Snowball vs. avalanche: which pays off debt faster?
Two proven strategies attack debt in opposite orders. The avalanche targets your highest interest rate first to minimize interest paid; the snowball knocks out your smallest balance first for quick, motivating wins. Enter your debts and any extra monthly payment to see the payoff date and total interest for each — and exactly what the difference costs. Everything runs in your browser — nothing is uploaded.
A simplified projection, not financial advice. It assumes fixed balances, fixed APRs, level minimum payments, and that your total monthly payment (all minimums plus the extra) stays constant — so as each debt is cleared, its payment rolls onto the next. It does not model new charges, fees, promotional 0% periods that expire, or minimum payments that change with the balance.
Debt snowball vs. debt avalanche
Both methods pay every debt's minimum each month and throw all spare cash at one target debt. When that debt is gone, its payment "rolls over" to the next target, so your payoff accelerates. The only difference is which debt you target first:
- Avalanche: highest interest rate first. This mathematically minimizes total interest and usually clears all debt soonest.
- Snowball: smallest balance first. You eliminate individual debts quickly, which builds momentum and motivation even if it costs a little more interest.
Which method should you choose?
If your debts have wildly different interest rates — say a 24% credit card next to a 6% student loan — the avalanche can save real money and is the clear pick. If your balances and rates are similar, the two methods finish close together, and the snowball's psychological wins can be worth more than the small interest difference. The best method is the one you'll actually stick with.
Why an extra payment matters so much
Minimum payments are designed to keep you in debt for years. Even a modest extra amount each month — applied consistently to one debt at a time — can cut your payoff timeline dramatically and save thousands in interest, because every extra dollar goes straight at principal instead of feeding next month's interest. Try changing the extra payment above and watch both the payoff date and total interest move.
Tips to pay off debt faster
- List every debt with its balance, APR, and minimum so nothing hides.
- Always pay at least the minimum on every debt to protect your credit.
- Send every spare dollar to a single target debt, not spread thin.
- Roll each cleared payment onto the next debt — don't absorb it back into spending.
- Consider pausing investing beyond any employer match while attacking very high-interest debt.
Frequently asked questions
Does the avalanche always save the most money?
In pure interest terms, yes — targeting the highest APR first minimizes the interest you pay and usually clears all debt at least as fast as the snowball. The snowball can tie or come very close when balances are similar, and it wins on motivation by eliminating whole debts sooner.
How does the payoff date get calculated?
The calculator simulates your debts month by month. Each month it adds interest, pays every minimum, then applies all remaining money to the target debt for that strategy. It counts the months until every balance reaches zero and projects that onto a calendar date from today.
Why might my debt never pay off?
If a debt's minimum payment is smaller than its monthly interest and you add no extra, the balance can grow instead of shrink. The calculator flags this. Adding an extra payment, or raising the minimum above the monthly interest, is the way out.
Should I pay off debt or invest?
A common rule of thumb: capture any employer 401(k) match first, then aggressively pay debt whose interest rate is higher than your expected investment return — high-interest debt is a guaranteed "return" you can't beat reliably. Planomy's full app can weigh debt payoff against investing inside one plan.
See debt payoff inside your whole plan
Free, private, and running entirely in your browser. Model your debts, savings, and retirement together — and track plan vs. actual — no account required.