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 Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Tax Efficiency in Retirement What role would taxes play in your investment decisions? The Financial Literacy Crisis Many Americans are operating their personal finances with only the barest minimum of knowledge.