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 Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Four Really Good Reasons to Invest There are four very good reasons to start investing. Do you know what they are? Risk Perspective Is it possible to avoid loss? Not entirely, but you can attempt to manage risk.