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 Message Thank you! Oops! Related Content Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. Six Most Overlooked Tax Deductions Six overlooked tax deductions to help manage your tax bill. Filing Final Tax Returns for the Deceased The federal government requires deceased individuals to file a final income tax return.