Balloon Payment Loan Calculator - With this balloon payment calculator you can get the monthly and balloon payment or just the balloon payment itself. 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. Use the balloon payment calculator to estimate the monthly payment and the final lump sum of a given balloon loan construction. This calculator computes the payment amount necessary for a mortgage with a balloon payment, using monthly interest compounding and monthly payments. Balloon Loan Payment Calculator. A straight note is a written document that outlines the terms of a loan agreement between a borrower and a lender. There shall not be a balloon payment due before the maturity date of the Program loan. 5.3.