Debt Snowball Calculator
The Debt Snowball method helps you pay off multiple debts by tackling the smallest balance first while making minimum payments on all others. As each debt is eliminated, you roll that payment into the next one, creating a growing momentum — a snowball effect — that accelerates your path to becoming debt-free.
The Debt Avalanche method is an alternative strategy that targets the highest-interest debt first, minimizing the total interest you pay over time. Both methods are supported here: enter your debts, set any extra monthly amount you can afford, and instantly see the recommended payoff order along with estimated months and total interest for each debt.
How it works
Snowball: sort debts by balance (ascending) and attack the smallest first. Avalanche: sort by APR (descending) and attack the highest rate first. After each debt is cleared, add its minimum payment to the next debt's payment. Months to payoff: n = ⌈log(P / (P − r·B)) / log(1 + r)⌉, where B = balance, r = monthly rate (APR/12), P = monthly payment.
Use cases
- Creating a realistic debt payoff plan for credit cards and personal loans
- Comparing the snowball and avalanche strategies to choose the best fit
- Calculating how much extra monthly payment reduces your debt-free date
- Estimating total interest paid under different payoff scenarios
- Motivating consistent payments by visualizing a clear payoff order
Frequently asked questions
How does the debt snowball method work?
You make the minimum payment on every debt, then direct all extra money toward the debt with the smallest balance. Once that debt is paid off, its entire payment rolls into the next-smallest one, so the amount attacking each remaining debt keeps growing like a snowball.
What is the difference between the debt snowball and the debt avalanche?
The snowball orders debts by balance from smallest to largest, giving you quick wins that build motivation. The avalanche orders them by interest rate from highest to lowest, which minimizes the total interest you pay. Both methods are supported by this calculator so you can compare the results side by side.
Which method saves more money, snowball or avalanche?
Mathematically the avalanche method usually saves more, because it eliminates the highest-APR debts first and therefore reduces total interest. The snowball can still be the better choice in practice if the early wins help you stay consistent with your payments.
How is the number of months to pay off a debt calculated?
The calculator uses n = log(P / (P − r·B)) / log(1 + r), rounded up, where B is the balance, r is the monthly rate (APR divided by 12), and P is the monthly payment. If the payment barely covers the monthly interest, the payoff time grows very quickly, which is why extra payments matter so much.
Does paying a small extra amount each month really make a difference?
Yes. Any amount above the minimum payments goes straight to reducing principal, which shortens the payoff timeline and cuts the interest charged in every following month. Enter different extra amounts in the calculator to see exactly how many months each scenario saves.