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Debt Payoff Calculator (Snowball vs Avalanche)

Enter up to five debts and the total amount you can put toward debt each month. The calculator simulates both popular payoff methods, month by month, and shows which debt gets paid off first, when you will be debt-free, and how much interest you pay with each method.

How the snowball and avalanche methods work

Both methods start the same way: you pay the minimum on every debt each month, so nothing falls behind. Whatever money is left in your monthly debt budget becomes an "extra" payment. The two methods differ only in which debt gets that extra money.

With the debt snowball, the extra goes to the debt with the smallest balance. When it is paid off, its minimum payment rolls into the next-smallest balance, so the payment "snowballs" as you go. Small balances disappear fast, which gives you early wins and helps many people stay motivated.

With the debt avalanche, the extra goes to the debt with the highest interest rate (APR). You attack the most expensive debt first, so mathematically you pay the least interest and are usually debt-free a little sooner. The trade-off is that your first payoff can take longer if the high-rate debt also has a large balance.

How this calculator works

Each simulated month, the calculator adds one month of interest to every balance (APR ÷ 12), pays every minimum payment, and then sends all remaining budget to the target debt in snowball or avalanche order. When a debt reaches zero, its freed-up minimum becomes part of the extra payment for the next debt. It repeats until every balance is zero, then reports the number of months, the estimated debt-free month, total interest, and the order in which debts were cleared.

Real lenders compound interest slightly differently (often daily), and minimum payments on credit cards usually shrink as the balance falls. Treat the results as a close estimate for comparing the two strategies, not as an exact payoff quote.

Which method should you choose?

If the interest savings shown above are small (often the case when your rates are similar), choose the method you are most likely to stick with. For many people that is the snowball, because paying off a whole account in the first few months feels good and builds momentum. If the avalanche saves a meaningful amount, for example several hundred dollars or more, and you are confident you will keep going without quick wins, the avalanche is the cheaper route.

Whatever you choose, the biggest lever is the monthly budget itself. Try raising the budget by $50 or $100 in the calculator and watch how many months it removes. Even small increases shorten the timeline noticeably, because every extra dollar reduces the balance that interest is charged on.

Tips for using the results

• Use your real APRs from your statements, not estimates, because the rate drives the avalanche order.
• Include only debts you are actively paying down. A 0% promotional balance should be entered at 0% but watch the promo end date.
• Recalculate every few months with updated balances to stay on track.
• Keep a small emergency fund so a surprise expense doesn't go back on a card.

For a deeper walkthrough, read our guide Debt Snowball vs Avalanche: Spreadsheet Method.

FAQ

Is the snowball or avalanche method better?

The avalanche method usually costs less in total interest because it targets the highest APR first. The snowball method pays off small balances first, which many people find more motivating. If the difference in interest is small, pick the one you will stick with.

Does this calculator store my debt information?

No. All calculations run in your browser with JavaScript. Nothing you enter is sent to a server or saved.

Why does it say my budget is too low?

Your monthly budget must at least cover all minimum payments. If it doesn't, balances can't be guaranteed to go down, so increase the budget or check the minimums.

How accurate is the debt-free date?

It is an estimate based on monthly compounding and fixed minimum payments. Actual lender calculations can differ slightly, so use it to compare strategies and to plan.

This calculator is for general education and planning only. It is not financial, tax or legal advice. Check important decisions with a qualified professional.