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 Net Unrealized Appreciation (NUA) Explained Have you considered the special tax treatment on company stock held in a 401(k) plan? Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns.