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 | Related Content Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. What the New Tax Bill Means for You What does the Tax Reform and Jobs Act mean for you? Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one.