<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created with Toppan Merrill Bridge  9.2.0.80 -->
<!--Based on XBRL 2.1-->
<!--Created on: 5/20/2019 11:12:50 AM-->
<!--Modified on: 5/20/2019 11:12:50 AM-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#StatementStatementsOfFinancialCondition" roleURI="http://www.tradeweb.com/role/StatementStatementsOfFinancialCondition" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#StatementConsolidatedStatementsOfFinancialConditionTradewebMarketsLlcAndSubsidiaries" roleURI="http://www.tradeweb.com/role/StatementConsolidatedStatementsOfFinancialConditionTradewebMarketsLlcAndSubsidiaries" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#StatementConsolidatedStatementsOfIncomeTradewebMarketsLlcAndSubsidiaries" roleURI="http://www.tradeweb.com/role/StatementConsolidatedStatementsOfIncomeTradewebMarketsLlcAndSubsidiaries" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#StatementConsolidatedStatementsOfComprehensiveIncomeTradewebMarketsLlcAndSubsidiaries" roleURI="http://www.tradeweb.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeTradewebMarketsLlcAndSubsidiaries" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureConsolidatedStatementsOfCashFlowsTradewebMarketsLlcAndSubsidiaries" roleURI="http://www.tradeweb.com/role/DisclosureConsolidatedStatementsOfCashFlowsTradewebMarketsLlcAndSubsidiaries" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureLeasesTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetails" roleURI="http://www.tradeweb.com/role/DisclosureLeasesTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetails" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureLeasesDetailsTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetailsCalc2" roleURI="http://www.tradeweb.com/role/DisclosureLeasesDetailsTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetailsCalc2" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureLeasesDetailsTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetailsCalc2s" roleURI="http://www.tradeweb.com/role/DisclosureLeasesDetailsTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetailsCalc2s" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureIntangibleAssetsAndGoodwillFiniteLivedIntangibleAssetsTradewebMarketsLlcAndSubsidiariesDetails" roleURI="http://www.tradeweb.com/role/DisclosureIntangibleAssetsAndGoodwillFiniteLivedIntangibleAssetsTradewebMarketsLlcAndSubsidiariesDetails" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureIncomeTaxesComponentsOfProvisionTradewebMarketsLlcAndSubsidiariesDetails" roleURI="http://www.tradeweb.com/role/DisclosureIncomeTaxesComponentsOfProvisionTradewebMarketsLlcAndSubsidiariesDetails" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureNetIncomePerShareTradewebMarketsLlcAndSubsidiariesDetails" roleURI="http://www.tradeweb.com/role/DisclosureNetIncomePerShareTradewebMarketsLlcAndSubsidiariesDetails" />
  <roleRef xlink:type="simple" xlink:href="tw-20190331.xsd#DisclosureRegulatoryCapitalRequirementsTradewebMarketsLlcAndSubsidiariesDetails" roleURI="http://www.tradeweb.com/role/DisclosureRegulatoryCapitalRequirementsTradewebMarketsLlcAndSubsidiariesDetails" />
  <calculationLink xlink:role="http://www.tradeweb.com/role/StatementStatementsOfFinancialCondition" xlink:type="extended" xlink:title="00100 - Statement - Statements of Financial Condition">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Cash" xlink:label="us-gaap_Cash_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Cash_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_AdditionalPaidInCapitalCommonStock_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_CommonStockValue_636939475684377872" order="2" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/StatementConsolidatedStatementsOfFinancialConditionTradewebMarketsLlcAndSubsidiaries" xlink:type="extended" xlink:title="50100 - Statement - Consolidated Statements of Financial Condition (Tradeweb Markets LLC and Subsidiaries)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNet" xlink:label="us-gaap_AccountsReceivableNet_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_AccountsReceivableNet_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet" xlink:label="us-gaap_CapitalizedComputerSoftwareNet_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_CapitalizedComputerSoftwareNet_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_636939475684377872" order="3" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities" xlink:label="us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities_636939475684377872" order="4" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueFromAffiliates" xlink:label="us-gaap_DueFromAffiliates_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_DueFromAffiliates_636939475684377872" order="5" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="us-gaap_Goodwill_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Goodwill_636939475684377872" order="6" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_IntangibleAssetsNetExcludingGoodwill_636939475684377872" order="7" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset_636939475684377872" order="8" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssets" xlink:label="us-gaap_OtherAssets_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_OtherAssets_636939475684377872" order="9" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_636939475684377872" order="10" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:label="us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_636939475684377872" order="11" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedCash" xlink:label="us-gaap_RestrictedCash_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Assets" xlink:to="us-gaap_RestrictedCash_636939475684377872" order="12" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_Liabilities_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="us-gaap_DeferredIncomeTaxLiabilitiesNet_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToAffiliateCurrentAndNoncurrent" xlink:label="us-gaap_DueToAffiliateCurrentAndNoncurrent_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="us-gaap_DueToAffiliateCurrentAndNoncurrent_636939475684377872" order="3" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_636939475684377872" order="4" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="us-gaap_OperatingLeaseLiability_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="us-gaap_OperatingLeaseLiability_636939475684377872" order="5" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="us-gaap_ContractWithCustomerLiability_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="us-gaap_ContractWithCustomerLiability_636939475684377872" order="6" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_EquityCompensationPayable" xlink:label="tw_EquityCompensationPayable_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="tw_EquityCompensationPayable_636939475684377872" order="7" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PayablesToBrokerDealersAndClearingOrganizations" xlink:label="us-gaap_PayablesToBrokerDealersAndClearingOrganizations_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Liabilities_636939475684377872" xlink:to="us-gaap_PayablesToBrokerDealersAndClearingOrganizations_636939475684377872" order="8" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MembersEquity" xlink:label="us-gaap_MembersEquity_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_MembersEquity_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_MembersEquity_636939475684377872" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MembersCapital" xlink:label="us-gaap_MembersCapital_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_MembersEquity_636939475684377872" xlink:to="us-gaap_MembersCapital_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_636939475684377872" order="3" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/StatementConsolidatedStatementsOfIncomeTradewebMarketsLlcAndSubsidiaries" xlink:type="extended" xlink:title="50200 - Statement - Consolidated Statements of Income (Tradeweb Markets LLC and Subsidiaries)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="us-gaap_InvestmentIncomeInterest_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_636939475684377872" xlink:to="us-gaap_InvestmentIncomeInterest_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="us-gaap_OperatingIncomeLoss_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_636939475684377872" xlink:to="us-gaap_OperatingIncomeLoss_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="us-gaap_CostsAndExpenses_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_OperatingIncomeLoss_636939475684377872" xlink:to="us-gaap_CostsAndExpenses_636939475684377872" order="1" use="optional" weight="-1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommunicationsAndInformationTechnology" xlink:label="us-gaap_CommunicationsAndInformationTechnology_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CostsAndExpenses_636939475684377872" xlink:to="us-gaap_CommunicationsAndInformationTechnology_636939475684377872" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="us-gaap_DepreciationAndAmortization_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CostsAndExpenses_636939475684377872" xlink:to="us-gaap_DepreciationAndAmortization_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="us-gaap_LaborAndRelatedExpense_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CostsAndExpenses_636939475684377872" xlink:to="us-gaap_LaborAndRelatedExpense_636939475684377872" order="3" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OccupancyNet" xlink:label="us-gaap_OccupancyNet_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CostsAndExpenses_636939475684377872" xlink:to="us-gaap_OccupancyNet_636939475684377872" order="4" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherGeneralAndAdministrativeExpense" xlink:label="us-gaap_OtherGeneralAndAdministrativeExpense_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CostsAndExpenses_636939475684377872" xlink:to="us-gaap_OtherGeneralAndAdministrativeExpense_636939475684377872" order="5" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfessionalFees" xlink:label="us-gaap_ProfessionalFees_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CostsAndExpenses_636939475684377872" xlink:to="us-gaap_ProfessionalFees_636939475684377872" order="6" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Revenues" xlink:label="us-gaap_Revenues_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_OperatingIncomeLoss_636939475684377872" xlink:to="us-gaap_Revenues_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_ContingentConsiderationRelatedParties" xlink:label="tw_ContingentConsiderationRelatedParties_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Revenues_636939475684377872" xlink:to="tw_ContingentConsiderationRelatedParties_636939475684377872" order="1" use="optional" weight="-1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_Revenues_636939475684377872" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_636939475684377872" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="us-gaap_IncomeTaxExpenseBenefit_636939475684377872" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_IncomeTaxExpenseBenefit_636939475684377872" order="2" use="optional" weight="-1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeTradewebMarketsLlcAndSubsidiaries" xlink:type="extended" xlink:title="50300 - Statement - Consolidated Statements of Comprehensive Income (Tradeweb Markets LLC and Subsidiaries)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="us-gaap_NetIncomeLoss_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_636939475684533873" order="2" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureConsolidatedStatementsOfCashFlowsTradewebMarketsLlcAndSubsidiaries" xlink:type="extended" xlink:title="50500 - Disclosure - Consolidated Statements of Cash Flows (Tradeweb Markets LLC and Subsidiaries)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="us-gaap_PaymentsOfDividends_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities_636939475684533873" xlink:to="us-gaap_PaymentsOfDividends_636939475684533873" order="1" use="optional" weight="-1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_636939475684533873" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForSoftware" xlink:label="us-gaap_PaymentsForSoftware_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities_636939475684533873" xlink:to="us-gaap_PaymentsForSoftware_636939475684533873" order="1" use="optional" weight="-1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities_636939475684533873" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_636939475684533873" order="2" use="optional" weight="-1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" order="3" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_DeferredIncomeTaxExpenseBenefit_636939475684533873" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="us-gaap_DepreciationAndAmortization_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_DepreciationAndAmortization_636939475684533873" order="3" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseDueFromAffiliates" xlink:label="us-gaap_IncreaseDecreaseDueFromAffiliates_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseDueFromAffiliates_636939475684533873" order="4" use="optional" weight="-1" priority="3" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_636939475684533873" order="5" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable_636939475684533873" order="6" use="optional" weight="-1" priority="3" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="us-gaap_IncreaseDecreaseInDeferredRevenue_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInDeferredRevenue_636939475684533873" order="7" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:label="us-gaap_IncreaseDecreaseInDepositOtherAssets_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInDepositOtherAssets_636939475684533873" order="8" use="optional" weight="-1" priority="3" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInDueToAffiliates" xlink:label="us-gaap_IncreaseDecreaseInDueToAffiliates_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInDueToAffiliates_636939475684533873" order="9" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_636939475684533873" order="10" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInOtherOperatingAssets_636939475684533873" order="11" use="optional" weight="-1" priority="3" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesToBrokerDealers" xlink:label="us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_636939475684533873" order="12" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInBrokerageReceivables" xlink:label="us-gaap_IncreaseDecreaseInBrokerageReceivables_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_IncreaseDecreaseInBrokerageReceivables_636939475684533873" order="13" use="optional" weight="-1" priority="3" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_IncreaseDecreaseInEquityCompensationPayable" xlink:label="tw_IncreaseDecreaseInEquityCompensationPayable_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="tw_IncreaseDecreaseInEquityCompensationPayable_636939475684533873" order="14" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_ProfitLoss_636939475684533873" order="15" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities_636939475684533873" xlink:to="us-gaap_ShareBasedCompensation_636939475684533873" order="16" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_636939475684533873" order="4" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureLeasesTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetails" xlink:type="extended" xlink:title="90402 - Disclosure - Leases (Tradeweb Markets LLC and Subsidiaries) - Maturity of Lease Liabilities and Future Minimum Lease Payments (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311452110467" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311452110467" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_636939475684533873" order="1" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311452110467" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_636939475684533873" order="2" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311452110467" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_636939475684533873" order="3" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311452110467" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_636939475684533873" order="4" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311452110467" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_636939475684533873" order="5" use="optional" weight="1" priority="1" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureLeasesDetailsTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetailsCalc2" xlink:type="extended" xlink:title="90498 - Disclosure - Leases (Details) (Tradeweb Markets LLC and Subsidiaries) - Maturity of Lease Liabilities and Future Minimum Lease Payments (Details) (Calc 2)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311451954466" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311451954466" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="us-gaap_OperatingLeaseLiability_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_636923311451954466" xlink:to="us-gaap_OperatingLeaseLiability_636939475684533873" order="2" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureLeasesDetailsTradewebMarketsLlcAndSubsidiariesMaturityOfLeaseLiabilitiesAndFutureMinimumLeasePaymentsDetailsCalc2s" xlink:type="extended" xlink:title="90499 - Disclosure - Leases (Details) (Tradeweb Markets LLC and Subsidiaries) - Maturity of Lease Liabilities and Future Minimum Lease Payments (Details) (Calc 2)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_OperatingLeasesFutureMinimumLeasePaymentsRemainderOfFiscalYear" xlink:label="tw_OperatingLeasesFutureMinimumLeasePaymentsRemainderOfFiscalYear_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="tw_OperatingLeasesFutureMinimumLeasePaymentsRemainderOfFiscalYear_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_OperatingLeasesFutureMinimumPaymentsYearTwo" xlink:label="tw_OperatingLeasesFutureMinimumPaymentsYearTwo_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="tw_OperatingLeasesFutureMinimumPaymentsYearTwo_636939475684533873" order="2" use="optional" weight="1" priority="3" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_OperatingLeasesFutureMinimumPaymentsYearThree" xlink:label="tw_OperatingLeasesFutureMinimumPaymentsYearThree_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="tw_OperatingLeasesFutureMinimumPaymentsYearThree_636939475684533873" order="3" use="optional" weight="1" priority="3" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_OperatingLeasesFutureMinimumPaymentsYearFour" xlink:label="tw_OperatingLeasesFutureMinimumPaymentsYearFour_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="tw_OperatingLeasesFutureMinimumPaymentsYearFour_636939475684533873" order="4" use="optional" weight="1" priority="3" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_OperatingLeasesFutureMinimumPaymentsYearFive" xlink:label="tw_OperatingLeasesFutureMinimumPaymentsYearFive_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="tw_OperatingLeasesFutureMinimumPaymentsYearFive_636939475684533873" order="5" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_OperatingLeasesFutureMinimumPaymentsAfterYearFive" xlink:label="tw_OperatingLeasesFutureMinimumPaymentsAfterYearFive_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="tw_OperatingLeasesFutureMinimumPaymentsAfterYearFive_636939475684533873" order="6" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureIntangibleAssetsAndGoodwillFiniteLivedIntangibleAssetsTradewebMarketsLlcAndSubsidiariesDetails" xlink:type="extended" xlink:title="90502 - Disclosure - Intangible Assets and Goodwill - Finite Lived Intangible Assets (Tradeweb Markets LLC and Subsidiaries) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_636939475684533873" order="1" use="optional" weight="-1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="us-gaap_FiniteLivedIntangibleAssetsGross_636939475684533873" order="2" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureIncomeTaxesComponentsOfProvisionTradewebMarketsLlcAndSubsidiariesDetails" xlink:type="extended" xlink:title="90701 - Disclosure - Income Taxes - Components of Provision (Tradeweb Markets LLC and Subsidiaries) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="us-gaap_IncomeTaxExpenseBenefit_636923311452110467" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_IncomeTaxExpenseBenefit_636923311452110467" xlink:to="us-gaap_CurrentIncomeTaxExpenseBenefit_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="us-gaap_CurrentStateAndLocalTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CurrentIncomeTaxExpenseBenefit_636939475684533873" xlink:to="us-gaap_CurrentStateAndLocalTaxExpenseBenefit_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="us-gaap_CurrentForeignTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_CurrentIncomeTaxExpenseBenefit_636939475684533873" xlink:to="us-gaap_CurrentForeignTaxExpenseBenefit_636939475684533873" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_IncomeTaxExpenseBenefit_636923311452110467" xlink:to="us-gaap_DeferredIncomeTaxExpenseBenefit_636939475684533873" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="us-gaap_DeferredFederalIncomeTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_DeferredIncomeTaxExpenseBenefit_636939475684533873" xlink:to="us-gaap_DeferredFederalIncomeTaxExpenseBenefit_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="us-gaap_DeferredForeignIncomeTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_DeferredIncomeTaxExpenseBenefit_636939475684533873" xlink:to="us-gaap_DeferredForeignIncomeTaxExpenseBenefit_636939475684533873" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_DeferredIncomeTaxExpenseBenefit_636939475684533873" xlink:to="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_636939475684533873" order="3" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureNetIncomePerShareTradewebMarketsLlcAndSubsidiariesDetails" xlink:type="extended" xlink:title="91401 - Disclosure - Net Income Per Share (Tradeweb Markets LLC and Subsidiaries) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesIssuedBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesIssuedBasic_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="us-gaap_WeightedAverageNumberOfSharesIssuedBasic_636939475684533873" order="2" use="optional" weight="1" priority="2" />
  </calculationLink>
  <calculationLink xlink:role="http://www.tradeweb.com/role/DisclosureRegulatoryCapitalRequirementsTradewebMarketsLlcAndSubsidiariesDetails" xlink:type="extended" xlink:title="91501 - Disclosure - Regulatory Capital Requirements (Tradeweb Markets LLC and Subsidiaries) (Details)">
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_LiquidFinancialAssets" xlink:label="tw_LiquidFinancialAssets" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_ExcessLiquidFinancialAssets" xlink:label="tw_ExcessLiquidFinancialAssets_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="tw_LiquidFinancialAssets" xlink:to="tw_ExcessLiquidFinancialAssets_636939475684533873" order="1" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_RequiredLiquidFinancialAssets" xlink:label="tw_RequiredLiquidFinancialAssets_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="tw_LiquidFinancialAssets" xlink:to="tw_RequiredLiquidFinancialAssets_636939475684533873" order="2" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCapitalUnderCommodityExchangeActComputation" xlink:label="us-gaap_NetCapitalUnderCommodityExchangeActComputation" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCapitalExcessShortageUnderCommodityExchangeAct" xlink:label="us-gaap_NetCapitalExcessShortageUnderCommodityExchangeAct_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCapitalUnderCommodityExchangeActComputation" xlink:to="us-gaap_NetCapitalExcessShortageUnderCommodityExchangeAct_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RequiredNetCapitalUnderCommodityExchangeAct1" xlink:label="us-gaap_RequiredNetCapitalUnderCommodityExchangeAct1_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_NetCapitalUnderCommodityExchangeActComputation" xlink:to="us-gaap_RequiredNetCapitalUnderCommodityExchangeAct1_636939475684533873" order="2" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_RegulatoryCapital" xlink:label="tw_RegulatoryCapital" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_ExcessRegulatoryCapital" xlink:label="tw_ExcessRegulatoryCapital_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="tw_RegulatoryCapital" xlink:to="tw_ExcessRegulatoryCapital_636939475684533873" order="1" use="optional" weight="1" priority="2" />
    <loc xlink:type="locator" xlink:href="tw-20190331.xsd#tw_RegulatoryCapitalRequirement" xlink:label="tw_RegulatoryCapitalRequirement_636939475684533873" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="tw_RegulatoryCapital" xlink:to="tw_RegulatoryCapitalRequirement_636939475684533873" order="2" use="optional" weight="1" priority="2" />
  </calculationLink>
</linkbase>
