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. What Do Your Taxes Pay For? Here's a breakdown of how the federal government spends your tax money. Six Most Overlooked Tax Deductions Six overlooked tax deductions to help manage your tax bill.