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 Question Thank you! Oops! Related Content Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Retirement Plan Detectives A couple become Retirement Plan Detectives, searching records from old employers. My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates.