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 Tax Freedom Day Assess how many days you'll work to pay your federal tax liability. Should I Buy or Lease an Auto? This calculator compares the financial impact of leasing versus buying an automobile. Who Is Your Trusted Contact? This investment account question is vital and answered as early as possible.