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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:8438f9ec-ca19-4e39-98bd-0cddd330f1ae,g:7b43021b-0844-4e19-abca-7aaddff66f39-->
<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-20200930.xsd#Cover"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/Cover" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedBalanceSheetsUnaudited"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_e559cc8e-7df9-493e-96b2-7aeec889217f" 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_479b8e3a-19d1-4b32-82bf-e2af4924352e" 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_e559cc8e-7df9-493e-96b2-7aeec889217f" xlink:to="loc_us-gaap_NotesReceivableGross_479b8e3a-19d1-4b32-82bf-e2af4924352e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_3a4d794c-f6b6-4676-a3ac-50c85486fa01" 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_e559cc8e-7df9-493e-96b2-7aeec889217f" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_3a4d794c-f6b6-4676-a3ac-50c85486fa01" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_226ed6f2-7e4c-4391-9648-6b95f3c2f84b" 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_b53f1da4-28f4-434c-b492-e4e079d8b8cf" 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_226ed6f2-7e4c-4391-9648-6b95f3c2f84b" xlink:to="loc_us-gaap_NoninterestBearingDepositLiabilities_b53f1da4-28f4-434c-b492-e4e079d8b8cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositLiabilities_f97ffd2b-ce90-41ab-bce3-24c5f331ca61" 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_226ed6f2-7e4c-4391-9648-6b95f3c2f84b" xlink:to="loc_us-gaap_InterestBearingDepositLiabilities_f97ffd2b-ce90-41ab-bce3-24c5f331ca61" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_dbeec006-c02d-4bd8-bdc4-c321997fc628" 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_4787368e-87f0-45bd-ae41-524f89adcb29" 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_dbeec006-c02d-4bd8-bdc4-c321997fc628" xlink:to="loc_us-gaap_PreferredStockIncludingAdditionalPaidInCapitalNetOfDiscount_4787368e-87f0-45bd-ae41-524f89adcb29" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_b6503129-aa30-4fae-8597-d27fb700b804" 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_dbeec006-c02d-4bd8-bdc4-c321997fc628" xlink:to="loc_us-gaap_CommonStockValue_b6503129-aa30-4fae-8597-d27fb700b804" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_CommonStocksIssuable_9d23687d-da04-490d-8957-2231359dad86" xlink:href="ucbi-20200930.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_dbeec006-c02d-4bd8-bdc4-c321997fc628" xlink:to="loc_ucbi_CommonStocksIssuable_9d23687d-da04-490d-8957-2231359dad86" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_4065910d-4023-4544-9c92-35f9e0f5afbc" 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_dbeec006-c02d-4bd8-bdc4-c321997fc628" xlink:to="loc_us-gaap_AdditionalPaidInCapital_4065910d-4023-4544-9c92-35f9e0f5afbc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_8a853fdb-d815-4343-a06e-f3f67c98f792" 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_dbeec006-c02d-4bd8-bdc4-c321997fc628" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_8a853fdb-d815-4343-a06e-f3f67c98f792" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_c44e2cdd-b43a-4bfc-a328-ef36605eeba3" 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_dbeec006-c02d-4bd8-bdc4-c321997fc628" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_c44e2cdd-b43a-4bfc-a328-ef36605eeba3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_54fe6cac-39d6-43cd-ae48-49a2e84a19e1" 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_6c0b50fe-c282-4e10-b551-01aabec99e2b" 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_54fe6cac-39d6-43cd-ae48-49a2e84a19e1" xlink:to="loc_us-gaap_Liabilities_6c0b50fe-c282-4e10-b551-01aabec99e2b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fc247590-ae16-4f71-b858-f6635585f545" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_54fe6cac-39d6-43cd-ae48-49a2e84a19e1" xlink:to="loc_us-gaap_StockholdersEquity_fc247590-ae16-4f71-b858-f6635585f545" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_fb6140ec-a889-483c-94a8-c5d2d4a7158b" 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_5a724011-699c-4873-98bb-04bb385abc5a" 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_fb6140ec-a889-483c-94a8-c5d2d4a7158b" xlink:to="loc_us-gaap_CashAndDueFromBanks_5a724011-699c-4873-98bb-04bb385abc5a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_b2719f36-54cb-4bd0-b80c-151695211187" 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_fb6140ec-a889-483c-94a8-c5d2d4a7158b" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_b2719f36-54cb-4bd0-b80c-151695211187" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_b9ce728e-5b79-42d1-82ca-6e8949b7157f" 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_890186c4-9cec-4a42-ac39-cda2930af311" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_890186c4-9cec-4a42-ac39-cda2930af311" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_8d301164-0bc2-4772-b5c2-842ded833b5c" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_8d301164-0bc2-4772-b5c2-842ded833b5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_5f23e510-cace-4ed4-9cb1-91bd4505fd86" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_HeldToMaturitySecurities_5f23e510-cace-4ed4-9cb1-91bd4505fd86" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_8322a948-fca3-4268-a8e9-75211016fb93" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_8322a948-fca3-4268-a8e9-75211016fb93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_de2c9b69-84e5-4b81-af54-f0dd69c39fd3" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_NotesReceivableNet_de2c9b69-84e5-4b81-af54-f0dd69c39fd3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_29aa1298-6e4a-4e04-9e7b-cf87b532ae2c" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_29aa1298-6e4a-4e04-9e7b-cf87b532ae2c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_4ed0bbd3-d7b8-4b08-88db-7b066512721b" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_4ed0bbd3-d7b8-4b08-88db-7b066512721b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedInvestmentIncomeReceivable_02ba1c79-91f3-4aea-a77f-af2c7bfc92e8" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_AccruedInvestmentIncomeReceivable_02ba1c79-91f3-4aea-a77f-af2c7bfc92e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_0e676025-242a-4796-9df2-e7784dac0eac" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_0e676025-242a-4796-9df2-e7784dac0eac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_5e27643b-0d46-4b11-8f83-07e54e2c6fdb" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_5e27643b-0d46-4b11-8f83-07e54e2c6fdb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_8551413f-e327-4eb3-943a-b8d7ab5bb576" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_8551413f-e327-4eb3-943a-b8d7ab5bb576" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_ddd978a1-d996-4291-9ee7-d86f9ba32465" 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_b9ce728e-5b79-42d1-82ca-6e8949b7157f" xlink:to="loc_us-gaap_OtherAssets_ddd978a1-d996-4291-9ee7-d86f9ba32465" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_59a54e82-a014-4de0-b61d-30bfa9cc1abe" 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_45d57d66-673f-4d00-84ad-029039cb1e13" 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_59a54e82-a014-4de0-b61d-30bfa9cc1abe" xlink:to="loc_us-gaap_Deposits_45d57d66-673f-4d00-84ad-029039cb1e13" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_dabb617b-2644-4231-89da-3e77e0b01d5d" 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_59a54e82-a014-4de0-b61d-30bfa9cc1abe" xlink:to="loc_us-gaap_LongTermDebt_dabb617b-2644-4231-89da-3e77e0b01d5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_5e592478-ed42-4d57-a00e-9a5f1f54df5a" 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_59a54e82-a014-4de0-b61d-30bfa9cc1abe" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_5e592478-ed42-4d57-a00e-9a5f1f54df5a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_931eaca3-5945-4b1d-8543-209ac14504c4" 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_59a54e82-a014-4de0-b61d-30bfa9cc1abe" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_931eaca3-5945-4b1d-8543-209ac14504c4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedBalanceSheetsUnauditedParenthetical"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofIncomeUnaudited" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedStatementsofIncomeUnaudited"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofIncomeUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" 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_38934a94-fbf2-4269-b8b0-26e995201a84" 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_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_LaborAndRelatedExpense_38934a94-fbf2-4269-b8b0-26e995201a84" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_d76a636e-7d80-4d82-a7fc-c24ba5659f78" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommunicationsAndInformationTechnology"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_d76a636e-7d80-4d82-a7fc-c24ba5659f78" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_b69b6296-63ee-4e70-8099-6d5affbf6804" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OccupancyNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_OccupancyNet_b69b6296-63ee-4e70-8099-6d5affbf6804" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingAndAdvertisingExpense_d3ee8d57-3674-4410-9a2f-77d57e30afe9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_MarketingAndAdvertisingExpense_d3ee8d57-3674-4410-9a2f-77d57e30afe9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuppliesAndPostageExpense_c540024b-d720-4b7e-9cd5-ed43c9fc373a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SuppliesAndPostageExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_SuppliesAndPostageExpense_c540024b-d720-4b7e-9cd5-ed43c9fc373a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_efae0878-fd9e-499d-9eb2-d779deb438c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfessionalFees"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_ProfessionalFees_efae0878-fd9e-499d-9eb2-d779deb438c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanPortfolioExpense_4ba4d735-4cd5-4f6b-8c0e-0fe6a6c4e74c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoanPortfolioExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_LoanPortfolioExpense_4ba4d735-4cd5-4f6b-8c0e-0fe6a6c4e74c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_NoninterestExpenseOutsideServicesElectronicBanking_42f1486d-76c0-4f25-bd65-ee13004b276c" xlink:href="ucbi-20200930.xsd#ucbi_NoninterestExpenseOutsideServicesElectronicBanking"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_ucbi_NoninterestExpenseOutsideServicesElectronicBanking_42f1486d-76c0-4f25-bd65-ee13004b276c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalDepositInsuranceCorporationPremiumExpense_8a8b8d94-e25e-4857-bd5a-49d395937583" 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_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_FederalDepositInsuranceCorporationPremiumExpense_8a8b8d94-e25e-4857-bd5a-49d395937583" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_aaed430c-22c1-4837-8649-53bc4ec3c1ca" 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_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_aaed430c-22c1-4837-8649-53bc4ec3c1ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_dbe76632-6fef-4c97-b891-a302d04d400c" 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_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_dbe76632-6fef-4c97-b891-a302d04d400c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_e9a51850-df52-46e1-aa00-36e3f316295b" 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_7a310973-454d-4576-8674-1e6f868da904" xlink:to="loc_us-gaap_OtherNoninterestExpense_e9a51850-df52-46e1-aa00-36e3f316295b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_1919b181-94eb-47d9-b6aa-5c051d2e8ca2" 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_d87a0a15-5294-433d-8c8a-37367a9022bb" 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_1919b181-94eb-47d9-b6aa-5c051d2e8ca2" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_d87a0a15-5294-433d-8c8a-37367a9022bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecurities_a46cda3d-93e7-44b8-bedc-916f117e119d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_1919b181-94eb-47d9-b6aa-5c051d2e8ca2" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecurities_a46cda3d-93e7-44b8-bedc-916f117e119d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks_436124cb-edb3-4ce6-b3bd-7a99336ac32b" xlink:href="ucbi-20200930.xsd#ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_1919b181-94eb-47d9-b6aa-5c051d2e8ca2" xlink:to="loc_ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks_436124cb-edb3-4ce6-b3bd-7a99336ac32b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_a7a8ba9b-7b11-46a9-883c-e2aaf5dad9d8" 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_30cf8d52-1122-4b4f-8734-999b697db67a" 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_a7a8ba9b-7b11-46a9-883c-e2aaf5dad9d8" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_30cf8d52-1122-4b4f-8734-999b697db67a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_b04d2db1-b5f5-4851-b8c8-a3c541e7a52c" 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_a7a8ba9b-7b11-46a9-883c-e2aaf5dad9d8" xlink:to="loc_us-gaap_NoninterestIncome_b04d2db1-b5f5-4851-b8c8-a3c541e7a52c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_7c91d713-20eb-458f-b48b-e84cd083e438" 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_ba08e840-3812-48be-ba02-9393294f4ede" 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_7c91d713-20eb-458f-b48b-e84cd083e438" xlink:to="loc_us-gaap_NoninterestIncomeOther_ba08e840-3812-48be-ba02-9393294f4ede" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BrokerageCommissionsRevenue_3c073542-6e09-4300-ba8f-4e0526f2a069" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BrokerageCommissionsRevenue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_7c91d713-20eb-458f-b48b-e84cd083e438" xlink:to="loc_us-gaap_BrokerageCommissionsRevenue_3c073542-6e09-4300-ba8f-4e0526f2a069" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfLoansNet_180cad0d-11ac-4e7f-a502-7a3f2f0a24c8" 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_7c91d713-20eb-458f-b48b-e84cd083e438" xlink:to="loc_us-gaap_GainLossOnSalesOfLoansNet_180cad0d-11ac-4e7f-a502-7a3f2f0a24c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_c8f3b149-22d4-4cbc-99a6-45caf1561f0b" 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_7c91d713-20eb-458f-b48b-e84cd083e438" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_c8f3b149-22d4-4cbc-99a6-45caf1561f0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_dd2732c4-5285-440a-ba5a-ce064e8b1172" 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_7c91d713-20eb-458f-b48b-e84cd083e438" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_dd2732c4-5285-440a-ba5a-ce064e8b1172" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_1881280b-b756-4a1c-8470-e4354c127127" 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_1777af7d-1949-42ac-9cf6-271394a3fd25" 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_1881280b-b756-4a1c-8470-e4354c127127" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_1777af7d-1949-42ac-9cf6-271394a3fd25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_6138131b-7f71-4a46-a929-7d27abeed096" 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_1881280b-b756-4a1c-8470-e4354c127127" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_6138131b-7f71-4a46-a929-7d27abeed096" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_b9f34ffe-7dc3-440a-86c9-c18789ffbaad" 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_0e02e4b8-9215-4092-b8bc-d82f9a705f46" 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_b9f34ffe-7dc3-440a-86c9-c18789ffbaad" xlink:to="loc_us-gaap_InterestExpenseDeposits_0e02e4b8-9215-4092-b8bc-d82f9a705f46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOtherShortTermBorrowings_9993b59a-58cf-46d8-9629-96d62fbd7b8c" 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_b9f34ffe-7dc3-440a-86c9-c18789ffbaad" xlink:to="loc_us-gaap_InterestExpenseOtherShortTermBorrowings_9993b59a-58cf-46d8-9629-96d62fbd7b8c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_3c80566d-7dfc-4795-9536-82ea06668b5a" 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_b9f34ffe-7dc3-440a-86c9-c18789ffbaad" xlink:to="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_3c80566d-7dfc-4795-9536-82ea06668b5a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseLongTermDebt_c95bf84f-71de-4916-8dd9-ef60a63ad06a" 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_b9f34ffe-7dc3-440a-86c9-c18789ffbaad" xlink:to="loc_us-gaap_InterestExpenseLongTermDebt_c95bf84f-71de-4916-8dd9-ef60a63ad06a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_3c570ccf-a819-43b8-a464-ea3d0c28cfae" 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_1971d6e5-483a-45a0-9f19-639e0e924543" 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_3c570ccf-a819-43b8-a464-ea3d0c28cfae" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_1971d6e5-483a-45a0-9f19-639e0e924543" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_31b23fd9-1c2d-4af3-a86f-890c995fbb68" 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_3c570ccf-a819-43b8-a464-ea3d0c28cfae" xlink:to="loc_us-gaap_InterestExpense_31b23fd9-1c2d-4af3-a86f-890c995fbb68" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_b2a12934-fb85-46ee-88f1-48a183de8fc4" 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_53f741f0-c1ad-4b92-ab8b-ac46538939a0" 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_b2a12934-fb85-46ee-88f1-48a183de8fc4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_53f741f0-c1ad-4b92-ab8b-ac46538939a0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_c40d500c-9afa-463e-97b5-764dc723919d" 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_b2a12934-fb85-46ee-88f1-48a183de8fc4" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_c40d500c-9afa-463e-97b5-764dc723919d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_8418fcc6-6645-497f-9c12-1cc62fbc60af" 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_32ac6419-6cfc-45d2-a69b-d9a0b341a510" 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_8418fcc6-6645-497f-9c12-1cc62fbc60af" xlink:to="loc_us-gaap_Revenues_32ac6419-6cfc-45d2-a69b-d9a0b341a510" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_36817a07-4be0-4fc9-a0eb-c93903365f39" 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_8418fcc6-6645-497f-9c12-1cc62fbc60af" xlink:to="loc_us-gaap_NoninterestExpense_36817a07-4be0-4fc9-a0eb-c93903365f39" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofIncomeUnauditedParenthetical" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedStatementsofIncomeUnauditedParenthetical"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofIncomeUnauditedParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofComprehensiveIncomeUnaudited" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedStatementsofComprehensiveIncomeUnaudited"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofComprehensiveIncomeUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_fcd8cf9b-7388-434b-98c5-4859e909eb44" xlink:href="ucbi-20200930.xsd#ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax_97e386d5-7f64-41ec-b304-d7f85f51a500" xlink:href="ucbi-20200930.xsd#ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_fcd8cf9b-7388-434b-98c5-4859e909eb44" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax_97e386d5-7f64-41ec-b304-d7f85f51a500" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect_42346230-8ce1-4323-a0c2-1729ba368200" xlink:href="ucbi-20200930.xsd#ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_fcd8cf9b-7388-434b-98c5-4859e909eb44" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect_42346230-8ce1-4323-a0c2-1729ba368200" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_38cca6fb-f2dd-4e10-b3e7-1f52576d702e" 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_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_3322e7ca-778e-450e-b25b-1e43de13be3b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_38cca6fb-f2dd-4e10-b3e7-1f52576d702e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_3322e7ca-778e-450e-b25b-1e43de13be3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_2d46e03f-8840-47c1-9340-fc80527b0602" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_38cca6fb-f2dd-4e10-b3e7-1f52576d702e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_2d46e03f-8840-47c1-9340-fc80527b0602" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_f40a201a-6a7a-452e-b432-a235572a67bc" xlink:href="ucbi-20200930.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_c16760d8-bb62-4aef-a40c-96212a35f7c2" xlink:href="ucbi-20200930.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_f40a201a-6a7a-452e-b432-a235572a67bc" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_c16760d8-bb62-4aef-a40c-96212a35f7c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit1_0d552369-b8d1-4d45-895b-7eb6ae1e38c4" xlink:href="ucbi-20200930.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_f40a201a-6a7a-452e-b432-a235572a67bc" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit1_0d552369-b8d1-4d45-895b-7eb6ae1e38c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_f6e4a425-e8b3-4e4a-a36e-7c9cbb83e0c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_46b92591-f2ed-4d77-a989-312b98e6419d" 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_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_f6e4a425-e8b3-4e4a-a36e-7c9cbb83e0c6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_46b92591-f2ed-4d77-a989-312b98e6419d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax_6dbe4b04-db89-4c79-aa0d-57124a50741f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_f6e4a425-e8b3-4e4a-a36e-7c9cbb83e0c6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax_6dbe4b04-db89-4c79-aa0d-57124a50741f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ComprehensiveIncomeLossBeforeTax_f37c1abd-3844-4232-bd9c-a560f256ddb8" xlink:href="ucbi-20200930.xsd#ucbi_ComprehensiveIncomeLossBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_57cc768a-0898-47a6-8c7c-c5d0c4382a81" 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_ucbi_ComprehensiveIncomeLossBeforeTax_f37c1abd-3844-4232-bd9c-a560f256ddb8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_57cc768a-0898-47a6-8c7c-c5d0c4382a81" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_59472d47-e9c4-4193-b5b0-4ee94c1a9b9b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_ComprehensiveIncomeLossBeforeTax_f37c1abd-3844-4232-bd9c-a560f256ddb8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_59472d47-e9c4-4193-b5b0-4ee94c1a9b9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ComprehensiveIncomeLossTax_1b961d7b-d980-4de5-a316-41cd0a416b25" xlink:href="ucbi-20200930.xsd#ucbi_ComprehensiveIncomeLossTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_f66eb1e6-b4f6-4d32-aa9a-4d2d7a58709b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_ComprehensiveIncomeLossTax_1b961d7b-d980-4de5-a316-41cd0a416b25" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_f66eb1e6-b4f6-4d32-aa9a-4d2d7a58709b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6d630e49-701f-43bd-b4e7-2428c0290956" 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_ucbi_ComprehensiveIncomeLossTax_1b961d7b-d980-4de5-a316-41cd0a416b25" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6d630e49-701f-43bd-b4e7-2428c0290956" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_a107f68c-8003-40a1-a130-d35fe717f2f0" 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_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_72055a27-b8cd-420e-b8e6-d6d0596acd78" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_a107f68c-8003-40a1-a130-d35fe717f2f0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_72055a27-b8cd-420e-b8e6-d6d0596acd78" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_89d10c6f-33dd-4f11-8a2f-61d6d357c919" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_a107f68c-8003-40a1-a130-d35fe717f2f0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_89d10c6f-33dd-4f11-8a2f-61d6d357c919" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_17e04678-4255-4fb2-ba69-de0ae40b6a99" xlink:href="ucbi-20200930.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_61ca7755-ec2f-4bec-b5d2-ab0417499432" xlink:href="ucbi-20200930.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_17e04678-4255-4fb2-ba69-de0ae40b6a99" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_61ca7755-ec2f-4bec-b5d2-ab0417499432" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_c7fe35ef-d00a-49bb-a866-5d1f10ab78e1" xlink:href="ucbi-20200930.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_17e04678-4255-4fb2-ba69-de0ae40b6a99" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_c7fe35ef-d00a-49bb-a866-5d1f10ab78e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_d154f402-b162-45fb-acc9-1c2be99f3c8f" 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_9c43b86b-7a8e-4814-91e6-ab2280eaa168" 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_d154f402-b162-45fb-acc9-1c2be99f3c8f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_9c43b86b-7a8e-4814-91e6-ab2280eaa168" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_26c6bb3c-579e-4563-8056-e5889af17dd6" 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_d154f402-b162-45fb-acc9-1c2be99f3c8f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_26c6bb3c-579e-4563-8056-e5889af17dd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_40b527a7-2a40-40e0-b8e3-fe64692ad0d1" 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_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_3413b9c2-cf1b-487b-8879-7713397ae530" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_40b527a7-2a40-40e0-b8e3-fe64692ad0d1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_3413b9c2-cf1b-487b-8879-7713397ae530" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_281b86a7-7aa0-45e9-a0a3-2c4510004701" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_40b527a7-2a40-40e0-b8e3-fe64692ad0d1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_281b86a7-7aa0-45e9-a0a3-2c4510004701" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_a10600a5-f228-4cb6-93bb-1ad6b3182bb9" 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_b6833e16-1d45-4d06-b277-dfbd8c18cf8d" 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_a10600a5-f228-4cb6-93bb-1ad6b3182bb9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_b6833e16-1d45-4d06-b277-dfbd8c18cf8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_4f0ffea2-10e9-44dc-82e4-a9f7ed933c8d" 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_a10600a5-f228-4cb6-93bb-1ad6b3182bb9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_4f0ffea2-10e9-44dc-82e4-a9f7ed933c8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_e14ee006-4bb8-4617-9b7e-9cdb8be13f98" 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_us-gaap_NetIncomeLoss_204cd718-acd3-4ee3-a261-5b9449cf8460" 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_ComprehensiveIncomeNetOfTax_e14ee006-4bb8-4617-9b7e-9cdb8be13f98" xlink:to="loc_us-gaap_NetIncomeLoss_204cd718-acd3-4ee3-a261-5b9449cf8460" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_c24b4487-9db5-45fe-bd0b-db240e2ab90f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_e14ee006-4bb8-4617-9b7e-9cdb8be13f98" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_c24b4487-9db5-45fe-bd0b-db240e2ab90f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_8ec9426e-d473-4b1f-8c8d-6c1d61f8b6dc" 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_c369a194-2222-45b0-9f51-bb13a1611c7e" 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_8ec9426e-d473-4b1f-8c8d-6c1d61f8b6dc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_c369a194-2222-45b0-9f51-bb13a1611c7e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_7636430e-9149-4cf6-9cd3-1c694287c836" 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_8ec9426e-d473-4b1f-8c8d-6c1d61f8b6dc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_7636430e-9149-4cf6-9cd3-1c694287c836" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_dc9596b7-98a8-40c8-ad3a-432e64f14632" xlink:href="ucbi-20200930.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax_03dfdc45-dfb2-4a45-be3d-ad853a274a86" xlink:href="ucbi-20200930.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_dc9596b7-98a8-40c8-ad3a-432e64f14632" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax_03dfdc45-dfb2-4a45-be3d-ad853a274a86" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax_17d900c9-4174-43ab-985c-98c33efaf6ea" xlink:href="ucbi-20200930.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_dc9596b7-98a8-40c8-ad3a-432e64f14632" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax_17d900c9-4174-43ab-985c-98c33efaf6ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_f5326183-5006-4747-ad22-ef71983f6400" 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_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_0a8daff9-e971-4983-b3ea-cb92ea953437" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_f5326183-5006-4747-ad22-ef71983f6400" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_0a8daff9-e971-4983-b3ea-cb92ea953437" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_ddecd539-a26c-47a6-9598-81026c26cc61" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_f5326183-5006-4747-ad22-ef71983f6400" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_ddecd539-a26c-47a6-9598-81026c26cc61" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofComprehensiveIncomeUnaudited_1" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedStatementsofComprehensiveIncomeUnaudited_1"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofComprehensiveIncomeUnaudited_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_7249ae43-7b42-4444-8736-9e0656d705ee" 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_275c3510-e4c5-4e5c-84a4-5054f579c120" xlink:href="ucbi-20200930.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_7249ae43-7b42-4444-8736-9e0656d705ee" xlink:to="loc_ucbi_ComprehensiveIncomeLossBeforeTax_275c3510-e4c5-4e5c-84a4-5054f579c120" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ComprehensiveIncomeLossTax_c5d10ddb-e31e-47ec-8496-625087c2a1e6" xlink:href="ucbi-20200930.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_7249ae43-7b42-4444-8736-9e0656d705ee" xlink:to="loc_ucbi_ComprehensiveIncomeLossTax_c5d10ddb-e31e-47ec-8496-625087c2a1e6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementofChangesinShareholdersEquityUnaudited" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedStatementofChangesinShareholdersEquityUnaudited"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementofChangesinShareholdersEquityUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementofChangesinShareholdersEquityUnauditedParentheticals" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedStatementofChangesinShareholdersEquityUnauditedParentheticals"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementofChangesinShareholdersEquityUnauditedParentheticals" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsofCashFlowsUnaudited" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ConsolidatedStatementsofCashFlowsUnaudited"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsofCashFlowsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2af376ff-d166-4d43-bf59-e274aac8635b" 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_6cf39ed7-3f49-415f-8e1a-70e36e28daca" 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_2af376ff-d166-4d43-bf59-e274aac8635b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6cf39ed7-3f49-415f-8e1a-70e36e28daca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_b4f8945a-357a-4e98-9cea-8f05a1cb73ad" 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_2af376ff-d166-4d43-bf59-e274aac8635b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_b4f8945a-357a-4e98-9cea-8f05a1cb73ad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0577524e-9a31-4c65-80ed-d83fe390ef54" 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_2af376ff-d166-4d43-bf59-e274aac8635b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0577524e-9a31-4c65-80ed-d83fe390ef54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" 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_c1f441cb-882c-4a42-93ce-f64e62bd3e43" 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_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_c1f441cb-882c-4a42-93ce-f64e62bd3e43" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_f4ef31b7-f8e5-408a-ab1b-3d5b6ca9a59d" 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_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_f4ef31b7-f8e5-408a-ab1b-3d5b6ca9a59d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_71981a93-8781-4f8d-8faf-162928dd8bb1" 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_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_71981a93-8781-4f8d-8faf-162928dd8bb1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_9661caf6-e2ac-4a67-933e-abaf35115bb8" 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_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_9661caf6-e2ac-4a67-933e-abaf35115bb8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_65de30fe-b26f-4203-b263-087ffb0faf7e" 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_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_65de30fe-b26f-4203-b263-087ffb0faf7e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireLoansAndLeasesHeldForInvestment_3cc29755-975b-4931-ac8f-b76770fc5ff2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireLoansAndLeasesHeldForInvestment"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_PaymentsToAcquireLoansAndLeasesHeldForInvestment_3cc29755-975b-4931-ac8f-b76770fc5ff2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f2ab2175-b275-4515-ae73-43504dce6db4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f2ab2175-b275-4515-ae73-43504dce6db4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_541ab49d-1852-44d6-b872-e7ecf66dd8bb" 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_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_541ab49d-1852-44d6-b872-e7ecf66dd8bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_b0aba4bf-911b-400c-9d8f-d10d5adee2a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherRealEstate"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_b0aba4bf-911b-400c-9d8f-d10d5adee2a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_44f658be-5024-45aa-b29a-a7b78e8d55c2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_44f658be-5024-45aa-b29a-a7b78e8d55c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_400af7e2-ea67-4400-965d-1ee823399587" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1a3037a2-1435-4b22-8e2d-6b5e44d137f4" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_400af7e2-ea67-4400-965d-1ee823399587" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" 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_f5e7434b-8788-4baa-8c58-ae8a96be2fb0" 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_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_f5e7434b-8788-4baa-8c58-ae8a96be2fb0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfOtherLongTermDebt_2713fac7-ba50-4ad7-8940-2ab234e070b0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfOtherLongTermDebt"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_RepaymentsOfOtherLongTermDebt_2713fac7-ba50-4ad7-8940-2ab234e070b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_55cd7d25-11dc-4abb-aa52-d2943c707a33" 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_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_55cd7d25-11dc-4abb-aa52-d2943c707a33" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_d98ca722-d05e-4433-9683-22c3dfa1bd3b" 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_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_d98ca722-d05e-4433-9683-22c3dfa1bd3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_50655a6f-a44f-4c40-a045-1a4e1c628846" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_50655a6f-a44f-4c40-a045-1a4e1c628846" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans_d313af35-a916-4985-80f8-8afb111de7f2" xlink:href="ucbi-20200930.xsd#ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans_d313af35-a916-4985-80f8-8afb111de7f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_9b4266e8-24b4-4def-a91c-0597579d8be2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_9b4266e8-24b4-4def-a91c-0597579d8be2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_82852afd-8b7f-4aa4-9739-064956c246d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_82852afd-8b7f-4aa4-9739-064956c246d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_69956607-0253-4371-a726-e39028f56232" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_69956607-0253-4371-a726-e39028f56232" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_1711fe42-34aa-48c5-989f-e2bfb94ecac5" 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_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_1711fe42-34aa-48c5-989f-e2bfb94ecac5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_8fc65a22-81dc-4230-bb88-ce30a9bc217a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_8fc65a22-81dc-4230-bb88-ce30a9bc217a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_7c8a19dc-e4d2-43e5-a28b-b0e7e6ab2d3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13a42864-245e-44b4-a080-657d1eed339b" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_7c8a19dc-e4d2-43e5-a28b-b0e7e6ab2d3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" 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_333eff27-367f-4749-a114-c31440691e8f" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_NetIncomeLoss_333eff27-367f-4749-a114-c31440691e8f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_cf7eae8c-c219-4ca0-9cbb-f0e598fcd715" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_cf7eae8c-c219-4ca0-9cbb-f0e598fcd715" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_27be2924-979b-4262-9bcf-16bae0cc36ac" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_27be2924-979b-4262-9bcf-16bae0cc36ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_86a56fc2-557b-4c2e-b6c2-ee6ee0b439c4" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_ShareBasedCompensation_86a56fc2-557b-4c2e-b6c2-ee6ee0b439c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f32ff007-542a-444d-a6f7-03aec72216e2" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f32ff007-542a-444d-a6f7-03aec72216e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_2fb7c167-338b-4139-be3b-dcf774a74eec" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_2fb7c167-338b-4139-be3b-dcf774a74eec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_7a6f6855-2017-4a83-b534-6668417ffc5c" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_7a6f6855-2017-4a83-b534-6668417ffc5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_ae30e880-8e24-4095-8372-63f46b80e8eb" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_ae30e880-8e24-4095-8372-63f46b80e8eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_c322d66f-d2a7-40a2-b03d-17708f7aa475" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_c322d66f-d2a7-40a2-b03d-17708f7aa475" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_e1041ee4-3a0b-42fa-a807-7bd4163ecfcf" 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_ae591c47-7dc5-4cb7-84d8-32148f3cb00d" xlink:to="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_e1041ee4-3a0b-42fa-a807-7bd4163ecfcf" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/AccountingPolicies" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AccountingPolicies"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AccountingPoliciesPolicies" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AccountingPoliciesPolicies"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingPoliciesPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AccountingPoliciesDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AccountingPoliciesDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingPoliciesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AccountingStandardsUpdatesandRecentlyAdoptedStandards" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.xsd#AccountingStandardsUpdatesandRecentlyAdoptedStandardsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingStandardsUpdatesandRecentlyAdoptedStandardsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/Acquisitions" xlink:type="simple" xlink:href="ucbi-20200930.xsd#Acquisitions"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/Acquisitions" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AcquisitionsTables" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AcquisitionsTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AcquisitionsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AcquisitionsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AcquisitionsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AcquisitionsAcquisitiondatefairvalueofpurchasedassetsandassumedliabilitiesDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AcquisitionsAcquisitiondatefairvalueofpurchasedassetsandassumedliabilitiesDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AcquisitionsAcquisitiondatefairvalueofpurchasedassetsandassumedliabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_0db887fa-961a-4ed0-a709-c8a405fbb853" 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_ea4615d0-7958-4291-ac96-23a5c4a3365e" 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_0db887fa-961a-4ed0-a709-c8a405fbb853" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_ea4615d0-7958-4291-ac96-23a5c4a3365e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_16ff2adc-9bfc-4c82-b5df-8668e3b40af0" 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_0db887fa-961a-4ed0-a709-c8a405fbb853" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_16ff2adc-9bfc-4c82-b5df-8668e3b40af0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_781644b0-54c1-4f9c-b6e4-b71659958969" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_707b4372-c92d-4dcc-bf02-b3b15931a6a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_781644b0-54c1-4f9c-b6e4-b71659958969" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_707b4372-c92d-4dcc-bf02-b3b15931a6a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_adec51e7-1e45-4829-891f-f1111d6bd448" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_781644b0-54c1-4f9c-b6e4-b71659958969" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_adec51e7-1e45-4829-891f-f1111d6bd448" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_AggregateFairValueAdjustments_d6e66d37-8965-430b-bc7d-3a19d4bfccbd" xlink:href="ucbi-20200930.xsd#ucbi_AggregateFairValueAdjustments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_21563b88-59d1-47d9-88d8-53d0f7543878" 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_ucbi_AggregateFairValueAdjustments_d6e66d37-8965-430b-bc7d-3a19d4bfccbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_21563b88-59d1-47d9-88d8-53d0f7543878" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_52021d4d-5997-4f8c-9f56-f4ce2cd3a97a" 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_ucbi_AggregateFairValueAdjustments_d6e66d37-8965-430b-bc7d-3a19d4bfccbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_52021d4d-5997-4f8c-9f56-f4ce2cd3a97a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_4e7cdf19-8b0a-41a0-86de-348a0094452f" 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_a8be654d-b722-4c7e-9890-b6d4d5229d99" xlink:href="ucbi-20200930.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_4e7cdf19-8b0a-41a0-86de-348a0094452f" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_a8be654d-b722-4c7e-9890-b6d4d5229d99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermDebtAndFederalHomeLoanBankAdvances_1da56771-c0af-4d48-a6b7-35db6e5ab3f8" xlink:href="ucbi-20200930.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermDebtAndFederalHomeLoanBankAdvances"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_4e7cdf19-8b0a-41a0-86de-348a0094452f" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermDebtAndFederalHomeLoanBankAdvances_1da56771-c0af-4d48-a6b7-35db6e5ab3f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDerivatives_ece35013-a340-422d-9390-4e2c576d6825" xlink:href="ucbi-20200930.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_4e7cdf19-8b0a-41a0-86de-348a0094452f" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDerivatives_ece35013-a340-422d-9390-4e2c576d6825" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_e4922036-4719-4ed2-aeb1-6941b965ee71" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_4e7cdf19-8b0a-41a0-86de-348a0094452f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_e4922036-4719-4ed2-aeb1-6941b965ee71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_5840ca47-a006-4460-b778-ed148b49ec84" 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_ab5849a6-affc-4066-84a8-afc65b8b6ecb" 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_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_ab5849a6-affc-4066-84a8-afc65b8b6ecb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities_2e7608fc-fd09-4a39-b4ab-903f40ade4f7" 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_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities_2e7608fc-fd09-4a39-b4ab-903f40ade4f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_ba81a4f6-2149-4f2f-9eef-c79606bd1c63" 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_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_ba81a4f6-2149-4f2f-9eef-c79606bd1c63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_d94c2b49-7672-4b2a-ade4-dc2587e494a4" 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_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_d94c2b49-7672-4b2a-ade4-dc2587e494a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAccruedInterestReceivables_54075d63-f998-4db1-ad21-a94e130f041a" xlink:href="ucbi-20200930.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAccruedInterestReceivables"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAccruedInterestReceivables_54075d63-f998-4db1-ad21-a94e130f041a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsBankOwnedLifeInsurance_6fbcefac-c06f-4581-aa9b-91955fed18df" xlink:href="ucbi-20200930.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsBankOwnedLifeInsurance"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsBankOwnedLifeInsurance_6fbcefac-c06f-4581-aa9b-91955fed18df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_682b2f06-0cc6-4d96-948a-c701ecb84297" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_682b2f06-0cc6-4d96-948a-c701ecb84297" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_e39496c6-72b9-458e-9fd5-a428599d1a65" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_e39496c6-72b9-458e-9fd5-a428599d1a65" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_e0fda4d4-befc-4fe5-8c6e-f8d67fa9082c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_5840ca47-a006-4460-b778-ed148b49ec84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_e0fda4d4-befc-4fe5-8c6e-f8d67fa9082c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/AcquisitionsAcquiredloanportfolioatacquisitionDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AcquisitionsAcquiredloanportfolioatacquisitionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AcquisitionsAcquiredloanportfolioatacquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_bfb946d9-6413-4df1-86f2-b89f6247adef" 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_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_319b4875-b7b1-430a-afbe-f375b42268a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_bfb946d9-6413-4df1-86f2-b89f6247adef" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_319b4875-b7b1-430a-afbe-f375b42268a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_1725ac00-29a3-4621-9e5c-2ef63fc6ba68" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_bfb946d9-6413-4df1-86f2-b89f6247adef" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_1725ac00-29a3-4621-9e5c-2ef63fc6ba68" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_f4282351-94b1-4244-a081-a0051cf11cf8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_bfb946d9-6413-4df1-86f2-b89f6247adef" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_f4282351-94b1-4244-a081-a0051cf11cf8" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/AcquisitionsProformainformationDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AcquisitionsProformainformationDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AcquisitionsProformainformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/Securities" xlink:type="simple" xlink:href="ucbi-20200930.xsd#Securities"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/Securities" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesTables" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesAmortizedcostgrossunrealizedgainsandlossesandfairvalueofdebtsecuritiesheldtomaturityDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesAmortizedcostgrossunrealizedgainsandlossesandfairvalueofdebtsecuritiesheldtomaturityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesAmortizedcostgrossunrealizedgainsandlossesandfairvalueofdebtsecuritiesheldtomaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_e7e6b3ac-004a-489b-8cf0-228530ccdfaf" 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_74320b47-786e-4fd0-a2f9-4fe9bffb0d06" 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_e7e6b3ac-004a-489b-8cf0-228530ccdfaf" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_74320b47-786e-4fd0-a2f9-4fe9bffb0d06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_ba8b2f54-5d27-4972-abc0-aed20757dd69" 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_e7e6b3ac-004a-489b-8cf0-228530ccdfaf" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_ba8b2f54-5d27-4972-abc0-aed20757dd69" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_70dcc048-6d90-49aa-b82a-c151a6a9e493" 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_e7e6b3ac-004a-489b-8cf0-228530ccdfaf" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_70dcc048-6d90-49aa-b82a-c151a6a9e493" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesAmortizedcostgrossunrealizedgainsandlossesandfairvalueofdebtsecuritiesavailableforsaleDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesAmortizedcostgrossunrealizedgainsandlossesandfairvalueofdebtsecuritiesavailableforsaleDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesAmortizedcostgrossunrealizedgainsandlossesandfairvalueofdebtsecuritiesavailableforsaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_e527b27f-dea5-414b-90c7-51a0240eda99" 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_542cc107-1a07-4574-b288-9be152c7a150" 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_e527b27f-dea5-414b-90c7-51a0240eda99" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_542cc107-1a07-4574-b288-9be152c7a150" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_504d07ff-3724-441d-8130-8a76347e9aa0" 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_e527b27f-dea5-414b-90c7-51a0240eda99" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_504d07ff-3724-441d-8130-8a76347e9aa0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_6f020b33-9c34-4bd3-bc01-d37384f2d23d" 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_e527b27f-dea5-414b-90c7-51a0240eda99" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_6f020b33-9c34-4bd3-bc01-d37384f2d23d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesSummaryofdebtsecuritiesheldtomaturityinunrealizedlosspositionDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesSummaryofdebtsecuritiesheldtomaturityinunrealizedlosspositionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesSummaryofdebtsecuritiesheldtomaturityinunrealizedlosspositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_96776deb-619b-453e-b0be-b03058377831" 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_5f1dcf97-a4a1-4340-b625-3864047a30d0" 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_96776deb-619b-453e-b0be-b03058377831" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_5f1dcf97-a4a1-4340-b625-3864047a30d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_fea4500c-8452-44ab-bc17-d2d45bc30f96" 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_96776deb-619b-453e-b0be-b03058377831" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_fea4500c-8452-44ab-bc17-d2d45bc30f96" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_3c2f4910-3300-46ea-9295-f041f5382a07" 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_aa6fff36-a4f1-451a-a7de-ae1579dba1a9" 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_3c2f4910-3300-46ea-9295-f041f5382a07" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_aa6fff36-a4f1-451a-a7de-ae1579dba1a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_640a76c6-261a-4528-8db9-16b1fc647e1c" 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_3c2f4910-3300-46ea-9295-f041f5382a07" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_640a76c6-261a-4528-8db9-16b1fc647e1c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesSummaryofdebtsecuritiesavailableforsaleinunrealizedlosspositionDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesSummaryofdebtsecuritiesavailableforsaleinunrealizedlosspositionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesSummaryofdebtsecuritiesavailableforsaleinunrealizedlosspositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_29b19402-ad18-43d7-bc3f-63dfe9f3228b" 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_78b74af7-4476-41b7-9eaf-25c7cf2ab466" 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_29b19402-ad18-43d7-bc3f-63dfe9f3228b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_78b74af7-4476-41b7-9eaf-25c7cf2ab466" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_bab63aed-3c24-497d-ad09-1102a8dda78e" 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_29b19402-ad18-43d7-bc3f-63dfe9f3228b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_bab63aed-3c24-497d-ad09-1102a8dda78e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_f1137045-296f-455b-8ad5-1a739d316189" 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_b3bc4ed1-a1a0-4ddc-a5b3-4edfa9317bd6" 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_f1137045-296f-455b-8ad5-1a739d316189" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_b3bc4ed1-a1a0-4ddc-a5b3-4edfa9317bd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_2aa79a99-d40a-420d-8863-9f49219fc870" 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_f1137045-296f-455b-8ad5-1a739d316189" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_2aa79a99-d40a-420d-8863-9f49219fc870" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesSummaryofavailableforsalesecuritiessalesactivityDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesSummaryofavailableforsalesecuritiessalesactivityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesSummaryofavailableforsalesecuritiessalesactivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_bc65a61b-0247-4efa-9903-4e1c0f1d7eeb" 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_fd8a4c86-83fc-44ad-bbf1-2ec2eaf30533" 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_bc65a61b-0247-4efa-9903-4e1c0f1d7eeb" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_fd8a4c86-83fc-44ad-bbf1-2ec2eaf30533" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_d47c6b17-9043-4b2f-9f7f-327b6bf8a554" 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_bc65a61b-0247-4efa-9903-4e1c0f1d7eeb" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_d47c6b17-9043-4b2f-9f7f-327b6bf8a554" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesAmortizedcostandfairvalueofheldtomaturityandavailableforsalesecuritiesbycontractualmaturityDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#SecuritiesAmortizedcostandfairvalueofheldtomaturityandavailableforsalesecuritiesbycontractualmaturityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesAmortizedcostandfairvalueofheldtomaturityandavailableforsalesecuritiesbycontractualmaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_0caa2f6d-8330-4808-9944-a8b7f319f19a" 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_7cc58ba1-d858-4dfb-98e3-3b1e53671664" 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_0caa2f6d-8330-4808-9944-a8b7f319f19a" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_7cc58ba1-d858-4dfb-98e3-3b1e53671664" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_c4d8a007-21b0-4363-a6df-a187c714dbff" 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_0caa2f6d-8330-4808-9944-a8b7f319f19a" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_c4d8a007-21b0-4363-a6df-a187c714dbff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_436b5389-0004-4fd0-94f5-dc101a30650d" 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_0caa2f6d-8330-4808-9944-a8b7f319f19a" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_436b5389-0004-4fd0-94f5-dc101a30650d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue_df64616a-afed-4386-ac7a-6c86316ae450" 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_0caa2f6d-8330-4808-9944-a8b7f319f19a" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue_df64616a-afed-4386-ac7a-6c86316ae450" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_bc2376e0-9936-4307-82e6-ba5f746f5df3" 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_d333d968-f624-4143-8e9b-d3964642cf39" 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_bc2376e0-9936-4307-82e6-ba5f746f5df3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_d333d968-f624-4143-8e9b-d3964642cf39" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_a28a8136-9ab1-472b-a5df-241d3c21a759" 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_bc2376e0-9936-4307-82e6-ba5f746f5df3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_a28a8136-9ab1-472b-a5df-241d3c21a759" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_557f1722-3df0-49e4-b540-090e866c53ee" 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_bc2376e0-9936-4307-82e6-ba5f746f5df3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_557f1722-3df0-49e4-b540-090e866c53ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_af02bcd0-1976-412f-ab56-8d0e7d7f96ca" 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_bc2376e0-9936-4307-82e6-ba5f746f5df3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_af02bcd0-1976-412f-ab56-8d0e7d7f96ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_f64146fd-b918-467e-87e5-3a838b135790" 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_50919707-dbe7-4f03-bc89-245026e1c47f" 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_f64146fd-b918-467e-87e5-3a838b135790" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_50919707-dbe7-4f03-bc89-245026e1c47f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_f34cadff-7d13-4be8-9adb-f68adabdbae0" 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_f64146fd-b918-467e-87e5-3a838b135790" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_f34cadff-7d13-4be8-9adb-f68adabdbae0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_2e5a3b3b-93c5-459a-9481-5f7f5271dc7f" 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_f64146fd-b918-467e-87e5-3a838b135790" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_2e5a3b3b-93c5-459a-9481-5f7f5271dc7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_f85165c5-7f4a-4a9b-9520-7f8a73d50668" 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_f64146fd-b918-467e-87e5-3a838b135790" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_f85165c5-7f4a-4a9b-9520-7f8a73d50668" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fb77437f-3a20-4b2d-aad9-7af3dbe3a783" 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_90740239-09ee-4df3-a30d-933a1fe4dcac" 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_fb77437f-3a20-4b2d-aad9-7af3dbe3a783" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_90740239-09ee-4df3-a30d-933a1fe4dcac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_2c600310-5cf0-4908-b23a-5d41920ef697" 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_fb77437f-3a20-4b2d-aad9-7af3dbe3a783" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_2c600310-5cf0-4908-b23a-5d41920ef697" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_c3b9e8f2-292a-4f60-b385-33521eb6ddc1" 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_fb77437f-3a20-4b2d-aad9-7af3dbe3a783" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_c3b9e8f2-292a-4f60-b385-33521eb6ddc1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_a5cec70e-1935-449a-b417-e504d3e3a849" 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_fb77437f-3a20-4b2d-aad9-7af3dbe3a783" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_a5cec70e-1935-449a-b417-e504d3e3a849" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLosses" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMajorclassificationsofloansDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesMajorclassificationsofloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMajorclassificationsofloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesComponentsofnetinvestmentinleasesDetails" xlink:type="simple" xlink:href="ucbi-20200930.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_c64e918a-c904-427b-a62c-6bc42a12c698" 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_09ae74e6-42aa-49d0-aa98-e2bc4c513309" 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_c64e918a-c904-427b-a62c-6bc42a12c698" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable_09ae74e6-42aa-49d0-aa98-e2bc4c513309" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesUnguaranteedResidualAsset_4dabecb5-ad6f-4d32-a554-908d3537f4ef" xlink:href="ucbi-20200930.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_c64e918a-c904-427b-a62c-6bc42a12c698" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesUnguaranteedResidualAsset_4dabecb5-ad6f-4d32-a554-908d3537f4ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesInitialDirectCosts_94609f7e-ba5e-46af-bb55-40608d3a1d1b" xlink:href="ucbi-20200930.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_c64e918a-c904-427b-a62c-6bc42a12c698" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesInitialDirectCosts_94609f7e-ba5e-46af-bb55-40608d3a1d1b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesSecurityDeposits_b3d1d643-1f7b-4391-8ea8-07ae966ae3dc" xlink:href="ucbi-20200930.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_c64e918a-c904-427b-a62c-6bc42a12c698" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesSecurityDeposits_b3d1d643-1f7b-4391-8ea8-07ae966ae3dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesPurchaseAccountingPremium_7a02dbe5-1df6-4d2e-84a7-c2d97502f331" xlink:href="ucbi-20200930.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_c64e918a-c904-427b-a62c-6bc42a12c698" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesPurchaseAccountingPremium_7a02dbe5-1df6-4d2e-84a7-c2d97502f331" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesDeferredSellingProfit_a092646c-2a10-49a9-951d-e7f37c2a610d" xlink:href="ucbi-20200930.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_c64e918a-c904-427b-a62c-6bc42a12c698" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesDeferredSellingProfit_a092646c-2a10-49a9-951d-e7f37c2a610d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMinimumfutureleasepaymenttobereceivedDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesMinimumfutureleasepaymenttobereceivedDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesMinimumfutureleasepaymenttobereceivedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_c1200efc-4ae6-4676-a585-3a61daf2f8c7" 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_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_ab4abc38-6a3a-42e0-a08f-579ac5c78fde" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_c1200efc-4ae6-4676-a585-3a61daf2f8c7" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_ab4abc38-6a3a-42e0-a08f-579ac5c78fde" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_806b2adf-8020-4c62-9253-afab7d783fae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_c1200efc-4ae6-4676-a585-3a61daf2f8c7" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_806b2adf-8020-4c62-9253-afab7d783fae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_fcec3fb3-a464-45b8-a408-7893b336f7e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_c1200efc-4ae6-4676-a585-3a61daf2f8c7" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_fcec3fb3-a464-45b8-a408-7893b336f7e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_0ba320c5-0948-4fff-a503-6e62bbce56dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_c1200efc-4ae6-4676-a585-3a61daf2f8c7" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_0ba320c5-0948-4fff-a503-6e62bbce56dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_8ffc9293-1354-4537-bb68-c612f62d91c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_c1200efc-4ae6-4676-a585-3a61daf2f8c7" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_8ffc9293-1354-4537-bb68-c612f62d91c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_SalesTypeAndDirectFinancingLeasesLeaseReceivableToBeReceivedAfterYearFour_6957e923-2d2c-4072-a1bf-20df286e89f3" xlink:href="ucbi-20200930.xsd#ucbi_SalesTypeAndDirectFinancingLeasesLeaseReceivableToBeReceivedAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_c1200efc-4ae6-4676-a585-3a61daf2f8c7" xlink:to="loc_ucbi_SalesTypeAndDirectFinancingLeasesLeaseReceivableToBeReceivedAfterYearFour_6957e923-2d2c-4072-a1bf-20df286e89f3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesChangesinthevalueoftheaccretableyieldforacquiredloansDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesChangesinthevalueoftheaccretableyieldforacquiredloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesChangesinthevalueoftheaccretableyieldforacquiredloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAgingofamortizedcostbasisinloansbyagingcategoryandaccrualstatusDetails" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinnonaccrualloansbyloanclassDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinnonaccrualloansbyloanclassDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansandLeasesandAllowanceforCreditLossesAmortizedcostofloansbyriskcategorybyvintageyearDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesLoansandLeasesandAllowanceforCreditLossesAmortizedcostofloansbyriskcategorybyvintageyearDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansandLeasesandAllowanceforCreditLossesAmortizedcostofloansbyriskcategorybyvintageyearDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_7cbd00f7-cdd3-425a-a4eb-e1694367767f" 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_52b11acf-3c15-446f-a5a6-7ff57fc82796" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_52b11acf-3c15-446f-a5a6-7ff57fc82796" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_9915d02f-ae34-4ccc-9b5f-a0c50b7e5cab" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_9915d02f-ae34-4ccc-9b5f-a0c50b7e5cab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_68b883ff-a3cc-44fa-a039-a1d45b47fc08" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_68b883ff-a3cc-44fa-a039-a1d45b47fc08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_6be0c94e-24f0-444b-9e37-9cc15bc69bed" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_6be0c94e-24f0-444b-9e37-9cc15bc69bed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_8ec89fc1-9506-4928-afba-3445e19e88f2" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_8ec89fc1-9506-4928-afba-3445e19e88f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_88d1dd43-018d-47c1-9067-a3287f1a2da5" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_88d1dd43-018d-47c1-9067-a3287f1a2da5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRevolving_83ff22a5-5699-45e9-90bb-a2d7312112a1" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableRevolving_83ff22a5-5699-45e9-90bb-a2d7312112a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRevolvingConvertedToTermLoan_3c71a71d-2d10-4b1c-b958-31406324b46b" 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_7cbd00f7-cdd3-425a-a4eb-e1694367767f" xlink:to="loc_us-gaap_FinancingReceivableRevolvingConvertedToTermLoan_3c71a71d-2d10-4b1c-b958-31406324b46b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRiskcategoryofloansbyclassofloansDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesRiskcategoryofloansbyclassofloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRiskcategoryofloansbyclassofloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansmodifiedundertermsofTDRDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesLoansmodifiedundertermsofTDRDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansmodifiedundertermsofTDRDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesBalanceandactivityintheACLbyportfoliosegmentandrecordedinvestmentinloansbyportfoliosegmentDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesBalanceandactivityintheACLbyportfoliosegmentandrecordedinvestmentinloansbyportfoliosegmentDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesBalanceandactivityintheACLbyportfoliosegmentandrecordedinvestmentinloansbyportfoliosegmentDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinloansbyportfoliosegmentandthebalanceoftheallowanceforloanlossesDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinloansbyportfoliosegmentandthebalanceoftheallowanceforloanlossesDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesRecordedinvestmentinloansbyportfoliosegmentandthebalanceoftheallowanceforloanlossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_9bb369e1-8f7b-4482-9ea5-75fb841cc604" xlink:href="ucbi-20200930.xsd#ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment_fbf59cfc-64f6-46f8-be93-6bb6e5977305" xlink:href="ucbi-20200930.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_9bb369e1-8f7b-4482-9ea5-75fb841cc604" xlink:to="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment_fbf59cfc-64f6-46f8-be93-6bb6e5977305" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment_ba9d9ebd-6a60-4e14-a965-11979dfd30ea" xlink:href="ucbi-20200930.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_9bb369e1-8f7b-4482-9ea5-75fb841cc604" xlink:to="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment_ba9d9ebd-6a60-4e14-a965-11979dfd30ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityPCI_651727dc-d12e-43be-8f36-0c0f50ebdefc" xlink:href="ucbi-20200930.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_9bb369e1-8f7b-4482-9ea5-75fb841cc604" xlink:to="loc_ucbi_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiabilityPCI_651727dc-d12e-43be-8f36-0c0f50ebdefc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_0e99bd2d-ab0a-461a-817b-73de6a5a7e1d" 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_1b9add24-e4f6-404c-a90a-e6ccff126ba6" 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_0e99bd2d-ab0a-461a-817b-73de6a5a7e1d" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_1b9add24-e4f6-404c-a90a-e6ccff126ba6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_c7732490-2218-4914-b60a-e43aa5936b7c" 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_0e99bd2d-ab0a-461a-817b-73de6a5a7e1d" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_c7732490-2218-4914-b60a-e43aa5936b7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses_e503dda5-b7dc-4677-b1f3-3dfc0fac1cf4" 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_0e99bd2d-ab0a-461a-817b-73de6a5a7e1d" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses_e503dda5-b7dc-4677-b1f3-3dfc0fac1cf4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiability_aab221d4-6b39-41bb-b97f-35323fb585db" 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_51d7b3c5-6431-4847-84fc-3bc0fd112381" xlink:href="ucbi-20200930.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_aab221d4-6b39-41bb-b97f-35323fb585db" xlink:to="loc_ucbi_OffBalanceSheetLiabilityCreditLossLiabilityIndividuallyEvaluatedForImpairment_51d7b3c5-6431-4847-84fc-3bc0fd112381" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_OffBalanceSheetLiabilityCreditLossLiabilityCollectivelyEvaluatedForImpairment_5887a006-1254-48ce-a04a-3ffe8d9bacda" xlink:href="ucbi-20200930.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_aab221d4-6b39-41bb-b97f-35323fb585db" xlink:to="loc_ucbi_OffBalanceSheetLiabilityCreditLossLiabilityCollectivelyEvaluatedForImpairment_5887a006-1254-48ce-a04a-3ffe8d9bacda" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_ca7700c2-ef36-4dcd-b0f9-13463951db61" 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_b9eb64d5-bd8d-483a-8c8e-d91440d3f67a" 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_ca7700c2-ef36-4dcd-b0f9-13463951db61" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_b9eb64d5-bd8d-483a-8c8e-d91440d3f67a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_3bb5a761-b20c-4d92-a5a6-1e0abc12497c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_ca7700c2-ef36-4dcd-b0f9-13463951db61" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_3bb5a761-b20c-4d92-a5a6-1e0abc12497c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_7aa3d4a1-2ba7-4ceb-8b63-f24347543a0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_ca7700c2-ef36-4dcd-b0f9-13463951db61" xlink:to="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_7aa3d4a1-2ba7-4ceb-8b63-f24347543a0d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesLoansindividuallyevaluatedforimpairmentbyclassofloansDetails" xlink:type="simple" xlink:href="ucbi-20200930.