What's the difference between the avalanche and snowball methods?

The avalanche method pays off debts in order of highest interest rate first, which minimizes total interest paid and is mathematically optimal. The snowball method pays off debts in order of smallest balance first, which builds momentum through quick early wins. Both methods keep paying the minimum on every debt, then throw all extra payment at the current priority debt.

Which method should I use?

Avalanche saves the most money and time in almost every case, so it's the better choice if you're purely optimizing the math. Snowball can be more effective in practice for some people because early payoffs create a visible sense of progress that helps sustain motivation — the 'best' method is often whichever one you'll actually stick with.

How is the payoff time calculated?

Each month, interest accrues on every remaining balance, then the minimum payment is applied to every active debt. Any money left over — your extra payment plus the minimum payments freed up from already-paid-off debts — goes entirely toward the current priority debt, in either avalanche or snowball order, until every balance reaches zero.

Why does my minimum payment amount matter so much?

If a minimum payment doesn't cover a debt's monthly interest charge, the balance grows instead of shrinking, and it can never be paid off no matter how long you wait — this calculator flags that case. Even when minimums do cover interest, low minimums mean more of the payment goes to interest instead of principal, which is why extra payments matter so much for high-interest debt.

Does the order I add debts in matter?

No. The calculator automatically re-sorts your debts by APR (avalanche) or balance (snowball) regardless of the order you enter them in — you can list them in whatever order is easiest for you.

What counts as an 'extra' payment?

Any amount you pay beyond the combined minimum payments on all your debts. It's applied entirely to the single highest-priority debt each month, rather than being spread evenly across every balance, which is what makes both the avalanche and snowball methods faster than paying only minimums.

Does this calculator account for balance transfers or refinancing?

No — it models paying down your debts exactly as entered, at their current interest rates. If you're considering a balance transfer card or a debt consolidation loan, re-run the calculator with the new rate and balance to compare the payoff timeline against your current plan.

Is my data stored anywhere?

No. All calculations run locally in your browser. Nothing you enter is transmitted to a server or stored.

AI Insights

Debt Payoff Calculator

Find out how fast you can become debt-free using the avalanche or snowball method, with total interest paid and a month-by-month payoff order.

Last updated August 9, 2026

Your debts

Balance ($)

APR (%)

Min payment ($)

Balance ($)

APR (%)

Min payment ($)

Extra monthly payment ($)

Payoff strategy

Debt-free in

2 yr 9 mo

$2,456 in total interest

Payoff order

1. Credit cardPaid off in 1 yr 5 mo
2. Car loanPaid off in 2 yr 9 mo

Tackling debt over a multi-year horizon requires sustained momentum, and the avalanche method keeps interest costs as low as possible by targeting your highest-rate balances first. Because you are several years away from the finish line, putting even a small extra amount toward your current priority balance can noticeably shorten your overall timeline. Staying consistent with this mathematical approach guarantees you will pay the absolute minimum in total interest charges before your balances reach zero.

AI-generated insight

Year-by-year remaining balance

Year	Remaining balance
1	$11,153
2	$4,943

How to use the debt payoff calculator

1
Add each debt's balance, APR, and minimum payment.
2
Enter any extra monthly payment you can put toward debt beyond the combined minimums.
3
Choose avalanche or snowball — your debt-free date, total interest, and payoff order update instantly.

Avalanche vs. snowball — how the payoff order works

Once a debt is paid off, its minimum payment rolls into extra payment on the next debt — the total monthly budget never changes, only where it's aimed.

Both methods keep paying the minimum on every debt every month. The difference is entirely about which single debt gets all the extra money — avalanche targets the highest APR first, while snowball targets the smallest balance first.

Worked example: a $10,000 balance at 26% APR ($250 minimum) and a $1,500 balance at 6% APR ($60 minimum), with $200 extra per month. Avalanche pays off both debts in 31 months, paying $3,886 in total interest. Snowball pays off the small $1,500 balance first for an early win, but takes 32 months and $4,318 in total interest — about $432 more, because the large high-interest balance keeps accruing interest for one extra month before getting full priority.

Avalanche is mathematically optimal in essentially every case. Snowball can still be the better real-world choice if quick, visible wins are what keep you consistent — the calculator shows both side by side so you can see exactly what the difference costs.

Why extra payments matter so much

Paying only the minimum on a high-interest debt can take years longer and cost far more in interest than a relatively small extra payment would save. That's because minimum payments on revolving debt like credit cards are often calculated to barely outpace the interest charge itself — most of an early minimum payment goes to interest, not principal.

Any extra amount you add goes straight to principal on the priority debt, which both shrinks the balance faster and reduces the interest that accrues on it every following month — a compounding effect in your favor. Even a modest extra payment can cut months or years off a payoff timeline.

If your goal is longer-term wealth building once your high-interest debt is gone, model what that freed-up monthly payment could grow into with our Compound Interest Calculator.

See how paying down this debt shifts your bigger picture with our Net Worth Calculator → — every dollar of debt paid off is a dollar of net worth gained.

Frequently asked questions

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