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? Address Thank you! Oops! Related Contents Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. Six Most Overlooked Tax Deductions Six overlooked tax deductions to help manage your tax bill. Tax Management Strategies Learn more about taxes, tax-favored investing, and tax strategies.