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. Related Content Inflation & Retirement Estimate how much income may be needed at retirement to maintain your standard of living. Caring for Aging Parents As our nation ages, many Americans are turning their attention to caring for aging parents. Yours, Mine, and Ours: Estate Strategies for Second Marriage Second marriages are a trigger event to revisit any existing estate strategies.