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 | Related Content Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. Tax Rules When Selling Your Home The tax rules governing profits you realize from the sale of your home have changed in recent years. Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable.