Debt Snowball Calculator

How the debt snowball method works

The debt snowball is a payoff strategy that orders your debts by balance, smallest first. Every month you make the minimum payment on all of them, then put every extra dollar toward the smallest balance until it is gone. When a debt is cleared, you take the payment you were making on it and roll it into the next-smallest balance. The amount you attack each debt with keeps growing, like a snowball rolling downhill.

The appeal is behavioral rather than mathematical. Clearing a debt entirely is a concrete, motivating win, and the snowball delivers those wins quickly by starting with the easiest balances. Behavioral research consistently finds that these early wins make people more likely to stay with the plan and actually become debt-free, even though the strategy ignores interest rates. This calculator simulates the plan month by month — accruing interest, paying minimums, then cascading the extra budget — and shows your payoff timeline, total interest, and the order debts are cleared.

The trade-off is that the snowball usually pays a little more total interest than the avalanche method, which targets the highest interest rate first. How much more depends on your balances and rates; often the gap is small. To help you decide, this tool shows the avalanche result side by side, so you can see exactly what the snowball’s motivational edge costs you in interest and time — and pick the approach you are most likely to finish.