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. Under this arrangement, the borrower pays interest on an annual basis to the lender and makes a balloon payment of principal at the end of the payment term. Balloon Loan Payment Calculator. Here's the information you'll need to have handy to complete your secured promissory note, installment with balloon final payment. Monthly payments are based on a 10year amortization with a balloon payment due at maturity.