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 Social Security: The 64,000 Dollar Question One of the most common questions people ask about Social Security is when they should start taking benefits. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Career With a Special Needs Child Women and the life-work juggling act.