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 shorter amortization schedule means you save on interest but need to pay more each month.It all comes down to what you can afford. Monthly principal and interest payment (PI). The monthly payment is calculated using the number of payments in the selected amortization period. A balloon mortgage can be an excellent option for many home buyers, use this calculator to see if a balloon mortgage might fit your needs. The Balloon Payment Calculator allows users to compare previously entered data with other financing scenarios. 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 mortgage is one of many loan types you can get to buy a home. Balloon loans are short-term loans that provide the benefit of low monthly payments.