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. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content 18 Years’ Worth of Days The average retirement lasts for 18 years, with many lasting even longer. Will you fill your post-retirement days with purpose? The Richest Man in Babylon In good times and bad, consistently saving a percentage of your income is a sound financial practice. What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement.