Debt Payoff Calculator: Snowball vs Avalanche, Debt-Free Date

How the debt avalanche and debt snowball methods work

Both methods start the same way. You pay the minimum on every debt, put any extra money on one target debt, and keep the total you pay each month the same. When the target is paid off, its minimum payment does not go back into your budget: it rolls over to the next debt on the list, so each debt gets paid faster than the one before it.

The only difference is the order. The avalanche goes after the highest APR first, so each extra dollar stops the most expensive interest. The snowball goes after the smallest balance first, so you close a first account sooner. The Consumer Financial Protection Bureau describes both: paying the highest rate first can save you money over time, while the snowball shows progress quickly but may cost more.

If your smallest debt also has the highest rate, the two orders are the same and so are the results. The calculator shows the other method's payoff time and interest under the result, so you can see what the choice costs on your own debts.

Snowball vs avalanche: a worked example

The calculator opens with three debts at the Federal Reserve's average rates from its G.19 report for August 2026: a $4,500 credit card at 22.36% (the average for card accounts charged interest) with a $135 minimum, a $2,400 personal loan at 11.90% (24-month loans) with a $113 payment, and a $9,500 car loan at 7.54% (60-month new car loans) with a $290 payment. With $200 extra, that is $738 a month toward $16,400 of debt.

The avalanche puts $335 a month on the card ($135 plus the $200 extra) and clears it in month 16. The card's $335 then joins the personal loan's payment and clears it in month 18, and everything goes to the car loan, which ends in month 25. The snowball starts with the personal loan instead, clears it in month 9, then the card in month 19 and the car loan in month 26.

$16,400 of debt, $738 a month	First debt paid off	Debt-free in	Total interest	Total paid
Avalanche (highest rate first)	Credit card, month 16	25 months	$1,978	$18,378
Snowball (smallest balance first)	Personal loan, month 9	26 months	$2,160	$18,560

The avalanche saves $182 and one month. The snowball gives you a paid-off account seven months earlier. Which one is right depends on whether $182 or an early win matters more to you, and on whether you will stick with the plan.

How long to pay off debt: what moves the date most

The amount you pay moves the date far more than the method. On the same three debts, going from no extra to $200 extra a month cuts the payoff by 13 months and saves $1,631 of interest. Switching methods at $200 changes it by one month and $182.

Extra each month	Avalanche	Snowball
$0	38 months, $3,608 interest	38 months, $3,608 interest
$100	30 months, $2,515 interest	30 months, $2,685 interest
$200	25 months, $1,978 interest	26 months, $2,160 interest
$300	22 months, $1,656 interest	22 months, $1,819 interest
$500	18 months, $1,270 interest	18 months, $1,397 interest

With no extra money the two methods match here, because the personal loan is paid off by its own payment in month 24 and both methods then send its $113 to the card. The rollover alone is worth a lot: if each debt simply ran on its own minimum, the card would take 53 months and the three debts would cost $4,076 of interest. Rolling each paid-off payment into the next debt ends it all in 38 months for $3,608.

A lower rate also helps: the FTC suggests telling your creditors what is going on and asking for a lower interest rate or a payment plan you can afford. To look at one card on its own, use the credit card payoff calculator. A mortgage usually has a lower rate and a much longer term than these debts, so it would come last under either method; to see what extra principal does on a home loan, use the extra mortgage payment calculator.

Questions

Is it better to pay off debt with the snowball or the avalanche method?

The avalanche (highest rate first) usually costs less interest, and the snowball (smallest balance first) pays off a first debt sooner. On $16,400 of card, personal loan and car debt with $200 extra a month, the avalanche saves $182 and one month.

How long will it take to pay off my debt?

It depends on how far your total monthly payment is above the interest your debts charge. Enter each balance, APR and minimum above to get your month; $16,400 of debt paid at $738 a month takes 25 months with the avalanche.

What happens to the minimum payment when a debt is paid off?

In both methods it rolls over to the next debt, so the total you pay each month stays the same. On the example debts, rollover alone with no extra money cuts the payoff from 53 months to 38.

Why does the calculator say my debt will never be paid off?

A payment at or below the monthly interest never reduces the balance. A $5,000 balance at 24% APR is charged $100 of interest in the first month, so a $90 payment lets it grow.

How is credit card interest calculated?

The CFPB says many card companies calculate interest daily, based on your average daily balance, using a daily periodic rate. This calculator charges APR divided by 12 on each month's balance, so your statements will differ a little.

Does the calculator lower my minimum payment as the balance falls?

No. It keeps each minimum fixed, the usual assumption of these calculators. Card minimums are often set at 1% or more of the balance plus that month's interest and fees, so they shrink as you pay; keep paying at least the starting amount to stay on this plan.

What does the minimum payment warning on my card statement mean?

Card statements must show how long it would take to pay off the current balance making only the minimum payment, and how much to pay each month to clear it in 36 months. Both assume you make no new charges.

Sources

Updated November 4, 2026. Estimates only, not tax or financial advice.