Debt Payoff Calculator
Enter every balance you owe and see the order to clear them in, the month you are debt free, and what the order costs — snowball against avalanche, side by side, on your own numbers.
- Updated Sep 2, 2026
- Reviewed by the BSF CPA Editorial Team
- US consumer debt
- 8 min read
Pay the minimum on everything, then put every spare dollar on one debt until it is gone — and when it goes, roll its payment onto the next. Which debt you pick first is the only real choice: the highest rate (avalanche) always costs less, the smallest balance (snowball) clears a debt sooner. On $18,400 across three debts with $250 spare, avalanche saves a few hundred dollars; on a wider spread of rates it can be thousands.
Enter each balance with its APR and minimum payment, add whatever you can pay beyond the minimums, and the calculator runs both orders.
Debt Payoff Calculator — Snowball or Avalanche
Put in every balance you owe and see the order to clear them in, how long it takes, and what each order costs.
Anything you can pay beyond the minimums. This is the money that does the work — with nothing spare, the order cannot change the outcome.
Leave a row at zero if you have fewer than five debts.
Your payoff plan
Snowball against avalanche
How to read your results
| Output | What it means | Why it matters |
|---|---|---|
| Debt free in | Months until every balance reaches zero, at the payment you entered. | The single number worth putting on the fridge. It moves further on the extra payment than on the order. |
| Total interest | What the debt costs you on top of what you borrowed. | This is the figure the payoff order actually changes. |
| Order cleared | Which debt goes first, second, and in which month. | Snowball's case rests entirely on how early that first zero arrives. |
| Avalanche saves | The interest difference between the two orders. | If it is small, pick the one you will actually stick to. If it is large, the arithmetic should win. |
Snowball or avalanche
Both methods do the same thing — minimums on everything, every spare dollar on one target, roll the freed payment onward — and differ only in which debt is the target.
Avalanche targets the highest interest rate. It is arithmetically optimal: no other order clears the debts for less interest, because every spare dollar is always attacking the most expensive balance. Where the rates are far apart — a 24% card next to a 6% car loan — the gap over the alternative is real money.
Snowball targets the smallest balance. It costs more, always, but it produces a cleared debt sooner, and one fewer statement each month is a genuine effect rather than a trick: the method people finish is better than the method they abandon in month four.
The argument is usually had in the abstract, and it does not need to be. The calculator reports both, on your balances. When the difference is a few hundred dollars over two years, pick the one you will keep doing. When it is several thousand, that is a strong reason to take the harder road.
The rolling payment is the mechanism
The reason either method beats paying minimums is not the order — it is that a cleared debt's payment does not go back into your spending. It joins the attack on the next one, so the money aimed at the remaining balances grows every time a debt falls, and the last one is cleared much faster than the first.
This is also the assumption most likely to break in real life. If the freed payment quietly becomes takeaway, the plan above is fiction. Both figures assume you keep paying the same total every month until the last balance is gone.
A worked example
Three debts: $6,200 on a card at 22.9% with a $155 minimum, $2,400 on a store card at 17.5% with a $60 minimum, and $9,800 on a car loan at 6.9% with a $195 minimum. Total owed, $18,400. You can find $250 a month beyond the minimums, so $660 a month goes out in total.
Avalanche puts the $250 on the 22.9% card, clears it, rolls its $155 onto the store card, then all of it onto the car loan. Snowball starts with the $2,400 store card, which is gone in a few months, and only then turns to the expensive card. Snowball's first win arrives much sooner; avalanche's total interest is lower. The calculator above is loaded with these figures, so both answers are on screen.
When the minimums are not enough
If the payments do not cover the interest, the balances grow no matter how the order is arranged, and the calculator says so rather than returning a number. It also states the shortfall — the amount per month at which the balances start falling instead of rising.
That situation is common and it is not a failure of arithmetic. The options are more money at the problem, a lower rate through a balance transfer or consolidation loan, or help: in the US, a non-profit credit counselling agency accredited by the NFCC will review a budget for free and can negotiate a debt management plan. It is worth doing before the balances compound further.
Common mistakes
- Treating the minimum as fixed. Card issuers usually recalculate the minimum as a percentage of the balance, so it falls as you pay down — which stretches the payoff. This calculator holds the minimum where you set it, which is what happens if you keep paying the same amount, and is the better plan anyway.
- Spending the freed payment. Rolling it forward is the whole mechanism. Skip it and the plan collapses to paying minimums.
- Chasing the order and ignoring the amount. The gap between snowball and avalanche is usually smaller than the gap between $150 a month extra and $300. Find the money first, then argue about the order.
- Leaving a promotional rate out of the picture. A 0% balance that reverts to 26% next March is not a low-rate debt. Enter the rate you will actually be paying over the plan.
Frequently asked questions
Which is better, snowball or avalanche?
Avalanche costs less in interest, always — it is the mathematically optimal order. Snowball clears an individual debt sooner, which some people need to keep going. Run both above: if the difference is small relative to the total, the method you will finish is the better one.
Does the calculator assume my minimum payment stays the same?
Yes. Real card minimums usually fall as the balance falls, which makes a minimums-only payoff slower and dearer than shown. Holding the payment steady is both the simpler model and the better plan.
Should I pay off debt or invest instead?
Compare the debt's rate with what you realistically expect to earn after tax. Clearing a 22% card is a guaranteed 22% return, which no investment offers reliably. A 4% mortgage is a different conversation.
Does consolidating into one loan help?
Only if the new rate, after fees, is genuinely lower and you do not run the cleared cards back up. Model the consolidated loan with the loan calculator and compare its total interest against the figure above.
What if I have more than five debts?
Combine the smallest ones that share a similar rate into a single row, using their total balance, their combined minimum, and the rate of the largest. The plan will be close, and the order between two 19% balances barely matters.
Methodology & sources
Each month, interest is charged on the balance at the start of the month at APR divided by twelve; minimum payments are applied to every live debt; everything remaining goes to the target debt under the chosen order, overflowing to the next when the target clears. The simulation runs both orders on every calculation, which is how the comparison is produced from the same inputs rather than from an estimate.
The figures ignore fees, promotional rates, changes in APR and any new borrowing, and no tax treatment is applied. They are a plan, not a quotation.
Related tools
- Loan Prepayment Calculator — the same question for one loan, with the interest saved and the months cut.
- Loan & Mortgage Calculator — what a consolidation loan would actually cost.
- Loan Eligibility Calculator — how much a lender would advance on your income and existing debts.
- Interest Rate Converter — what a quoted rate means once compounding is taken into account.
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