The calculator will then generate an attractive, detailed report outlining the payments owed and the due dates. Balloon Payment Loan Calculator - With this balloon payment calculator you can get the monthly and balloon payment or just the balloon payment itself.This calculator computes the payment amount necessary for a mortgage with a balloon payment, using monthly interest compounding and monthly payments. At the end of your loan term you will need to pay off your outstanding balance. Use the balloon payment calculator to estimate the monthly payment and the final lump sum of a given balloon loan construction. This tool figures a loan's monthly and balloon payments, based on the amount borrowed, the loan term and the annual interest rate. To calculate a balloon payment using the BA II PLUS family calculator, please follow example listed below.