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 Retirement Plan Detectives A couple become Retirement Plan Detectives, searching records from old employers. A Penny Saved is Two Pennies Earned Here are some simple and inexpensive energy-saving tips that may help you save money. From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history.