Balloon Loan Calculator
Use this balloon loan calculator to find the monthly payment, the final balloon due, and the total interest on a loan with a large lump sum at the end.
What it does
The Balloon Loan Calculator works out the monthly payment on a loan that ends with one large final payment, the balloon. Because part of the debt is deferred to that lump sum, the monthly payment is lower than on a fully amortised loan.
Data sources & parameters
This calculator uses standard financial formulas and runs entirely in your browser. It needs no external rate data — your result is computed only from the values you enter above.
We always strive to use the latest data for every variable so our results and reports are as accurate as possible. Even so, errors are possible — you should not rely on this tool or its report alone, and we accept no liability for any decision made based on it.
The formula
payment = (principal − balloon ÷ (1 + i)^n) × i ÷ (1 − (1 + i)^−n), where i is the monthly rate and n the number of months
How it works
The present value of the balloon is subtracted from the loan amount, and only the remainder is amortised across the monthly payments at the monthly interest rate. The balloon itself is added back as a single amount due at the end of the term.
Where it is used
- Comparing a balloon loan against a standard amortising loan
- Checking whether the final lump sum is affordable or needs refinancing
- Seeing how a larger balloon lowers the monthly payment but raises total interest
Worked example
A borrower takes $30,000.00 at 7% over 5 years with a $10,000.00 balloon. The monthly payment is …, the balloon of … is due at the end, and total interest comes to ….
What the balloon loan calculator does
A balloon loan ends with one large final payment, the balloon, on top of the regular monthly instalments. Enter the loan amount, the annual interest rate, the term in years and the balloon payment, and this balloon loan calculator shows the monthly payment, the balloon due at the end and the total interest over the life of the loan. Set the balloon to zero and it works like a standard amortising loan, which is handy for comparison.
Balloon structures are common in car finance, some business equipment loans and certain commercial mortgages. They suit borrowers who want a lower monthly payment now and expect to be able to settle the lump sum later.
How a balloon loan works
An ordinary amortising loan pays the principal down to zero by the end of the term. A balloon loan leaves part of the principal unpaid, and that part is settled in a single payment when the term ends.
The calculator discounts the balloon to its present value at the loan's monthly rate, subtracts that from the loan amount, and spreads only the remainder over the monthly instalments. The balloon is then due as a lump sum at the end. This is how lenders price these loans and why the monthly payment is lower than on a standard loan of the same size.
The formula
payment = (principal − balloon ÷ (1 + i)^n) × i ÷ (1 − (1 + i)^−n)
i is the monthly interest rate (the annual rate divided by twelve) and n is the number of months. At a zero rate, the loan amount minus the balloon is spread evenly across the months. The total repaid is every monthly payment plus the balloon, and the total interest is that total minus the loan amount. A chart splits the total repayment into principal and interest.
Reading the results
The monthly payment is what you owe each month. The balloon due at the end repeats the lump sum you entered so it stays in view. The total interest is the full cost of borrowing and shows what the lower monthly payment costs. On a balloon loan the interest share of the chart tends to be larger than on an equivalent standard loan, because part of the principal stays outstanding and accrues interest until the balloon is paid. A higher rate raises both the payment and the interest; a longer term lowers the payment but stretches out interest.
When a balloon loan makes sense
A balloon can work if you have a reliable plan for the final payment: selling the car before the balloon falls due, expecting a lump of business revenue, or being confident you can refinance on good terms. It can also ease cash flow while other commitments are heavy, as long as you plan for the deferred amount.
The risks
The balloon has to be paid. If your plan depends on selling an asset whose value has fallen, refinancing after rates have risen, or income that has not arrived, you can be left short. A lender is under no obligation to refinance and may decline.
A balloon loan also generally costs more in interest than a standard loan over the same term, because more principal stays outstanding for longer. Run the calculator with the balloon at zero, note the total interest, then restore the balloon and compare; the difference is what the lower monthly payment costs you. Try larger and smaller balloons and the rates and terms you have been quoted. If the payment only becomes affordable with a very large balloon, the loan may be stretching your budget, and the problem is postponed, not solved.
About This Balloon Loan Calculator
Use this balloon loan calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.
Frequently asked questions
How does the balloon loan calculator work?
What is a balloon payment?
Why is the monthly payment lower with a balloon?
What happens when the balloon is due?
Does a bigger balloon cost more in total?
Is my data kept private?
About the author
