This tool figures a loan's monthly and balloon payments, based on the amount borrowed, the loan term and the annual interest rate. A balloon loan is usually rather short, with a term of three to five years, but the payment is based on a term of up to 15 years.This calculator computes the payment amount necessary for a mortgage with a balloon payment, using monthly interest compounding and monthly payments. Use the balloon payment calculator to estimate the monthly payment and the final lump sum of a given balloon loan construction. Do you need help understanding your debt financing terms?