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_4a171ec6-bba8-4f70-8c92-413b2d928aae" 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_eea9665a-2daf-4612-abf4-08dbe0ed9458" 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_4a171ec6-bba8-4f70-8c92-413b2d928aae" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_eea9665a-2daf-4612-abf4-08dbe0ed9458" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_ff8f5b48-52bd-43d7-b487-04d862d96411" 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_4a171ec6-bba8-4f70-8c92-413b2d928aae" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_ff8f5b48-52bd-43d7-b487-04d862d96411" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_a3705665-63f1-49af-91d6-8666ddf92d2b" 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_ffb88261-440d-4429-8579-926e846fd164" 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_a3705665-63f1-49af-91d6-8666ddf92d2b" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_ffb88261-440d-4429-8579-926e846fd164" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_a2c8063d-62cb-4672-9b15-ea53dcfcdfea" 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_a3705665-63f1-49af-91d6-8666ddf92d2b" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_a2c8063d-62cb-4672-9b15-ea53dcfcdfea" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAveragebalancesofimpairedloansandincomerecognizedonimpairedloansDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LoansandLeasesandAllowanceforCreditLossesAveragebalancesofimpairedloansandincomerecognizedonimpairedloansDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansandLeasesandAllowanceforCreditLossesAveragebalancesofimpairedloansandincomerecognizedonimpairedloansDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivities" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.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_f19968c6-b024-4e5e-b837-b2c4b70f182f" 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_14502f6f-8710-40d6-a5f0-d2d7a39d9c67" 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_f19968c6-b024-4e5e-b837-b2c4b70f182f" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_14502f6f-8710-40d6-a5f0-d2d7a39d9c67" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_78aefb5b-9de3-4dc9-811d-6217ee637bc9" 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_f19968c6-b024-4e5e-b837-b2c4b70f182f" xlink:to="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_78aefb5b-9de3-4dc9-811d-6217ee637bc9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueOfCollateral_90ab4d1e-cd20-48b1-b2d9-27f35d2bad0c" 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_f19968c6-b024-4e5e-b837-b2c4b70f182f" xlink:to="loc_us-gaap_DerivativeAssetFairValueOfCollateral_90ab4d1e-cd20-48b1-b2d9-27f35d2bad0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_6b8a3ff7-047f-4a56-8771-2ecc892bda10" 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_6ba32fea-d4fe-413c-9b96-d0f5af325ec7" 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_6b8a3ff7-047f-4a56-8771-2ecc892bda10" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_6ba32fea-d4fe-413c-9b96-d0f5af325ec7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_59f9ea2f-9ee6-4731-ae4d-636a404983fc" 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_6b8a3ff7-047f-4a56-8771-2ecc892bda10" xlink:to="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_59f9ea2f-9ee6-4731-ae4d-636a404983fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_9bb4e2fc-2bc9-4aa5-834a-b16b644b0380" 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_6b8a3ff7-047f-4a56-8771-2ecc892bda10" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_9bb4e2fc-2bc9-4aa5-834a-b16b644b0380" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.xsd#DerivativesandHedgingActivitiesEffectofderivativesinhedgingrelationshipsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesandHedgingActivitiesEffectofderivativesinhedgingrelationshipsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_GainLossOnCashFlowHedgesRecognizedInEarnings_34c5ea18-049a-4918-8e1a-12b3bf526c25" xlink:href="ucbi-20200930.xsd#ucbi_GainLossOnCashFlowHedgesRecognizedInEarnings"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_d228ea28-dbef-4284-8378-d8898047e7db" 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_34c5ea18-049a-4918-8e1a-12b3bf526c25" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_d228ea28-dbef-4284-8378-d8898047e7db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_473eccdc-b73c-4ff7-b0b8-c0206c21a71d" 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_ucbi_GainLossOnDerivativeInterestSettlement_13a222a9-3232-437c-b570-8d0c194700d8" xlink:href="ucbi-20200930.xsd#ucbi_GainLossOnDerivativeInterestSettlement"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_473eccdc-b73c-4ff7-b0b8-c0206c21a71d" xlink:to="loc_ucbi_GainLossOnDerivativeInterestSettlement_13a222a9-3232-437c-b570-8d0c194700d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_1d07699d-f024-4f6d-b858-95a348cba054" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_473eccdc-b73c-4ff7-b0b8-c0206c21a71d" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_1d07699d-f024-4f6d-b858-95a348cba054" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_81ee1bd9-487b-44e1-bd99-caee6212febd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_473eccdc-b73c-4ff7-b0b8-c0206c21a71d" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_81ee1bd9-487b-44e1-bd99-caee6212febd" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesandHedgingActivitiesCarryingamountandhedgeaccountingbasisadjustmentDetails" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.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-20200930.xsd#GoodwillandOtherIntangibleAssetsTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsCarryingamountDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#GoodwillandOtherIntangibleAssetsCarryingamountDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsCarryingamountDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2a60e80b-7c98-4090-8978-19586f37cd77" 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_IntangibleAssetsGrossExcludingGoodwill_81ac32a7-b496-44fc-a85b-c540079b70c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2a60e80b-7c98-4090-8978-19586f37cd77" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_81ac32a7-b496-44fc-a85b-c540079b70c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_d33d0d0b-c706-4844-9558-a06c47ced56c" 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_2a60e80b-7c98-4090-8978-19586f37cd77" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_d33d0d0b-c706-4844-9558-a06c47ced56c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_747df69b-6a2d-4971-896a-2646094ca624" 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_bdf89a22-3189-4324-8c15-bdf2c4a5b247" 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_747df69b-6a2d-4971-896a-2646094ca624" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdf89a22-3189-4324-8c15-bdf2c4a5b247" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_fcbc05dd-7ab2-4ac7-ba27-b6d0a1dbd765" 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_747df69b-6a2d-4971-896a-2646094ca624" xlink:to="loc_us-gaap_Goodwill_fcbc05dd-7ab2-4ac7-ba27-b6d0a1dbd765" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsChangesincarryingamountofgoodwillDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#GoodwillandOtherIntangibleAssetsChangesincarryingamountofgoodwillDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsChangesincarryingamountofgoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_26fa6913-2fa8-452a-a875-60235222039c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_6e18d28c-af3f-457a-aae4-b93c46f19266" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Goodwill_26fa6913-2fa8-452a-a875-60235222039c" xlink:to="loc_us-gaap_GoodwillGross_6e18d28c-af3f-457a-aae4-b93c46f19266" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_0af42d3a-3730-43e7-ab11-0ad4a2f48670" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Goodwill_26fa6913-2fa8-452a-a875-60235222039c" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_0af42d3a-3730-43e7-ab11-0ad4a2f48670" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/GoodwillandOtherIntangibleAssetsEstimatedaggregateamortizationexpenseforfutureperiodsDetails" xlink:type="simple" xlink:href="ucbi-20200930.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_7a171f01-6673-4cc4-973b-18c2170f89e1" 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_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_358df7b4-d0b8-437b-b035-66e56a0ef866" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a171f01-6673-4cc4-973b-18c2170f89e1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_358df7b4-d0b8-437b-b035-66e56a0ef866" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_2542b7a5-260e-4785-8298-07e7350c5ddc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a171f01-6673-4cc4-973b-18c2170f89e1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_2542b7a5-260e-4785-8298-07e7350c5ddc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_0eb48387-8976-40ed-802c-bc11c0547928" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a171f01-6673-4cc4-973b-18c2170f89e1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_0eb48387-8976-40ed-802c-bc11c0547928" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_04c9411d-669c-46be-86cc-044e3ce788cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a171f01-6673-4cc4-973b-18c2170f89e1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_04c9411d-669c-46be-86cc-044e3ce788cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_56224e8b-cf78-4262-bb45-d140c0f3f762" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a171f01-6673-4cc4-973b-18c2170f89e1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_56224e8b-cf78-4262-bb45-d140c0f3f762" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_5da3fb53-a94b-460d-b031-5ddc1462c147" xlink:href="ucbi-20200930.xsd#ucbi_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a171f01-6673-4cc4-973b-18c2170f89e1" xlink:to="loc_ucbi_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_5da3fb53-a94b-460d-b031-5ddc1462c147" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LongtermDebt" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.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_57e5493a-3aa7-4cea-8a70-09f63f392e1d" 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_1ef3c162-aede-4389-a6a8-da7897328a06" 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_57e5493a-3aa7-4cea-8a70-09f63f392e1d" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_1ef3c162-aede-4389-a6a8-da7897328a06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_e9e1f9fe-ce4b-4ae0-b9b8-aef020c976ef" 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_57e5493a-3aa7-4cea-8a70-09f63f392e1d" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_e9e1f9fe-ce4b-4ae0-b9b8-aef020c976ef" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/LongtermDebtNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#LongtermDebtNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/LongtermDebtNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeases" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.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-20200930.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-20200930.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_65b6331e-7be8-4b37-a0de-ecb8b099bb61" 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_8cdaeb5f-6943-408f-8600-34a615c79cf6" 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_65b6331e-7be8-4b37-a0de-ecb8b099bb61" xlink:to="loc_us-gaap_OperatingLeaseCost_8cdaeb5f-6943-408f-8600-34a615c79cf6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_0b3a99c5-15e2-4ae9-a1aa-c99248d40918" 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_65b6331e-7be8-4b37-a0de-ecb8b099bb61" xlink:to="loc_us-gaap_VariableLeaseCost_0b3a99c5-15e2-4ae9-a1aa-c99248d40918" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_5bb5016d-8771-400a-baa2-752806dad593" 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_65b6331e-7be8-4b37-a0de-ecb8b099bb61" xlink:to="loc_us-gaap_ShortTermLeaseCost_5bb5016d-8771-400a-baa2-752806dad593" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesFutureminimumleasepaymentsDetails" xlink:type="simple" xlink:href="ucbi-20200930.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_0c8f89c3-e5b6-4fe3-990c-4895b6fc07d9" 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_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_2a21610c-a598-416f-ba54-23a5358385e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0c8f89c3-e5b6-4fe3-990c-4895b6fc07d9" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_2a21610c-a598-416f-ba54-23a5358385e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_dcab1743-2b04-437c-b121-c9d214ae6cca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0c8f89c3-e5b6-4fe3-990c-4895b6fc07d9" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_dcab1743-2b04-437c-b121-c9d214ae6cca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_57b9b06a-3a7c-44e6-b80a-7cf4d7a9b5a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0c8f89c3-e5b6-4fe3-990c-4895b6fc07d9" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_57b9b06a-3a7c-44e6-b80a-7cf4d7a9b5a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_b006b9b9-b00c-407c-afca-90bfd373afe0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0c8f89c3-e5b6-4fe3-990c-4895b6fc07d9" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_b006b9b9-b00c-407c-afca-90bfd373afe0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_9e499841-5154-4f1e-84b0-3cf674cee267" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0c8f89c3-e5b6-4fe3-990c-4895b6fc07d9" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_9e499841-5154-4f1e-84b0-3cf674cee267" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour_f0ecd90f-d4ec-4eb5-8fe7-9b36d7e49b4c" xlink:href="ucbi-20200930.xsd#ucbi_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0c8f89c3-e5b6-4fe3-990c-4895b6fc07d9" xlink:to="loc_ucbi_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour_f0ecd90f-d4ec-4eb5-8fe7-9b36d7e49b4c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesFutureminimumleasepaymentsDetails_1" xlink:type="simple" xlink:href="ucbi-20200930.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_0c9b29f8-264b-405b-8d98-0f17c3c719ef" 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_f8eb0a9b-4fd3-438e-8120-5033ac682be4" 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_0c9b29f8-264b-405b-8d98-0f17c3c719ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_f8eb0a9b-4fd3-438e-8120-5033ac682be4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_77fb1fef-8d61-4b2f-9c38-90cd558804a9" 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_0c9b29f8-264b-405b-8d98-0f17c3c719ef" xlink:to="loc_us-gaap_OperatingLeaseLiability_77fb1fef-8d61-4b2f-9c38-90cd558804a9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValue" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValue"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValue" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueTables" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValueTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueAssetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValueAssetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueAssetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_874033c5-27cd-476a-9640-a3cefca6b73f" 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_f1ff2f11-95d9-447d-ac1b-02e5333b37bc" 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_874033c5-27cd-476a-9640-a3cefca6b73f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_f1ff2f11-95d9-447d-ac1b-02e5333b37bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_b6019ecb-db13-40ee-bddf-dddf604fda1b" 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_874033c5-27cd-476a-9640-a3cefca6b73f" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_b6019ecb-db13-40ee-bddf-dddf604fda1b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_dc4f1de1-75fa-48f7-a0cb-714a4d5202c3" 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_874033c5-27cd-476a-9640-a3cefca6b73f" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_dc4f1de1-75fa-48f7-a0cb-714a4d5202c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_b5c903ae-f459-470d-97ef-8806d4a2d44f" 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_874033c5-27cd-476a-9640-a3cefca6b73f" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_b5c903ae-f459-470d-97ef-8806d4a2d44f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_bb8036a1-b7ae-44ac-b04f-982e7c38683a" 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_874033c5-27cd-476a-9640-a3cefca6b73f" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_bb8036a1-b7ae-44ac-b04f-982e7c38683a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ucbi_ResidentialMortgageServicingAssetAtFairValueAmount_a137ad1e-3def-4a26-9751-bf2d1dee353a" xlink:href="ucbi-20200930.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_874033c5-27cd-476a-9640-a3cefca6b73f" xlink:to="loc_ucbi_ResidentialMortgageServicingAssetAtFairValueAmount_a137ad1e-3def-4a26-9751-bf2d1dee353a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_eba28248-5e10-4493-8fcc-45fd8c116d79" 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_874033c5-27cd-476a-9640-a3cefca6b73f" xlink:to="loc_us-gaap_DerivativeAssets_eba28248-5e10-4493-8fcc-45fd8c116d79" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_2cd80f29-a4d7-4670-bcf2-971a16317d60" 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_a5997b0f-15be-4b5a-ba09-1cbb8298ce33" 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_2cd80f29-a4d7-4670-bcf2-971a16317d60" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_a5997b0f-15be-4b5a-ba09-1cbb8298ce33" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_bb2dade1-04e0-4d80-b751-ee0f5db832c9" 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_2cd80f29-a4d7-4670-bcf2-971a16317d60" xlink:to="loc_us-gaap_DerivativeLiabilities_bb2dade1-04e0-4d80-b751-ee0f5db832c9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueReconciliationformeasurementsatfairvalueonarecurringbasisusingsignificantunobservableinputsDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValueReconciliationformeasurementsatfairvalueonarecurringbasisusingsignificantunobservableinputsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueReconciliationformeasurementsatfairvalueonarecurringbasisusingsignificantunobservableinputsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueQuantitativeinformationaboutLevel3fairvaluemeasurementsforfairvalueonrecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValueQuantitativeinformationaboutLevel3fairvaluemeasurementsforfairvalueonrecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueQuantitativeinformationaboutLevel3fairvaluemeasurementsforfairvalueonrecurringbasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueFairValueOptionDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValueFairValueOptionDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueFairValueOptionDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueAssetsandliabilitiesmeasuredatfairvalueonnonrecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValueAssetsandliabilitiesmeasuredatfairvalueonnonrecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueAssetsandliabilitiesmeasuredatfairvalueonnonrecurringbasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueFairvaluesforotherfinancialinstrumentsthatarenotmeasuredatfairvalueonrecurringbasisDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#AssetsandLiabilitiesMeasuredatFairValueFairvaluesforotherfinancialinstrumentsthatarenotmeasuredatfairvalueonrecurringbasisDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsandLiabilitiesMeasuredatFairValueFairvaluesforotherfinancialinstrumentsthatarenotmeasuredatfairvalueonrecurringbasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommonandPreferredStock" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.xsd#CommonandPreferredStockDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommonandPreferredStockDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensation" xlink:type="simple" xlink:href="ucbi-20200930.xsd#StockBasedCompensation"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensation" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationTables" xlink:type="simple" xlink:href="ucbi-20200930.xsd#StockBasedCompensationTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationStockoptionactivityDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#StockBasedCompensationStockoptionactivityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationStockoptionactivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationRestrictedstockunitactivityDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#StockBasedCompensationRestrictedstockunitactivityDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationRestrictedstockunitactivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutofAccumulatedOtherComprehensiveIncome" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ReclassificationsOutofAccumulatedOtherComprehensiveIncome"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutofAccumulatedOtherComprehensiveIncome" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutofAccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ReclassificationsOutofAccumulatedOtherComprehensiveIncomeTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutofAccumulatedOtherComprehensiveIncomeTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#ReclassificationsOutofAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShare" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.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_2b729fc8-0843-4b41-b612-a12b5764ee9f" 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_8d9f417d-43e3-48e8-adeb-240d00b9ee06" 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_2b729fc8-0843-4b41-b612-a12b5764ee9f" xlink:to="loc_us-gaap_NetIncomeLoss_8d9f417d-43e3-48e8-adeb-240d00b9ee06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_3904caae-b6a1-4800-b08b-3c72a5960c8a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_2b729fc8-0843-4b41-b612-a12b5764ee9f" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_3904caae-b6a1-4800-b08b-3c72a5960c8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_34c1005a-3959-4cde-b6ee-6183dc0aeed6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_2b729fc8-0843-4b41-b612-a12b5764ee9f" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_34c1005a-3959-4cde-b6ee-6183dc0aeed6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a2b15a83-9ce2-4daa-bff3-ae5718053319" 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_6e59652a-7d3c-41f1-a125-d4b04d41af1d" 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_a2b15a83-9ce2-4daa-bff3-ae5718053319" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_6e59652a-7d3c-41f1-a125-d4b04d41af1d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_39db8f72-3632-44e8-a8a3-5735405a259b" 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_a2b15a83-9ce2-4daa-bff3-ae5718053319" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_39db8f72-3632-44e8-a8a3-5735405a259b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShareNarrativeDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#EarningsPerShareNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/RegulatoryMatters" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.xsd#RegulatoryMattersTables"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/RegulatoryMattersTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/RegulatoryMattersDetails" xlink:type="simple" xlink:href="ucbi-20200930.xsd#RegulatoryMattersDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/RegulatoryMattersDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsandContingencies" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.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-20200930.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-20200930.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://ucbi.com/role/SubsequentEvents" xlink:type="simple" xlink:href="ucbi-20200930.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-20200930.xsd#SubsequentEventsDetails"/>
  <link:calculationLink xlink:role="http://ucbi.com/role/SubsequentEventsDetails" xlink:type="extended"/>
</link:linkbase>
