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 Message Thank you! Oops! Related Content Your DNA Test Preparing for the unexpected can make all the difference if your family relies on your income. How Income Taxes Work A quick look at how federal income taxes work. What Do Your Taxes Pay For? Here's a breakdown of how the federal government spends your tax money.