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 Making Your Tax Bracket Work Have you explored all your options when it comes to managing your taxable income? How Income Taxes Work A quick look at how federal income taxes work. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one.