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 Content Perspectives on Tax Planning Too often, taxes are only thought of once or twice a year Five Most Overlooked Tax Deductions Five overlooked tax deductions to help manage your tax bill. Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable.