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 Question Thank you! Oops! Related Content Data Breach: Your Security To-Do List This article provides a checklist of steps to take if you experience a data breach. Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Investing with Your Heart For some, the social impact of investing is just as important as the return, perhaps more important.