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 Home Mortgage Deduction Use this calculator to assess the potential benefits of a home mortgage deduction. How Income Taxes Work A quick look at how federal income taxes work. Tax Freedom Day Assess how many days you'll work to pay your federal tax liability.