Calculate your monthly payment for fixed rate or adjustable rate loans. A balloon mortgage is a real estate loan with a low or no monthly payment term that ends with the borrower paying off the complete total in one single sum.Find out if you can lower your interest rate and monthly payments with a Fulton refinancing loan. This tool figures a loan's monthly and balloon payments, based on the amount borrowed, the loan term and the annual interest rate. Balloon mortgages can be structured with varying terms and maturities and may have fixed or variable interest rates.