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 | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. How Income Taxes Work A quick look at how federal income taxes work. Home Mortgage Deduction Use this calculator to assess the potential benefits of a home mortgage deduction.