Mortgage Early Payoff Calculator View Calculator How much additional would you need to pay each month to pay off your mortgage in a certain number of years and months? Run this calculator to find out. Enter your mortgage balance, the principal and interest amount of your current monthly payment, the interest rate, and the desired number of years and months to have it paid and this calculator will show you how much additional you must pay each month to meet that payoff time. It also shows how much time and money you will save by paying early vs. paying as scheduled. Learn more about putting this calculator or other calculators on your website.