc-cae808ef862b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireFinanceReceivables_1541094f-00eb-4093-b62c-65b49fbc55d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireFinanceReceivables"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_PaymentsToAcquireFinanceReceivables_1541094f-00eb-4093-b62c-65b49fbc55d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_132c620a-36c5-4351-a42b-4fe6b1c865dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_132c620a-36c5-4351-a42b-4fe6b1c865dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_790cc2c1-1474-4383-b77f-8983ddcc36d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_790cc2c1-1474-4383-b77f-8983ddcc36d3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_08870552-29c6-4415-b554-54d04565c0e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_08870552-29c6-4415-b554-54d04565c0e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_480012ca-9345-4f3f-afe7-deaf7491c2a3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherRealEstate"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_480012ca-9345-4f3f-afe7-deaf7491c2a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3223fb72-603e-44b6-ab72-ac21664f038b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4d751a0b-b8de-4938-a1f3-23dd75cd3b6d" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3223fb72-603e-44b6-ab72-ac21664f038b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/SummaryofSignificantAccountingPolicies" xlink:type="simple" xlink:href="ucbi-20201231.xsd#SummaryofSignificantAccountingPolicies"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SummaryofSignificantAccountingPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="ucbi-20201231.xsd#SummaryofSignificantAccountingPoliciesPolicies"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#SummaryofSignificantAccountingPoliciesDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AccountingStandardsUpdatesandRecentlyAdoptedStandards" xlink:type="simple" xlink:href="ucbi-20201231.xsd#AccountingStandardsUpdatesandRecentlyAdoptedStandards"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingStandardsUpdatesandRecentlyAdoptedStandards" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AccountingStandardsUpdatesandRecentlyAdoptedStandardsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#AccountingStandardsUpdatesandRecentlyAdoptedStandardsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingStandardsUpdatesandRecentlyAdoptedStandardsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/MergersandAcquisitions" xlink:type="simple" xlink:href="ucbi-20201231.xsd#MergersandAcquisitions"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/MergersandAcquisitions" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/MergersandAcquisitionsTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#MergersandAcquisitionsTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/MergersandAcquisitionsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/MergersandAcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#MergersandAcquisitionsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/MergersandAcquisitionsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/MergersandAcquisitionsAcquisitiondatefairvalueofpurchasedassetsandassumedliabilitiesDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#MergersandAcquisitionsAcquisitiondatefairvalueofpurchasedassetsandassumedliabilitiesDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/MergersandAcquisitionsAcquisitiondatefairvalueofpurchasedassetsandassumedliabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_596884bb-850c-4156-bf69-a151ad1e424c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_596884bb-850c-4156-bf69-a151ad1e424c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities_637d7c7a-a41f-4d6e-aa61-d6e5cd4e8d6a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities_637d7c7a-a41f-4d6e-aa61-d6e5cd4e8d6a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_9f7a379c-fa91-4481-a588-490e3ce29aee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_9f7a379c-fa91-4481-a588-490e3ce29aee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_ae402a7e-7aa3-4235-aa93-01d3366da65c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_ae402a7e-7aa3-4235-aa93-01d3366da65c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_b89a60c3-cbf2-44fc-b44f-834496a1a277" xlink:href="ucbi-20201231.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_b89a60c3-cbf2-44fc-b44f-834496a1a277" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivables_d30eb989-02dc-4914-b2df-a47e23e861ec" xlink:href="ucbi-20201231.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivables"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivables_d30eb989-02dc-4914-b2df-a47e23e861ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDerivativeAssets_dc7dc245-7f78-4c35-afa0-fc7ff3fcffa0" xlink:href="ucbi-20201231.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDerivativeAssets"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDerivativeAssets_dc7dc245-7f78-4c35-afa0-fc7ff3fcffa0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_1ed6e948-6e2c-4ddd-919c-f714226b6cb5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_1ed6e948-6e2c-4ddd-919c-f714226b6cb5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_21d07adb-a1bb-436a-89ba-34662f587df6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_21d07adb-a1bb-436a-89ba-34662f587df6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_af467524-10d6-483c-897d-9bc3fe1c6dcd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_e114c263-d43a-4a83-acb3-5d26ce2ec028" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_af467524-10d6-483c-897d-9bc3fe1c6dcd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_57295cbe-a9d7-4179-b56e-e53eb91a2128" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_6c1ba30f-939b-4cef-90cc-d1c3bc650ddb" xlink:href="ucbi-20201231.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_57295cbe-a9d7-4179-b56e-e53eb91a2128" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_6c1ba30f-939b-4cef-90cc-d1c3bc650ddb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvancesAndLongTermDebt_52749afc-5c9c-4f2f-b7f5-243a9b353fb1" xlink:href="ucbi-20201231.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvancesAndLongTermDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_57295cbe-a9d7-4179-b56e-e53eb91a2128" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvancesAndLongTermDebt_52749afc-5c9c-4f2f-b7f5-243a9b353fb1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDerivatives_f3e4af66-e2c1-432c-93b4-98bfac9efb8a" xlink:href="ucbi-20201231.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDerivatives"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_57295cbe-a9d7-4179-b56e-e53eb91a2128" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDerivatives_f3e4af66-e2c1-432c-93b4-98bfac9efb8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermBorrowings_3243f791-2027-4d45-99ab-ef89d13e09e3" xlink:href="ucbi-20201231.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermBorrowings"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_57295cbe-a9d7-4179-b56e-e53eb91a2128" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermBorrowings_3243f791-2027-4d45-99ab-ef89d13e09e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_ba7caf5b-9686-4cac-bad3-fc246bac5e98" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_57295cbe-a9d7-4179-b56e-e53eb91a2128" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_ba7caf5b-9686-4cac-bad3-fc246bac5e98" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_1070ac9a-10af-488d-9611-b3d8f7239fdb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_57295cbe-a9d7-4179-b56e-e53eb91a2128" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_1070ac9a-10af-488d-9611-b3d8f7239fdb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_3eb97295-6b25-4fd2-804d-f8370932aadb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_55b487d1-1141-458b-999b-7917b28d7116" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_3eb97295-6b25-4fd2-804d-f8370932aadb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_55b487d1-1141-458b-999b-7917b28d7116" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_0563cc59-44b4-493e-a5a2-80c14bc1ca27" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_3eb97295-6b25-4fd2-804d-f8370932aadb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_0563cc59-44b4-493e-a5a2-80c14bc1ca27" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/MergersandAcquisitionsAcquiredloanandleaseportfolioatacquisitionDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#MergersandAcquisitionsAcquiredloanandleaseportfolioatacquisitionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/MergersandAcquisitionsAcquiredloanandleaseportfolioatacquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition_0070c76e-1370-4d03-8a2a-2ddb0e5268fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition_2a7be859-58d6-484e-8979-fb5372c1e25c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition_0070c76e-1370-4d03-8a2a-2ddb0e5268fd" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition_2a7be859-58d6-484e-8979-fb5372c1e25c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_af5b9fc5-a74e-494a-a80b-d20ac100ad40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition_0070c76e-1370-4d03-8a2a-2ddb0e5268fd" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_af5b9fc5-a74e-494a-a80b-d20ac100ad40" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_a3998d06-0896-40bb-9683-333d152936dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_301bdec1-f101-4342-90b1-7feee0e5af4f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_a3998d06-0896-40bb-9683-333d152936dc" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_301bdec1-f101-4342-90b1-7feee0e5af4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_7a75d01d-8975-4dff-a1bf-09311951e40b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_a3998d06-0896-40bb-9683-333d152936dc" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_7a75d01d-8975-4dff-a1bf-09311951e40b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_0741d8bc-f593-468e-a66c-672400ba5383" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_a3998d06-0896-40bb-9683-333d152936dc" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_0741d8bc-f593-468e-a66c-672400ba5383" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/MergersandAcquisitionsProformainformationDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#MergersandAcquisitionsProformainformationDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/MergersandAcquisitionsProformainformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CashFlows" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CashFlows"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CashFlows" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CashFlowsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CashFlowsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CashFlowsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecurities" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecurities"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecurities" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesCostbasisunrealizedgainsandlossesandfairvalueofdebtsecuritiesheldtomaturityDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesCostbasisunrealizedgainsandlossesandfairvalueofdebtsecuritiesheldtomaturityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesCostbasisunrealizedgainsandlossesandfairvalueofdebtsecuritiesheldtomaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_3119836a-6997-48f0-a32c-ac8406b5730f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_6e63e73f-fd77-41d4-8236-94d48c22d34a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_3119836a-6997-48f0-a32c-ac8406b5730f" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_6e63e73f-fd77-41d4-8236-94d48c22d34a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_e0f39f33-f23e-4192-b68a-885504e93c08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_3119836a-6997-48f0-a32c-ac8406b5730f" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_e0f39f33-f23e-4192-b68a-885504e93c08