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 Consider Keeping Your Life Insurance When You Retire Reasons to retain your coverage into your retirement years. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government.