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. A balloon mortgage can be an excellent option for many home buyers. See how this balloon mortgage calculator can help you. 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. A straight note is a written document that outlines the terms of a loan agreement between a borrower and a lender. Balloon Payment - Final installment payment of a promissory note larger than any single preceding installment payment.