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 Can I Refinance My Mortgage? This calculator can help determine whether it makes sense to refinance your mortgage. Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Tax Freedom Day Assess how many days you'll work to pay your federal tax liability.