Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content How Cash Apps Work Peer-to-peer payment apps are one of the newest ways to send money. Dreaming Up an Active Retirement When you retire, how will you treat your next chapter? How Income Taxes Work A quick look at how federal income taxes work.