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 Lifetime of Earnings Estimate how much you have the potential to earn during your working years. Should You Invest in Exchange Traded Funds? There are hundreds of ETFs available. Should you invest in them? 3 Ways to Save Without Tax Deferral Tax deferral versus tax-efficient vehicles like Roth 4019k)s, Roth IRAs and Life Insurance.