Free mortgage payoff calculator to evaluate options to pay off a mortgage earlier, such as extra payments, bi-weekly payments, or paying back altogether. Use our free mortgage calculator to easily estimate your monthly payment.See which type of mortgage is right for you and how much house you can afford. The mortgage payoff calculator helps you find out. Use this free Texas mortgage calculator to estimate your monthly mortgage payments and annual amortization. Mortgage Calculator. Calculators. Life experiment that compares paying off a mortgage early versus investing the same amount of money in the markets! Use SmartAsset's free Texas mortgage loan calculator to determine your monthly payments, including PMI, homeowners insurance, taxes, interest and more. Use this calculator to see how making extra payments affects how soon you can pay off your mortgage and how much interest you pay on your home loan. Use SmartAsset's free Texas mortgage loan calculator to determine your monthly payments, including PMI, homeowners insurance, taxes, interest and more.