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 Surprise! You’ve Got Money! Here’s a quick guide to checking to see if you have unclaimed money. Contributing to an IRA? Determine if you are eligible to contribute to a traditional or Roth IRA. What's My Potential Estate Tax? This calculator helps estimate your federal estate tax liability.