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 Saving for College This calculator can help you estimate how much you should be saving for college. 9 Facts About Retirement Regardless of how you approach retirement, there are some things about it that might surprise you. Contributing to an IRA? Determine if you are eligible to contribute to a traditional or Roth IRA.