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 Contents Making Your Tax Bracket Work Have you explored all your options when it comes to managing your taxable income? Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable.