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 Home Ownership by the Numbers Tips on home-buying for Millennials. When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits. What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement.