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 Question Thank you! Oops! Related Content Choosing a Business Structure Entrepreneurs all face the same question, “Which business structure should I adopt?” A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. Why do Renters Have to Save More? How much more would retirement cost if you owned your home rather than rented? It could actually be several times less.