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 Estate Management 101 A will may be only one of the documents you need—and one factor to consider—when it comes to managing your estate. Estimate Your RMD Help determine the required minimum distribution from an IRA or other qualified retirement plan. Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work.