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_e40a7d27-4dfb-46dc-9457-4c5ccd86a5de" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_3119836a-6997-48f0-a32c-ac8406b5730f" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_e40a7d27-4dfb-46dc-9457-4c5ccd86a5de" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesCostbasisunrealizedgainsandlossesandfairvalueofdebtsecuritiesavailableforsaleDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesCostbasisunrealizedgainsandlossesandfairvalueofdebtsecuritiesavailableforsaleDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesCostbasisunrealizedgainsandlossesandfairvalueofdebtsecuritiesavailableforsaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_0a2b44c1-526e-444c-86eb-ed81231a1ee3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_dad449c8-8d0b-4968-88a8-f9f7892ba74c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_0a2b44c1-526e-444c-86eb-ed81231a1ee3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_dad449c8-8d0b-4968-88a8-f9f7892ba74c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_6d25b945-df7c-445f-8af1-ab5e0e2796e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_0a2b44c1-526e-444c-86eb-ed81231a1ee3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_6d25b945-df7c-445f-8af1-ab5e0e2796e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_311d7603-f9f0-4d55-a792-c3a3f3c761a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_0a2b44c1-526e-444c-86eb-ed81231a1ee3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_311d7603-f9f0-4d55-a792-c3a3f3c761a2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesSummaryofheldtomaturitysecuritiesinunrealizedlosspositionDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesSummaryofheldtomaturitysecuritiesinunrealizedlosspositionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesSummaryofheldtomaturitysecuritiesinunrealizedlosspositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_c771ee06-f0b5-48b6-ad55-71d71bf57c91" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_c8b1721f-7c09-4f8b-8522-c5209f1d0bdc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_c771ee06-f0b5-48b6-ad55-71d71bf57c91" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_c8b1721f-7c09-4f8b-8522-c5209f1d0bdc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_8abecaa9-951c-47e4-b3f2-6565afb30ce3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_c771ee06-f0b5-48b6-ad55-71d71bf57c91" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_8abecaa9-951c-47e4-b3f2-6565afb30ce3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_89b46fec-cd00-49fa-863c-15b0e899cce3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_e3f53ab0-bdef-41f6-9030-0e502d811e5c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_89b46fec-cd00-49fa-863c-15b0e899cce3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_e3f53ab0-bdef-41f6-9030-0e502d811e5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_710c212e-0117-48b9-a400-f60ffaa8303f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_89b46fec-cd00-49fa-863c-15b0e899cce3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_710c212e-0117-48b9-a400-f60ffaa8303f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesSummaryofavailableforsalesecuritiesinunrealizedlosspositionDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesSummaryofavailableforsalesecuritiesinunrealizedlosspositionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesSummaryofavailableforsalesecuritiesinunrealizedlosspositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_3421f45f-b22a-4080-8685-203676ac9b35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_d85f9236-c14d-4eba-aa14-0109a70981b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_3421f45f-b22a-4080-8685-203676ac9b35" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_d85f9236-c14d-4eba-aa14-0109a70981b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_a39949af-52b0-43f4-a425-e7f42a6bc75c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_3421f45f-b22a-4080-8685-203676ac9b35" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_a39949af-52b0-43f4-a425-e7f42a6bc75c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_6ea40c47-7811-48fd-baf9-546783c76970" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_0ccc706e-bd43-4989-b75c-dd09d827bd4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_6ea40c47-7811-48fd-baf9-546783c76970" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_0ccc706e-bd43-4989-b75c-dd09d827bd4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_748b97ac-089c-400b-9904-8ce97ab3a8bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_6ea40c47-7811-48fd-baf9-546783c76970" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_748b97ac-089c-400b-9904-8ce97ab3a8bd" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesSummaryofsecuritiessalesactivityDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesSummaryofsecuritiessalesactivityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesSummaryofsecuritiessalesactivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_1433b508-d22f-4342-8ddc-23a636a4416f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_efa5e69b-3b84-47f1-995a-f06b9a619351" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGain"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_1433b508-d22f-4342-8ddc-23a636a4416f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_efa5e69b-3b84-47f1-995a-f06b9a619351" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_e5053e3c-5253-4770-a87f-4b4a7e8ba45f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_1433b508-d22f-4342-8ddc-23a636a4416f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_e5053e3c-5253-4770-a87f-4b4a7e8ba45f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/InvestmentSecuritiesAmortizedcostandfairvalueofheldtomaturityandavailableforsalesecuritiesbycontractualmaturityDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#InvestmentSecuritiesAmortizedcostandfairvalueofheldtomaturityandavailableforsalesecuritiesbycontractualmaturityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/InvestmentSecuritiesAmortizedcostandfairvalueofheldtomaturityandavailableforsalesecuritiesbycontractualmaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_513cdfbf-f63c-4e43-a5db-6e53224f7371" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_dba8280a-6488-4f29-8ed0-9df01635f406" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_513cdfbf-f63c-4e43-a5db-6e53224f7371" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_dba8280a-6488-4f29-8ed0-9df01635f406" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_7a48001a-4e94-482c-a7fe-f27567a30789" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_513cdfbf-f63c-4e43-a5db-6e53224f7371" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_7a48001a-4e94-482c-a7fe-f27567a30789" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_095f57ea-54ed-4f28-9f8e-3666dabd9306" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_513cdfbf-f63c-4e43-a5db-6e53224f7371" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_095f57ea-54ed-4f28-9f8e-3666dabd9306" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue_a1c6c00d-b310-4ce0-be00-22e37424ddf6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_513cdfbf-f63c-4e43-a5db-6e53224f7371" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue_a1c6c00d-b310-4ce0-be00-22e37424ddf6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_f2de172b-94b2-42c4-9f74-b649ab8c7af4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_513cdfbf-f63c-4e43-a5db-6e53224f7371" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_f2de172b-94b2-42c4-9f74-b649ab8c7af4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ea11adce-02e8-4338-99be-e288fa33d124" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_bc5d60e4-2f68-4f25-840a-1b2c387fb668" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ea11adce-02e8-4338-99be-e288fa33d124" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_bc5d60e4-2f68-4f25-840a-1b2c387fb668" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_b947df4a-a51e-44a3-9d7d-3ae57ee443be" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ea11adce-02e8-4338-99be-e288fa33d124" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_b947df4a-a51e-44a3-9d7d-3ae57ee443be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_e9d262e3-173d-4fb8-a696-1c0086a17580" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ea11adce-02e8-4338-99be-e288fa33d124" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_e9d262e3-173d-4fb8-a696-1c0086a17580" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_a52af9d1-8e9a-43ea-8f5b-2c63389c277a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ea11adce-02e8-4338-99be-e288fa33d124" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_a52af9d1-8e9a-43ea-8f5b-2c63389c277a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_f78acaf5-7e9a-4687-855c-79cc2848394f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ea11adce-02e8-4338-99be-e288fa33d124" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_f78acaf5-7e9a-4687-855c-79cc2848394f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_986e3727-5006-447b-b0e2-f946c92d0f2b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_83a01c9f-122f-424c-be1d-a0edd0fe4be0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_986e3727-5006-447b-b0e2-f946c92d0f2b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_83a01c9f-122f-424c-be1d-a0edd0fe4be0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_f9238180-38a7-45d4-8ad7-8b3b7419d0cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_986e3727-5006-447b-b0e2-f946c92d0f2b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_f9238180-38a7-45d4-8ad7-8b3b7419d0cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_4ab1c117-817a-4f5f-9c81-11cfa2d20f73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_986e3727-5006-447b-b0e2-f946c92d0f2b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_4ab1c117-817a-4f5f-9c81-11cfa2d20f73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_26b0f72c-7e79-4739-a315-e1932a45c1ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_986e3727-5006-447b-b0e2-f946c92d0f2b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_26b0f72c-7e79-4739-a315-e1932a45c1ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount_857923f4-0da3-49f0-8e23-06b5b914dcb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecurities_986e3727-5006-447b-b0e2-f946c92d0f2b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount_857923f4-0da3-49f0-8e23-06b5b914dcb4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a847264-3125-4b4d-bd93-891051c57330" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_d22f40de-245e-4118-a3d8-d19278443412" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a847264-3125-4b4d-bd93-891051c57330" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_d22f40de-245e-4118-a3d8-d19278443412" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_3aa919ff-3641-48cb-84dd-77bfbd7fb3eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a847264-3125-4b4d-bd93-891051c57330" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_3aa919ff-3641-48cb-84dd-77bfbd7fb3eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_30e596f4-1453-44e4-98ff-69e28c0b9bbb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a847264-3125-4b4d-bd93-891051c57330" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_30e596f4-1453-44e4-98ff-69e28c0b9bbb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_9965ae5c-4ae2-43b6-8f90-7eb491fd1cf0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a847264-3125-4b4d-bd93-891051c57330" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_9965ae5c-4ae2-43b6-8f90-7eb491fd1cf0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_7727c059-4fb4-4bc3-b03b-85b3dbde1df3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a847264-3125-4b4d-bd93-891051c57330" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_7727c059-4fb4-4bc3-b03b-85b3dbde1df3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLosses" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLosses"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLosses" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMajorclassificationsoftheloanandleaseportfolioDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesMajorclassificationsoftheloanandleaseportfolioDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMajorclassificationsoftheloanandleaseportfolioDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansSoldDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesLoansSoldDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansSoldDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesComponentsofnetinvestmentinleasesDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesComponentsofnetinvestmentinleasesDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesComponentsofnetinvestmentinleasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentInLease_33dea8f4-6327-478d-8ad0-6790e10f5987" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetInvestmentInLease"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable_7fa76055-6cf5-4e5a-8015-a6358c9ee3bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetInvestmentInLease_33dea8f4-6327-478d-8ad0-6790e10f5987" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable_7fa76055-6cf5-4e5a-8015-a6358c9ee3bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesUnguaranteedResidualAsset_7cefcb9a-d2fb-4291-9829-b1ecc60dc4ad" xlink:href="ucbi-20201231.xsd#ucbi_SalesTypeAndDirectFinancingLeasesUnguaranteedResidualAsset"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetInvestmentInLease_33dea8f4-6327-478d-8ad0-6790e10f5987" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesUnguaranteedResidualAsset_7cefcb9a-d2fb-4291-9829-b1ecc60dc4ad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesInitialDirectCosts_5a640a4a-f46c-4348-b2fb-769ca981733e" xlink:href="ucbi-20201231.xsd#ucbi_SalesTypeAndDirectFinancingLeasesInitialDirectCosts"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetInvestmentInLease_33dea8f4-6327-478d-8ad0-6790e10f5987" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesInitialDirectCosts_5a640a4a-f46c-4348-b2fb-769ca981733e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesSecurityDeposits_afaaaf8d-6057-4ff6-b38a-88365b9cbad2" xlink:href="ucbi-20201231.xsd#ucbi_SalesTypeAndDirectFinancingLeasesSecurityDeposits"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetInvestmentInLease_33dea8f4-6327-478d-8ad0-6790e10f5987" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesSecurityDeposits_afaaaf8d-6057-4ff6-b38a-88365b9cbad2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesPurchaseAccountingPremium_53b2c56a-10a2-4c1e-96af-928c2a955eaf" xlink:href="ucbi-20201231.xsd#ucbi_SalesTypeAndDirectFinancingLeasesPurchaseAccountingPremium"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetInvestmentInLease_33dea8f4-6327-478d-8ad0-6790e10f5987" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesPurchaseAccountingPremium_53b2c56a-10a2-4c1e-96af-928c2a955eaf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesDeferredSellingProfit_610e3357-897a-4f69-924d-e4a474f0055d" xlink:href="ucbi-20201231.xsd#ucbi_SalesTypeAndDirectFinancingLeasesDeferredSellingProfit"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetInvestmentInLease_33dea8f4-6327-478d-8ad0-6790e10f5987" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesDeferredSellingProfit_610e3357-897a-4f69-924d-e4a474f0055d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMinimumfutureleasepaymentstobereceivedDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesMinimumfutureleasepaymentstobereceivedDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMinimumfutureleasepaymentstobereceivedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_dede78b3-2397-4a21-b23b-7d8ade5f7474" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_09c879a9-7c44-4775-9a94-10a852c8604a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_dede78b3-2397-4a21-b23b-7d8ade5f7474" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_09c879a9-7c44-4775-9a94-10a852c8604a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_60f25f92-b972-4d9d-9f10-e1b321a7fb3c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_dede78b3-2397-4a21-b23b-7d8ade5f7474" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_60f25f92-b972-4d9d-9f10-e1b321a7fb3c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_1c4858b0-d6d4-45f2-b3e9-ee86e024372f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_dede78b3-2397-4a21-b23b-7d8ade5f7474" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_1c4858b0-d6d4-45f2-b3e9-ee86e024372f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_2326cba1-4096-4dcb-bad5-5f7b5ba07709" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_dede78b3-2397-4a21-b23b-7d8ade5f7474" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_2326cba1-4096-4dcb-bad5-5f7b5ba07709" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_4bbf267e-bdba-430a-8420-215b6715a067" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_dede78b3-2397-4a21-b23b-7d8ade5f7474" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_4bbf267e-bdba-430a-8420-215b6715a067" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter_e49c243c-1979-4b14-8558-4a64f3c2087b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_dede78b3-2397-4a21-b23b-7d8ade5f7474" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter_e49c243c-1979-4b14-8558-4a64f3c2087b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAgingofamortizedcostbasisinloansbyagingcategoryandaccrualstatusDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesAgingofamortizedcostbasisinloansbyagingcategoryandaccrualstatusDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAgingofamortizedcostbasisinloansbyagingcategoryandaccrualstatusDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAgingofrecordedinvestmentinloansincludingaccruingandnonaccrualloansDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesAgingofrecordedinvestmentinloansincludingaccruingandnonaccrualloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAgingofrecordedinvestmentinloansincludingaccruingandnonaccrualloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinnonaccrualloansbyloanclassDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinnonaccrualloansbyloanclassDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinnonaccrualloansbyloanclassDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAmortizedcostofloansbyriskcategorybyvintageyearDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesAmortizedcostofloansbyriskcategorybyvintageyearDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAmortizedcostofloansbyriskcategorybyvintageyearDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_7fe9ba22-ed58-4c7a-85d1-b2b7b1bd1ef8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_7fe9ba22-ed58-4c7a-85d1-b2b7b1bd1ef8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_3bc4ed6a-ab0f-4337-84c6-819ec856c0a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_3bc4ed6a-ab0f-4337-84c6-819ec856c0a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_0dbfb86d-037a-417a-a93a-1b9f28f5bb21" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_0dbfb86d-037a-417a-a93a-1b9f28f5bb21" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_1b25c199-6451-4036-9e1d-fe2cd8591583" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_1b25c199-6451-4036-9e1d-fe2cd8591583" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_c1f1160a-1704-4e15-93ff-a0002dfd929e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_c1f1160a-1704-4e15-93ff-a0002dfd929e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_67c2aa9b-f051-41b1-86d4-f0413cb59ae2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_67c2aa9b-f051-41b1-86d4-f0413cb59ae2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRevolving_371877ff-0a43-4dc4-95db-1f1327a6c141" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRevolving"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableRevolving_371877ff-0a43-4dc4-95db-1f1327a6c141" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRevolvingConvertedToTermLoan_46761fec-e63e-4df9-ae8f-fd54dbc021ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRevolvingConvertedToTermLoan"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_820e0894-5c1a-4f59-b180-27358b7403d0" xlink:to="loc_us-gaap_FinancingReceivableRevolvingConvertedToTermLoan_46761fec-e63e-4df9-ae8f-fd54dbc021ce" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRiskcategoryofloansbyclassofloansDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesRiskcategoryofloansbyclassofloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRiskcategoryofloansbyclassofloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesChangesinthevalueoftheaccretableyieldforPCIloansDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesChangesinthevalueoftheaccretableyieldforPCIloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesChangesinthevalueoftheaccretableyieldforPCIloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansmodifiedundertermsofTDRDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesLoansmodifiedundertermsofTDRDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansmodifiedundertermsofTDRDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesBalanceandactivityintheACLbyportfoliosegmentDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesBalanceandactivityintheACLbyportfoliosegmentDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesBalanceandactivityintheACLbyportfoliosegmentDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinloansbyportfoliosegmentandthebalanceoftheACLDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinloansbyportfoliosegmentandthebalanceoftheACLDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinloansbyportfoliosegmentandthebalanceoftheACLDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_a98b7416-d706-4134-a636-09a4ff0c4472" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_3a3bd625-9d66-43ad-97f2-1d4defba3a3c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_a98b7416-d706-4134-a636-09a4ff0c4472" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_3a3bd625-9d66-43ad-97f2-1d4defba3a3c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_b049fb53-16c8-439c-a551-2874cb2617a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_a98b7416-d706-4134-a636-09a4ff0c4472" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_b049fb53-16c8-439c-a551-2874cb2617a0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses_fd6793c4-295a-4b55-aca1-d58392fcac91" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_a98b7416-d706-4134-a636-09a4ff0c4472" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses_fd6793c4-295a-4b55-aca1-d58392fcac91" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_1bd0240d-6021-4018-8990-aadafe026456" xlink:href="ucbi-20201231.xsd#ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment_8475079f-af57-40e4-a672-7833c8381790" xlink:href="ucbi-20201231.xsd#ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_1bd0240d-6021-4018-8990-aadafe026456" xlink:to="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment_8475079f-af57-40e4-a672-7833c8381790" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment_4c9f4fe5-16ea-4995-b69c-06b7fc2316b7" xlink:href="ucbi-20201231.xsd#ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_1bd0240d-6021-4018-8990-aadafe026456" xlink:to="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment_4c9f4fe5-16ea-4995-b69c-06b7fc2316b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityPCI_3f71b02a-b91c-4492-aa32-af4b0cadee2f" xlink:href="ucbi-20201231.xsd#ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityPCI"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_1bd0240d-6021-4018-8990-aadafe026456" xlink:to="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityPCI_3f71b02a-b91c-4492-aa32-af4b0cadee2f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_06fc00cd-b998-4ab8-b3b7-232c33b62dbb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_078eeaf8-d6fc-4cde-952c-987294c31910" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_06fc00cd-b998-4ab8-b3b7-232c33b62dbb" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_078eeaf8-d6fc-4cde-952c-987294c31910" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_f00d3033-9cbf-4fcc-b9a6-14709c2c38d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_06fc00cd-b998-4ab8-b3b7-232c33b62dbb" xlink:to="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_f00d3033-9cbf-4fcc-b9a6-14709c2c38d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_8c139a2f-795a-45e9-910a-c2aac9864e7e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_06fc00cd-b998-4ab8-b3b7-232c33b62dbb" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_8c139a2f-795a-45e9-910a-c2aac9864e7e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiability_c77bc730-3a9f-4cbf-8a50-685bcc7f3b58" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OffBalanceSheetCreditLossLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OffBalanceSheetLiabilityCreditLossLiabilityIndividuallyEvaluatedForImpairment_c257c257-b09c-445e-9c47-24bfbcb1aad4" xlink:href="ucbi-20201231.xsd#ucbi_OffBalanceSheetLiabilityCreditLossLiabilityIndividuallyEvaluatedForImpairment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OffBalanceSheetCreditLossLiability_c77bc730-3a9f-4cbf-8a50-685bcc7f3b58" xlink:to="loc_ucbi_OffBalanceSheetLiabilityCreditLossLiabilityIndividuallyEvaluatedForImpairment_c257c257-b09c-445e-9c47-24bfbcb1aad4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OffBalanceSheetLiabilityCreditLossLiabilityCollectivelyEvaluatedForImpairment_7b49f244-b24d-459e-8846-eaf6c77a2b64" xlink:href="ucbi-20201231.xsd#ucbi_OffBalanceSheetLiabilityCreditLossLiabilityCollectivelyEvaluatedForImpairment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OffBalanceSheetCreditLossLiability_c77bc730-3a9f-4cbf-8a50-685bcc7f3b58" xlink:to="loc_ucbi_OffBalanceSheetLiabilityCreditLossLiabilityCollectivelyEvaluatedForImpairment_7b49f244-b24d-459e-8846-eaf6c77a2b64" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansindividuallyevaluatedforimpairmentbyclassofloansDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesLoansindividuallyevaluatedforimpairmentbyclassofloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansindividuallyevaluatedforimpairmentbyclassofloansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_055721fe-1142-41c8-9d30-ba8579fd48ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_94bae088-c13f-44c8-b571-2e76a63e9d88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_055721fe-1142-41c8-9d30-ba8579fd48ab" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_94bae088-c13f-44c8-b571-2e76a63e9d88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_aecec608-b8b3-4849-9daa-44bf8c4d2da1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_055721fe-1142-41c8-9d30-ba8579fd48ab" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_aecec608-b8b3-4849-9daa-44bf8c4d2da1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_993a30ae-7166-4e2d-a9aa-ea5afa7e588c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_9155ab9a-22ee-488d-b079-a7e726d0edc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_993a30ae-7166-4e2d-a9aa-ea5afa7e588c" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_9155ab9a-22ee-488d-b079-a7e726d0edc0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_1beee810-72e9-48f6-b6f2-26c741b3ffbd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_993a30ae-7166-4e2d-a9aa-ea5afa7e588c" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_1beee810-72e9-48f6-b6f2-26c741b3ffbd" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAveragebalancesofimpairedloansandincomerecognizedonimpairedloansDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LoansandLeasesandAllowanceforCreditLossesAveragebalancesofimpairedloansandincomerecognizedonimpairedloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAveragebalancesofimpairedloansandincomerecognizedonimpairedloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/PremisesandEquipment" xlink:type="simple" xlink:href="ucbi-20201231.xsd#PremisesandEquipment"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/PremisesandEquipment" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/PremisesandEquipmentTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#PremisesandEquipmentTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/PremisesandEquipmentTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/PremisesandEquipmentSummaryDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#PremisesandEquipmentSummaryDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/PremisesandEquipmentSummaryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_5afb4ab9-3c8f-4821-9b69-8221db3739a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_6a8e2ec4-23f1-42b2-8cf3-58c3e5f16490" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_5afb4ab9-3c8f-4821-9b69-8221db3739a0" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_6a8e2ec4-23f1-42b2-8cf3-58c3e5f16490" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_b87a27b6-b810-48c5-be43-9d00746f48f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_5afb4ab9-3c8f-4821-9b69-8221db3739a0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_b87a27b6-b810-48c5-be43-9d00746f48f7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/PremisesandEquipmentNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#PremisesandEquipmentNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/PremisesandEquipmentNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivities" xlink:type="simple" xlink:href="ucbi-20201231.xsd#DerivativesandHedgingActivities"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivities" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#DerivativesandHedgingActivitiesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivitiesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesFairvalueofderivativefinancialinstrumentsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#DerivativesandHedgingActivitiesFairvalueofderivativefinancialinstrumentsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivitiesFairvalueofderivativefinancialinstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_a2ddc144-778e-48e8-b5db-eca3a2ef656c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_6deb2ebf-b30d-4996-aaac-d42fba2e02a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_a2ddc144-778e-48e8-b5db-eca3a2ef656c" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_6deb2ebf-b30d-4996-aaac-d42fba2e02a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_86f39a59-6e21-4649-bf4a-698aeb74b969" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_a2ddc144-778e-48e8-b5db-eca3a2ef656c" xlink:to="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_86f39a59-6e21-4649-bf4a-698aeb74b969" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueOfCollateral_3ac26cf5-eb4b-4a15-bffb-a51cd673f941" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetFairValueOfCollateral"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_a2ddc144-778e-48e8-b5db-eca3a2ef656c" xlink:to="loc_us-gaap_DerivativeAssetFairValueOfCollateral_3ac26cf5-eb4b-4a15-bffb-a51cd673f941" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2c79a064-399f-49c7-9a35-380344441092" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_54ba5348-a48e-485e-b10e-d620c1cece53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2c79a064-399f-49c7-9a35-380344441092" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_54ba5348-a48e-485e-b10e-d620c1cece53" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_300ee940-b73f-4bce-9044-d9831ffb0cd6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2c79a064-399f-49c7-9a35-380344441092" xlink:to="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_300ee940-b73f-4bce-9044-d9831ffb0cd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_d816cc35-4dba-4ea3-acc8-784fc3b47b97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOfCollateral"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2c79a064-399f-49c7-9a35-380344441092" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_d816cc35-4dba-4ea3-acc8-784fc3b47b97" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#DerivativesandHedgingActivitiesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivitiesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesEffectofderivativesinhedgingrelationshipsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#DerivativesandHedgingActivitiesEffectofderivativesinhedgingrelationshipsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivitiesEffectofderivativesinhedgingrelationshipsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_b6ec0b92-c7ce-4acb-85d5-04c526e0e8cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_a6c73b90-599c-4273-995c-297d46b00401" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_b6ec0b92-c7ce-4acb-85d5-04c526e0e8cb" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_a6c73b90-599c-4273-995c-297d46b00401" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_GainLossOnDerivativeInterestSettlement_4cbc2d3a-7716-452c-b9f6-1eda50a09490" xlink:href="ucbi-20201231.xsd#ucbi_GainLossOnDerivativeInterestSettlement"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_b6ec0b92-c7ce-4acb-85d5-04c526e0e8cb" xlink:to="loc_ucbi_GainLossOnDerivativeInterestSettlement_4cbc2d3a-7716-452c-b9f6-1eda50a09490" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_1ff72752-3ec3-4590-829d-cfa13f42db22" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_b6ec0b92-c7ce-4acb-85d5-04c526e0e8cb" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_1ff72752-3ec3-4590-829d-cfa13f42db22" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_GainLossOnCashFlowHedgesRecognizedInEarnings_95d09840-eece-42fc-a113-66602d6fd2c0" xlink:href="ucbi-20201231.xsd#ucbi_GainLossOnCashFlowHedgesRecognizedInEarnings"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_b2b13d6e-f043-4255-ba38-4d4f47ca9825" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_GainLossOnCashFlowHedgesRecognizedInEarnings_95d09840-eece-42fc-a113-66602d6fd2c0" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_b2b13d6e-f043-4255-ba38-4d4f47ca9825" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesCarryingamountandhedgeaccountingbasisadjustmentDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#DerivativesandHedgingActivitiesCarryingamountandhedgeaccountingbasisadjustmentDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivitiesCarryingamountandhedgeaccountingbasisadjustmentDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesGainsandlossesrecognizedinincomeonderivativesnotdesignatedashedginginstrumentsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#DerivativesandHedgingActivitiesGainsandlossesrecognizedinincomeonderivativesnotdesignatedashedginginstrumentsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivitiesGainsandlossesrecognizedinincomeonderivativesnotdesignatedashedginginstrumentsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssets" xlink:type="simple" xlink:href="ucbi-20201231.xsd#GoodwillandOtherIntangibleAssets"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssets" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#GoodwillandOtherIntangibleAssetsTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsSummaryDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#GoodwillandOtherIntangibleAssetsSummaryDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsSummaryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_305c2120-f806-45d9-83c8-a755d4b2d503" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_70deee70-4c31-44b2-9f41-00a36f62b761" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_305c2120-f806-45d9-83c8-a755d4b2d503" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_70deee70-4c31-44b2-9f41-00a36f62b761" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_6ee17f6e-e339-413e-aae3-d15d7b8848ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_305c2120-f806-45d9-83c8-a755d4b2d503" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_6ee17f6e-e339-413e-aae3-d15d7b8848ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_05e9a92a-bee0-43a2-bdc4-53d31db5fc89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_07c467c0-e59c-498a-88e8-21698f453078" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_05e9a92a-bee0-43a2-bdc4-53d31db5fc89" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_07c467c0-e59c-498a-88e8-21698f453078" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_2b341eca-a123-4551-85f7-7608bc97f6ec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_05e9a92a-bee0-43a2-bdc4-53d31db5fc89" xlink:to="loc_us-gaap_Goodwill_2b341eca-a123-4551-85f7-7608bc97f6ec" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsChangesincarryingamountofgoodwillDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#GoodwillandOtherIntangibleAssetsChangesincarryingamountofgoodwillDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsChangesincarryingamountofgoodwillDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsEstimatedaggregateamortizationexpenseforfutureperiodsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#GoodwillandOtherIntangibleAssetsEstimatedaggregateamortizationexpenseforfutureperiodsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsEstimatedaggregateamortizationexpenseforfutureperiodsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_48a7c2b2-34a2-4ba4-aa06-ec1d8d6bdc7d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_9312dbf2-562d-4a36-ae6e-d2127e0fb314" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_48a7c2b2-34a2-4ba4-aa06-ec1d8d6bdc7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_9312dbf2-562d-4a36-ae6e-d2127e0fb314" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e664a181-758c-46e8-a823-153863d89f18" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_48a7c2b2-34a2-4ba4-aa06-ec1d8d6bdc7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e664a181-758c-46e8-a823-153863d89f18" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4c76db9d-4c68-4d9b-a0fa-f0dbd3dc1f1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_48a7c2b2-34a2-4ba4-aa06-ec1d8d6bdc7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4c76db9d-4c68-4d9b-a0fa-f0dbd3dc1f1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_acd17ebe-b04c-4be9-8242-400b2e0ffb69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_48a7c2b2-34a2-4ba4-aa06-ec1d8d6bdc7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_acd17ebe-b04c-4be9-8242-400b2e0ffb69" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_85891cb4-5ead-421c-8f32-d2e0679ec78a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_48a7c2b2-34a2-4ba4-aa06-ec1d8d6bdc7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_85891cb4-5ead-421c-8f32-d2e0679ec78a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_be62d78b-62be-4b97-9dd8-9353e0a2d5d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_48a7c2b2-34a2-4ba4-aa06-ec1d8d6bdc7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_be62d78b-62be-4b97-9dd8-9353e0a2d5d4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ServicingAssetsandLiabilities" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ServicingAssetsandLiabilities"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ServicingAssetsandLiabilities" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ServicingAssetsandLiabilitiesTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ServicingAssetsandLiabilitiesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ServicingAssetsandLiabilitiesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ServicingAssetsandLiabilitiesChangesinSBAUSDAloansservicingrightsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ServicingAssetsandLiabilitiesChangesinSBAUSDAloansservicingrightsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ServicingAssetsandLiabilitiesChangesinSBAUSDAloansservicingrightsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ServicingAssetsandLiabilitiesKeycharacteristicsinputsandeconomicassumptionsforSBAUSDAloansandrelatedsensitivityDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ServicingAssetsandLiabilitiesKeycharacteristicsinputsandeconomicassumptionsforSBAUSDAloansandrelatedsensitivityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ServicingAssetsandLiabilitiesKeycharacteristicsinputsandeconomicassumptionsforSBAUSDAloansandrelatedsensitivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ServicingAssetsandLiabilitiesChangesinresidentialmortgageloansservicingrightsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ServicingAssetsandLiabilitiesChangesinresidentialmortgageloansservicingrightsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ServicingAssetsandLiabilitiesChangesinresidentialmortgageloansservicingrightsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ServicingAssetsandLiabilitiesKeycharacteristicsinputsandeconomicassumptionsforresidentialmortgageloansandrelatedsensitivityDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ServicingAssetsandLiabilitiesKeycharacteristicsinputsandeconomicassumptionsforresidentialmortgageloansandrelatedsensitivityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ServicingAssetsandLiabilitiesKeycharacteristicsinputsandeconomicassumptionsforresidentialmortgageloansandrelatedsensitivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ServicingAssetsandLiabilitiesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ServicingAssetsandLiabilitiesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ServicingAssetsandLiabilitiesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/TimeDeposits" xlink:type="simple" xlink:href="ucbi-20201231.xsd#TimeDeposits"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/TimeDeposits" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/TimeDepositsTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#TimeDepositsTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/TimeDepositsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/TimeDepositsContractualmaturitiesoftimedepositsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#TimeDepositsContractualmaturitiesoftimedepositsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/TimeDepositsContractualmaturitiesoftimedepositsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDeposits_206fc5d6-371a-47b7-8e8e-6e6052951843" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimeDeposits"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDepositMaturitiesYearOne_8b3be283-d1c6-464c-bf5e-4d58531fe975" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimeDepositMaturitiesYearOne"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_TimeDeposits_206fc5d6-371a-47b7-8e8e-6e6052951843" xlink:to="loc_us-gaap_TimeDepositMaturitiesYearOne_8b3be283-d1c6-464c-bf5e-4d58531fe975" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDepositMaturitiesYearTwo_d2977fc9-20ac-44ad-896c-163d976c1ef3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimeDepositMaturitiesYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_TimeDeposits_206fc5d6-371a-47b7-8e8e-6e6052951843" xlink:to="loc_us-gaap_TimeDepositMaturitiesYearTwo_d2977fc9-20ac-44ad-896c-163d976c1ef3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDepositMaturitiesYearThree_fb752cb8-751e-4559-a8c4-d6ab271b7ff2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimeDepositMaturitiesYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_TimeDeposits_206fc5d6-371a-47b7-8e8e-6e6052951843" xlink:to="loc_us-gaap_TimeDepositMaturitiesYearThree_fb752cb8-751e-4559-a8c4-d6ab271b7ff2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDepositMaturitiesYearFour_d483021b-7b3f-44e0-af29-7fea76e86aaf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimeDepositMaturitiesYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_TimeDeposits_206fc5d6-371a-47b7-8e8e-6e6052951843" xlink:to="loc_us-gaap_TimeDepositMaturitiesYearFour_d483021b-7b3f-44e0-af29-7fea76e86aaf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDepositMaturitiesYearFive_f06a2389-142b-4c59-961c-62afa9aa538d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimeDepositMaturitiesYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_TimeDeposits_206fc5d6-371a-47b7-8e8e-6e6052951843" xlink:to="loc_us-gaap_TimeDepositMaturitiesYearFive_f06a2389-142b-4c59-961c-62afa9aa538d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDepositMaturitiesAfterYearFive_7556be06-840e-4ea1-9ed0-79b360a1ba19" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimeDepositMaturitiesAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_TimeDeposits_206fc5d6-371a-47b7-8e8e-6e6052951843" xlink:to="loc_us-gaap_TimeDepositMaturitiesAfterYearFive_7556be06-840e-4ea1-9ed0-79b360a1ba19" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/TimeDepositsNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#TimeDepositsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/TimeDepositsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LongtermDebt" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LongtermDebt"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LongtermDebt" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LongtermDebtTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LongtermDebtTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LongtermDebtTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LongtermDebtScheduleoflongtermdebtDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#LongtermDebtScheduleoflongtermdebtDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LongtermDebtScheduleoflongtermdebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_09cf10a4-d43b-457d-925a-079307c1caed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_3b26a7fb-8da5-49d0-a9b0-c731089e3b23" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_09cf10a4-d43b-457d-925a-079307c1caed" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_3b26a7fb-8da5-49d0-a9b0-c731089e3b23" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_5fb9710c-a237-4fb3-8d23-7b86a5a84b1b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_09cf10a4-d43b-457d-925a-079307c1caed" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_5fb9710c-a237-4fb3-8d23-7b86a5a84b1b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeases" xlink:type="simple" xlink:href="ucbi-20201231.xsd#OperatingLeases"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeases" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#OperatingLeasesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesRightofuseassetandoperatingleaseliabilityDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#OperatingLeasesRightofuseassetandoperatingleaseliabilityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesRightofuseassetandoperatingleaseliabilityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#OperatingLeasesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesOperatingleaseincomeandexpenseandothersupplementalinformationDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#OperatingLeasesOperatingleaseincomeandexpenseandothersupplementalinformationDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesOperatingleaseincomeandexpenseandothersupplementalinformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_ee721140-cc9e-49f8-b513-e4158e9a55e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_f61f78fe-6ce1-438a-9c5f-5e1f2c167172" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_ee721140-cc9e-49f8-b513-e4158e9a55e6" xlink:to="loc_us-gaap_OperatingLeaseCost_f61f78fe-6ce1-438a-9c5f-5e1f2c167172" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_49e379fb-7ab1-44ba-9360-106b2022d4f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_ee721140-cc9e-49f8-b513-e4158e9a55e6" xlink:to="loc_us-gaap_VariableLeaseCost_49e379fb-7ab1-44ba-9360-106b2022d4f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_52d29ddd-ba47-4a6e-b3d9-6a30126fa090" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_ee721140-cc9e-49f8-b513-e4158e9a55e6" xlink:to="loc_us-gaap_ShortTermLeaseCost_52d29ddd-ba47-4a6e-b3d9-6a30126fa090" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesFutureminimumleasepaymentsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#OperatingLeasesFutureminimumleasepaymentsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesFutureminimumleasepaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_03190489-e7c5-4c8b-8b28-031e61bec1df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_5ab495a6-1362-49d5-84b6-0e0a6bf1e114" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_03190489-e7c5-4c8b-8b28-031e61bec1df" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_5ab495a6-1362-49d5-84b6-0e0a6bf1e114" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_3d5d9e9f-4934-41fe-a0bd-e07b4804fe34" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_03190489-e7c5-4c8b-8b28-031e61bec1df" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_3d5d9e9f-4934-41fe-a0bd-e07b4804fe34" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_a57685df-d863-4382-a0ee-623099be0fb6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_03190489-e7c5-4c8b-8b28-031e61bec1df" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_a57685df-d863-4382-a0ee-623099be0fb6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_e8a13019-e93b-469c-9bc1-83aa9d900255" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_03190489-e7c5-4c8b-8b28-031e61bec1df" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_e8a13019-e93b-469c-9bc1-83aa9d900255" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_15bde637-b8a7-46b1-8600-9a0dcbac560c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_03190489-e7c5-4c8b-8b28-031e61bec1df" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_15bde637-b8a7-46b1-8600-9a0dcbac560c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_87e09215-475f-4328-94d1-0c437a6a3246" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_03190489-e7c5-4c8b-8b28-031e61bec1df" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_87e09215-475f-4328-94d1-0c437a6a3246" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesFutureminimumleasepaymentsDetails_1" xlink:type="simple" xlink:href="ucbi-20201231.xsd#OperatingLeasesFutureminimumleasepaymentsDetails_1"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesFutureminimumleasepaymentsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_642205f1-9319-46ec-a9de-0419bcc891d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_5ecb5f84-bd2b-419f-b981-e9e13e6908d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_642205f1-9319-46ec-a9de-0419bcc891d5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_5ecb5f84-bd2b-419f-b981-e9e13e6908d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_a5c2a66a-156b-4ce6-a5ce-528dde2c5f4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_642205f1-9319-46ec-a9de-0419bcc891d5" xlink:to="loc_us-gaap_OperatingLeaseLiability_a5c2a66a-156b-4ce6-a5ce-528dde2c5f4a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurements"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurements" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsAssetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsAssetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsAssetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_bb503902-6049-4e61-8b86-05569d5b87b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_4f190434-5051-45ad-86e1-f387b1200e0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_bb503902-6049-4e61-8b86-05569d5b87b1" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_4f190434-5051-45ad-86e1-f387b1200e0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_d8c1b470-e663-4cab-a895-cc748427e4f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_bb503902-6049-4e61-8b86-05569d5b87b1" xlink:to="loc_us-gaap_DerivativeLiabilities_d8c1b470-e663-4cab-a895-cc748427e4f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_b4325a38-0148-409a-a687-7b1473491607" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_b4325a38-0148-409a-a687-7b1473491607" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_db7287b6-9637-4e3b-9a52-d1603ef288d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_db7287b6-9637-4e3b-9a52-d1603ef288d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_24035304-8b71-486a-b70e-cf5b5d0da853" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_24035304-8b71-486a-b70e-cf5b5d0da853" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_bfdc34a3-5a4a-4bfe-89c1-31122974cc95" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationPlanAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_bfdc34a3-5a4a-4bfe-89c1-31122974cc95" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_e828554d-cd6f-4055-a807-1dbf1b84072b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_e828554d-cd6f-4055-a807-1dbf1b84072b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ResidentialMortgageServicingAssetAtFairValueAmount_8b2b0a5b-a055-4e42-b862-bd54840c2073" xlink:href="ucbi-20201231.xsd#ucbi_ResidentialMortgageServicingAssetAtFairValueAmount"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:to="loc_ucbi_ResidentialMortgageServicingAssetAtFairValueAmount_8b2b0a5b-a055-4e42-b862-bd54840c2073" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_e2665bd9-6272-4a58-87c3-51083b71c1ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dbe27481-ece8-4995-a01d-60c989c64598" xlink:to="loc_us-gaap_DerivativeAssets_e2665bd9-6272-4a58-87c3-51083b71c1ad" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsReconciliationformeasurementsatfairvalueonarecurringbasisusingsignificantunobservableinputsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsReconciliationformeasurementsatfairvalueonarecurringbasisusingsignificantunobservableinputsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsReconciliationformeasurementsatfairvalueonarecurringbasisusingsignificantunobservableinputsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsQuantitativeinformationaboutLevel3measurementsforfairvalueonarecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsQuantitativeinformationaboutLevel3measurementsforfairvalueonarecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsQuantitativeinformationaboutLevel3measurementsforfairvalueonarecurringbasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsFairvalueoptionDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsFairvalueoptionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsFairvalueoptionDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsAssetsandliabilitiesmeasuredatfairvalueonnonrecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsAssetsandliabilitiesmeasuredatfairvalueonnonrecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsAssetsandliabilitiesmeasuredatfairvalueonnonrecurringbasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsFairvaluesforotherfinancialinstrumentsthatarenotmeasuredatfairvalueonrecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsFairvaluesforotherfinancialinstrumentsthatarenotmeasuredatfairvalueonrecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsFairvaluesforotherfinancialinstrumentsthatarenotmeasuredatfairvalueonrecurringbasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommonandPreferredStock" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CommonandPreferredStock"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommonandPreferredStock" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommonandPreferredStockDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CommonandPreferredStockDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommonandPreferredStockDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EquityCompensationPlans" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EquityCompensationPlans"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EquityCompensationPlans" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EquityCompensationPlansTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EquityCompensationPlansTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EquityCompensationPlansTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EquityCompensationPlansRestrictedstockunitsandoptionsoutstandingactivityDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EquityCompensationPlansRestrictedstockunitsandoptionsoutstandingactivityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EquityCompensationPlansRestrictedstockunitsandoptionsoutstandingactivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EquityCompensationPlansNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EquityCompensationPlansNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EquityCompensationPlansNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutofAOCI" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ReclassificationsOutofAOCI"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutofAOCI" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutofAOCITables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ReclassificationsOutofAOCITables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutofAOCITables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutofAOCIDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#ReclassificationsOutofAOCIDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutofAOCIDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShare" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EarningsPerShare"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShare" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShareTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EarningsPerShareTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShareTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShareComputationofbasicanddilutedearningspershareDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EarningsPerShareComputationofbasicanddilutedearningspershareDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShareComputationofbasicanddilutedearningspershareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_f91373a3-b299-4b36-85fe-b3a81215ec48" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_760abc90-a09d-4f85-ae74-1b7e0065e599" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_f91373a3-b299-4b36-85fe-b3a81215ec48" xlink:to="loc_us-gaap_NetIncomeLoss_760abc90-a09d-4f85-ae74-1b7e0065e599" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_fd12567d-a51c-4e9a-b0b1-a3bf42db4961" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_f91373a3-b299-4b36-85fe-b3a81215ec48" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_fd12567d-a51c-4e9a-b0b1-a3bf42db4961" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_b47ace20-ba20-4149-9c16-32f14f81b5f5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_f91373a3-b299-4b36-85fe-b3a81215ec48" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_b47ace20-ba20-4149-9c16-32f14f81b5f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_47cb9c34-bd0f-4571-83f8-4c6c76ecdfc4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_e4e8119e-394e-49ae-83b2-42b59f6394d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_47cb9c34-bd0f-4571-83f8-4c6c76ecdfc4" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_e4e8119e-394e-49ae-83b2-42b59f6394d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_41516c1a-6e95-401e-b6d7-fba28c6901f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_47cb9c34-bd0f-4571-83f8-4c6c76ecdfc4" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_41516c1a-6e95-401e-b6d7-fba28c6901f7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShareNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#EarningsPerShareNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxes" xlink:type="simple" xlink:href="ucbi-20201231.xsd#IncomeTaxes"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxes" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#IncomeTaxesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxesIncometaxexpenseDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#IncomeTaxesIncometaxexpenseDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxesIncometaxexpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_62411e86-ce93-410b-b97d-1a83c5e97f48" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_b2b0ccf2-3d18-4002-b124-e91b29471df4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_62411e86-ce93-410b-b97d-1a83c5e97f48" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_b2b0ccf2-3d18-4002-b124-e91b29471df4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredOtherTaxExpenseBenefit_e4286a5b-5f31-4d9b-b2ff-f2b580e2c1cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredOtherTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_62411e86-ce93-410b-b97d-1a83c5e97f48" xlink:to="loc_us-gaap_DeferredOtherTaxExpenseBenefit_e4286a5b-5f31-4d9b-b2ff-f2b580e2c1cf" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxesDifferencesbetweenprovisionforincometaxesandamountcomputedasstatutoryrateDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#IncomeTaxesDifferencesbetweenprovisionforincometaxesandamountcomputedasstatutoryrateDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxesDifferencesbetweenprovisionforincometaxesandamountcomputedasstatutoryrateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_beb3e679-c490-40e1-9dd1-e830c9bca3a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_beb3e679-c490-40e1-9dd1-e830c9bca3a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_e6b52c1f-16c1-4d6c-ad07-ccc5fa44f831" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_e6b52c1f-16c1-4d6c-ad07-ccc5fa44f831" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_IncomeTaxReconciliationBankOwnedLifeInsuranceEarnings_e6494fbf-1363-4883-a563-2d7e801f1787" xlink:href="ucbi-20201231.xsd#ucbi_IncomeTaxReconciliationBankOwnedLifeInsuranceEarnings"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_ucbi_IncomeTaxReconciliationBankOwnedLifeInsuranceEarnings_e6494fbf-1363-4883-a563-2d7e801f1787" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_IncomeTaxReconciliationChangeInReservesForUncertainTaxPositions_5cf8db0f-938b-4a9d-8013-27f9097f3150" xlink:href="ucbi-20201231.xsd#ucbi_IncomeTaxReconciliationChangeInReservesForUncertainTaxPositions"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_ucbi_IncomeTaxReconciliationChangeInReservesForUncertainTaxPositions_5cf8db0f-938b-4a9d-8013-27f9097f3150" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxExemptIncome_f224682e-909e-403e-92cd-8ef002ac0a37" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxExemptIncome"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxExemptIncome_f224682e-909e-403e-92cd-8ef002ac0a37" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_7d84195a-413c-48a2-8365-a80bd4465dc7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_7d84195a-413c-48a2-8365-a80bd4465dc7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_IncomeTaxReconciliationTaxTransactionCosts_7a089693-9df6-4257-8428-3caac3591e36" xlink:href="ucbi-20201231.xsd#ucbi_IncomeTaxReconciliationTaxTransactionCosts"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_ucbi_IncomeTaxReconciliationTaxTransactionCosts_7a089693-9df6-4257-8428-3caac3591e36" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCredits_9a38cc2a-8678-4e6a-8534-05f3d74af744" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxCredits"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCredits_9a38cc2a-8678-4e6a-8534-05f3d74af744" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_d6bdb977-74b1-491c-9e44-ab1cd47bab7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_d6bdb977-74b1-491c-9e44-ab1cd47bab7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherReconcilingItems_8937829b-d2a9-4ccf-836b-77c6696f6663" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherReconcilingItems"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_177ba2d7-6f4f-44a3-b6ba-2291a7deccff" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherReconcilingItems_8937829b-d2a9-4ccf-836b-77c6696f6663" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxesDeferredtaxesDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#IncomeTaxesDeferredtaxesDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxesDeferredtaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses_5209adba-fc56-45d7-902c-dfa17edbd5ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses_5209adba-fc56-45d7-902c-dfa17edbd5ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_7716670d-3157-4f70-945f-a23b56a3f5eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_7716670d-3157-4f70-945f-a23b56a3f5eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits_fc339744-adb0-4041-b09e-034b1856d6d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits_fc339744-adb0-4041-b09e-034b1856d6d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxAssetsLoanPurchaseAccountingAdjustment_c0cfb290-f408-4922-9aa0-ac7f599e0e71" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxAssetsLoanPurchaseAccountingAdjustment"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_ucbi_DeferredTaxAssetsLoanPurchaseAccountingAdjustment_c0cfb290-f408-4922-9aa0-ac7f599e0e71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxAssetsReserveForLossesOnForeclosedProperties_8023678a-e627-4451-aac2-6a013867bb84" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxAssetsReserveForLossesOnForeclosedProperties"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_ucbi_DeferredTaxAssetsReserveForLossesOnForeclosedProperties_8023678a-e627-4451-aac2-6a013867bb84" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_e357bdea-2d4a-4da7-b7c3-01c4c8cd2d1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_e357bdea-2d4a-4da7-b7c3-01c4c8cd2d1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_4e6655b6-a38a-4df3-848d-3bd0915278aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_4e6655b6-a38a-4df3-848d-3bd0915278aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsInvestments_59b2bbaa-899e-4eb5-a921-0854f254ef70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsInvestments"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsInvestments_59b2bbaa-899e-4eb5-a921-0854f254ef70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_6f846263-819e-487a-8ccb-372d5bbbadc3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_6f846263-819e-487a-8ccb-372d5bbbadc3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxAssetsSecuritiesPurchaseAccountingAdjustments_b557b9e3-9d1a-4985-81ef-5a7d9115bb0a" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxAssetsSecuritiesPurchaseAccountingAdjustments"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_ucbi_DeferredTaxAssetsSecuritiesPurchaseAccountingAdjustments_b557b9e3-9d1a-4985-81ef-5a7d9115bb0a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxAssetsLeaseLiability_990fc120-856d-4ad6-856b-3c06abdf1c5b" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxAssetsLeaseLiability"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_ucbi_DeferredTaxAssetsLeaseLiability_990fc120-856d-4ad6-856b-3c06abdf1c5b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_9bd04741-94e3-440c-9db5-55ae43ccfd7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_15c07a74-e362-4759-a608-6d0b2917f26f" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_9bd04741-94e3-440c-9db5-55ae43ccfd7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxLiabilitiesUnrealizedGainsOnSecuritiesAvailableForSale_1cce2d70-7c94-4e8b-a891-c924e855f457" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxLiabilitiesUnrealizedGainsOnSecuritiesAvailableForSale"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_ucbi_DeferredTaxLiabilitiesUnrealizedGainsOnSecuritiesAvailableForSale_1cce2d70-7c94-4e8b-a891-c924e855f457" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxLiabilitiesUnrealizedGainOnCashFlowHedge_fdf69767-402e-4aa4-be06-b05e36012234" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxLiabilitiesUnrealizedGainOnCashFlowHedge"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_ucbi_DeferredTaxLiabilitiesUnrealizedGainOnCashFlowHedge_fdf69767-402e-4aa4-be06-b05e36012234" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_3b403c1d-c2bd-4843-86bf-3b4f947d4954" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_3b403c1d-c2bd-4843-86bf-3b4f947d4954" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_bee26d4f-8dd9-4244-9f4a-684b947f8f4e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_bee26d4f-8dd9-4244-9f4a-684b947f8f4e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts_cfa5afe7-e3d5-4ab5-8f34-5cd057296b05" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts_cfa5afe7-e3d5-4ab5-8f34-5cd057296b05" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_1d48de17-35ba-428a-a657-b1436edd9901" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesLeasingArrangements"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_1d48de17-35ba-428a-a657-b1436edd9901" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_e1418dc4-40ee-4b11-a591-bedab83102a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPrepaidExpenses"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_e1418dc4-40ee-4b11-a591-bedab83102a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesMortgageServicingRights_18ee3f96-a8ff-47ee-ba55-317ab90ecfd5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesMortgageServicingRights"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesMortgageServicingRights_18ee3f96-a8ff-47ee-ba55-317ab90ecfd5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDerivatives_5227fdb2-4f14-42af-b397-07b1915f71e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesDerivatives"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDerivatives_5227fdb2-4f14-42af-b397-07b1915f71e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxLiabilitiesRightOfUseAssets_32379651-ca32-4006-a952-a3b43107fe57" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxLiabilitiesRightOfUseAssets"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_ucbi_DeferredTaxLiabilitiesRightOfUseAssets_32379651-ca32-4006-a952-a3b43107fe57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxLiabilitiesSecuritiesPurchaseAccountingAdjustments_d51815ab-6eb1-4acc-b148-f57bb67c7aa1" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxLiabilitiesSecuritiesPurchaseAccountingAdjustments"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_ucbi_DeferredTaxLiabilitiesSecuritiesPurchaseAccountingAdjustments_d51815ab-6eb1-4acc-b148-f57bb67c7aa1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DeferredTaxLiabilityUncertainTaxPositions_82624944-e52b-41d3-8ad5-89da9138bb44" xlink:href="ucbi-20201231.xsd#ucbi_DeferredTaxLiabilityUncertainTaxPositions"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_8ba104ce-02d0-4448-80d7-c79d1554485e" xlink:to="loc_ucbi_DeferredTaxLiabilityUncertainTaxPositions_82624944-e52b-41d3-8ad5-89da9138bb44" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_0b80ec03-fca0-4aa8-a581-5f6a61f48b10" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_9e66ee0b-b180-4576-8a73-84db09fd3a20" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_0b80ec03-fca0-4aa8-a581-5f6a61f48b10" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_9e66ee0b-b180-4576-8a73-84db09fd3a20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_e6194e30-af64-4b41-9aeb-1e91b24ebdb2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_0b80ec03-fca0-4aa8-a581-5f6a61f48b10" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_e6194e30-af64-4b41-9aeb-1e91b24ebdb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_ae41f47a-f3fe-4a7b-9b52-97ddc51006e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_0b80ec03-fca0-4aa8-a581-5f6a61f48b10" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_ae41f47a-f3fe-4a7b-9b52-97ddc51006e4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxesReconciliationofunrecognizedtaxbenefitsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#IncomeTaxesReconciliationofunrecognizedtaxbenefitsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxesReconciliationofunrecognizedtaxbenefitsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/BenefitPlans" xlink:type="simple" xlink:href="ucbi-20201231.xsd#BenefitPlans"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/BenefitPlans" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/BenefitPlansTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#BenefitPlansTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/BenefitPlansTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/BenefitPlansNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#BenefitPlansNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/BenefitPlansNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/BenefitPlansWeightedaverageassumptionstodeterminepensionbenefitobligationDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#BenefitPlansWeightedaverageassumptionstodeterminepensionbenefitobligationDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/BenefitPlansWeightedaverageassumptionstodeterminepensionbenefitobligationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/BenefitPlansChangesinobligationsandplanassetsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#BenefitPlansChangesinobligationsandplanassetsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/BenefitPlansChangesinobligationsandplanassetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_a3a8f9a1-b8f3-4d01-9636-c9922ba0a606" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_971bb453-d2a4-4ae6-9ea9-41e9c07151fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_a3a8f9a1-b8f3-4d01-9636-c9922ba0a606" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_971bb453-d2a4-4ae6-9ea9-41e9c07151fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_98017cb0-c2d7-42da-b913-40f5e690ed56" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_a3a8f9a1-b8f3-4d01-9636-c9922ba0a606" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_98017cb0-c2d7-42da-b913-40f5e690ed56" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/BenefitPlansComponentsofnetperiodicbenefitcostDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#BenefitPlansComponentsofnetperiodicbenefitcostDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/BenefitPlansComponentsofnetperiodicbenefitcostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_ab53a06d-091d-4fc0-9078-05c2328982fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_aaa8ff5e-0ee2-4da8-9d2c-603c2fd6a144" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_ab53a06d-091d-4fc0-9078-05c2328982fd" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_aaa8ff5e-0ee2-4da8-9d2c-603c2fd6a144" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_36e7075b-6db6-448c-8b22-fa0bbae0c55e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_ab53a06d-091d-4fc0-9078-05c2328982fd" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_36e7075b-6db6-448c-8b22-fa0bbae0c55e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_89824c01-117d-4ca2-942f-df652e493b47" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_ab53a06d-091d-4fc0-9078-05c2328982fd" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_89824c01-117d-4ca2-942f-df652e493b47" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_8ebab33a-265b-4fcc-918d-b47c6bb97f4f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_ab53a06d-091d-4fc0-9078-05c2328982fd" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_8ebab33a-265b-4fcc-918d-b47c6bb97f4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_6c5a0801-f609-4689-8f87-29af935d5288" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_ab53a06d-091d-4fc0-9078-05c2328982fd" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_6c5a0801-f609-4689-8f87-29af935d5288" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/BenefitPlansEstimatedfuturebenefitpaymentsexpectedtobepaidDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#BenefitPlansEstimatedfuturebenefitpaymentsexpectedtobepaidDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/BenefitPlansEstimatedfuturebenefitpaymentsexpectedtobepaidDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/RegulatoryMatters" xlink:type="simple" xlink:href="ucbi-20201231.xsd#RegulatoryMatters"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/RegulatoryMatters" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/RegulatoryMattersTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#RegulatoryMattersTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/RegulatoryMattersTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/RegulatoryMattersRegulatorycapitalratiosandminimumamountsrequiredDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#RegulatoryMattersRegulatorycapitalratiosandminimumamountsrequiredDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/RegulatoryMattersRegulatorycapitalratiosandminimumamountsrequiredDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/RegulatoryMattersNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#RegulatoryMattersNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/RegulatoryMattersNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsandContingencies" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CommitmentsandContingencies"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsandContingencies" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsandContingenciesTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CommitmentsandContingenciesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsandContingenciesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsandContingenciesContractualamountofoffbalancesheetinstrumentsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CommitmentsandContingenciesContractualamountofoffbalancesheetinstrumentsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsandContingenciesContractualamountofoffbalancesheetinstrumentsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnly" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnly"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnly" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyTables" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyBalanceSheetsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyBalanceSheetsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_bca6fd06-95c3-4852-90a5-6851b50de004" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_a4aec2ee-d326-48f8-9430-8db17f4d3b70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bca6fd06-95c3-4852-90a5-6851b50de004" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_a4aec2ee-d326-48f8-9430-8db17f4d3b70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_InvestmentsInBank_8364135f-4bdd-4c9c-a014-f5404f58b711" xlink:href="ucbi-20201231.xsd#ucbi_InvestmentsInBank"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bca6fd06-95c3-4852-90a5-6851b50de004" xlink:to="loc_ucbi_InvestmentsInBank_8364135f-4bdd-4c9c-a014-f5404f58b711" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_d45136b6-3d5f-4cca-aaec-c7dc085ab429" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bca6fd06-95c3-4852-90a5-6851b50de004" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_d45136b6-3d5f-4cca-aaec-c7dc085ab429" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_7933e11a-18db-4a6e-9c8d-82ed377c42f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bca6fd06-95c3-4852-90a5-6851b50de004" xlink:to="loc_us-gaap_OtherAssets_7933e11a-18db-4a6e-9c8d-82ed377c42f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_13f9a4bf-abfd-402b-9ef4-f3d0829486c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_266bbfad-1841-4733-9123-11dbacfcca40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_13f9a4bf-abfd-402b-9ef4-f3d0829486c0" xlink:to="loc_us-gaap_LongTermDebt_266bbfad-1841-4733-9123-11dbacfcca40" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_412d35aa-8052-4edb-aff1-6699ca24b550" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_13f9a4bf-abfd-402b-9ef4-f3d0829486c0" xlink:to="loc_us-gaap_OtherLiabilities_412d35aa-8052-4edb-aff1-6699ca24b550" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyStatementsofIncomeDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyStatementsofIncomeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyStatementsofIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_CondensedIncomeStatementTotalExpense_3d36d2f7-e942-4cb4-9733-2be396c7d437" xlink:href="ucbi-20201231.xsd#ucbi_CondensedIncomeStatementTotalExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_816c1c01-1575-4fe3-bb73-87927ee56e75" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_CondensedIncomeStatementTotalExpense_3d36d2f7-e942-4cb4-9733-2be396c7d437" xlink:to="loc_us-gaap_InterestExpense_816c1c01-1575-4fe3-bb73-87927ee56e75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenses_80a456a3-8058-407c-8c16-aefd2dd3e8ba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherExpenses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_CondensedIncomeStatementTotalExpense_3d36d2f7-e942-4cb4-9733-2be396c7d437" xlink:to="loc_us-gaap_OtherExpenses_80a456a3-8058-407c-8c16-aefd2dd3e8ba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f1f8a2c9-fb0f-4406-a0de-49dbea1ed656" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries_47421ef4-e4f6-4e4b-9189-1775056c6ca2" xlink:href="ucbi-20201231.xsd#ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_f1f8a2c9-fb0f-4406-a0de-49dbea1ed656" xlink:to="loc_ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries_47421ef4-e4f6-4e4b-9189-1775056c6ca2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromSubsidiariesNetOfTax_698e34d8-c758-464c-a54d-23bff44315ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromSubsidiariesNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_f1f8a2c9-fb0f-4406-a0de-49dbea1ed656" xlink:to="loc_us-gaap_IncomeLossFromSubsidiariesNetOfTax_698e34d8-c758-464c-a54d-23bff44315ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries_b650fc98-8ad7-4024-b088-703da57a35ed" xlink:href="ucbi-20201231.xsd#ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_CondensedIncomeStatementIncome_1b105e65-f040-4c4c-9e1d-7514c57c3656" xlink:href="ucbi-20201231.xsd#ucbi_CondensedIncomeStatementIncome"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries_b650fc98-8ad7-4024-b088-703da57a35ed" xlink:to="loc_ucbi_CondensedIncomeStatementIncome_1b105e65-f040-4c4c-9e1d-7514c57c3656" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_CondensedIncomeStatementTotalExpense_5e428428-6132-4e98-ab62-d501db6b75bf" xlink:href="ucbi-20201231.xsd#ucbi_CondensedIncomeStatementTotalExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries_b650fc98-8ad7-4024-b088-703da57a35ed" xlink:to="loc_ucbi_CondensedIncomeStatementTotalExpense_5e428428-6132-4e98-ab62-d501db6b75bf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_ba9b9f89-63d8-4556-a797-439b69afb053" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_IncomeLossBeforeEquityInUndistributedEarningsOfSubsidiaries_b650fc98-8ad7-4024-b088-703da57a35ed" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_ba9b9f89-63d8-4556-a797-439b69afb053" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_CondensedIncomeStatementIncome_065e0b51-8d62-44b1-b7de-14e36ffdf3ad" xlink:href="ucbi-20201231.xsd#ucbi_CondensedIncomeStatementIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DividendIncomeReceivedFromConsolidatedSubsidiariesBank_e12c63a3-99e3-4d3e-9699-61f3e7c0c952" xlink:href="ucbi-20201231.xsd#ucbi_DividendIncomeReceivedFromConsolidatedSubsidiariesBank"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_CondensedIncomeStatementIncome_065e0b51-8d62-44b1-b7de-14e36ffdf3ad" xlink:to="loc_ucbi_DividendIncomeReceivedFromConsolidatedSubsidiariesBank_e12c63a3-99e3-4d3e-9699-61f3e7c0c952" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_DividendIncomeReceivedFromConsolidatedSubsidiariesOther_acfc97de-d139-4d3a-97fe-85e06a73ca41" xlink:href="ucbi-20201231.xsd#ucbi_DividendIncomeReceivedFromConsolidatedSubsidiariesOther"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_CondensedIncomeStatementIncome_065e0b51-8d62-44b1-b7de-14e36ffdf3ad" xlink:to="loc_ucbi_DividendIncomeReceivedFromConsolidatedSubsidiariesOther_acfc97de-d139-4d3a-97fe-85e06a73ca41" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SharedServiceFeesFromSubsidiaries_2e360ffc-292b-466f-9041-57af355f4045" xlink:href="ucbi-20201231.xsd#ucbi_SharedServiceFeesFromSubsidiaries"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_CondensedIncomeStatementIncome_065e0b51-8d62-44b1-b7de-14e36ffdf3ad" xlink:to="loc_ucbi_SharedServiceFeesFromSubsidiaries_2e360ffc-292b-466f-9041-57af355f4045" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_4cca7b4d-7739-467c-9931-5c5f0472ddaf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncome"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_CondensedIncomeStatementIncome_065e0b51-8d62-44b1-b7de-14e36ffdf3ad" xlink:to="loc_us-gaap_OtherIncome_4cca7b4d-7739-467c-9931-5c5f0472ddaf" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyStatementsofCashFlowsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyStatementsofCashFlowsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CondensedFinancialStatementsofUnitedCommunityBanksIncHoldingCompanyOnlyStatementsofCashFlowsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SubsequentEvents" xlink:type="simple" xlink:href="ucbi-20201231.xsd#SubsequentEvents"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SubsequentEvents" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="ucbi-20201231.xsd#SubsequentEventsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SubsequentEventsDetails" xlink:type="extended"/>
</link:linkbase>
