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. Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content Principles of Preserving Wealth How federal estate taxes work, plus estate management documents and tactics. Contributing to an IRA? Determine if you are eligible to contribute to a traditional or Roth IRA. What's New for Social Security? There have been a number of changes to Social Security that may affect you, especially if you are nearing retirement.