Debt Snowball Payoff Calculator
The debt snowball method builds momentum by adding extra money to your payments. This calculator estimates how many months it takes to clear a debt and how much interest you pay along the way.
How it works
The debt snowball method combines your minimum payment with an extra amount (your snowball) to pay down a debt faster. Each month, interest is added based on your APR: monthly interest = balance × (annual rate ÷ 12).
This calculator applies your total monthly payment, subtracts it from the balance after adding interest, and repeats until the balance reaches zero. It tracks the number of months, total interest, and total amount paid.
The classic snowball strategy focuses extra cash on your smallest balance first. Once it's cleared, you roll its payment into the next debt — building momentum like a rolling snowball.
Tips
List all your debts smallest to largest and attack the smallest first for quick wins and motivation.
Whenever you free up a payment by clearing a debt, add that full amount to your next target — never reduce your total monthly outlay until you're debt-free.
FAQ
What is the difference between snowball and avalanche?
The snowball method pays the smallest balance first for psychological wins, while the avalanche method targets the highest interest rate first to minimize total interest. Snowball often keeps people more motivated.
Why does my payment need to exceed the interest?
If your monthly payment is less than or equal to the monthly interest charge, the balance never shrinks. You must pay more than the interest each month to make progress.
Does paying extra really help that much?
Yes. Extra payments go straight to principal, reducing the balance interest is calculated on. Even a small extra amount can cut months or years off your payoff time and save significant interest.