Snowball vs. Avalanche Calculator

Enter your debts once and see both methods run side by side on the same numbers.

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Your debts

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Both methods get the same extra payment — that's what makes the comparison fair.

Total going toward debt each month$0.00

Add at least one balance above to see both methods run on your numbers.

How to use this calculator

  1. 1Enter your debts once — balance, APR, and minimum payment for each. Both methods are run on the same list.
  2. 2Add the extra you can pay each month. Both columns receive the identical amount, which is what makes the comparison meaningful.
  3. 3Compare three numbers across the two columns: the debt-free date, the total interest, and the date the first debt disappears.
  4. 4Decide which of those numbers you care about most. The calculator does not pick for you, because the right answer depends on which one keeps you paying.

Comparing the two methods on the same debts

Snowball and avalanche are not different budgets or different levels of effort. They are the same monthly payment pointed in a different order. Every debt gets its minimum under both. The only decision either method makes is where the leftover money goes: to the smallest balance, or to the highest interest rate.

That single decision moves two numbers in opposite directions. Sorting by rate lowers the total interest. Sorting by balance brings the first cleared account forward. Most articles about this choice argue for one of those numbers in the abstract; the point of running both on your own debts is that you can see how large the gap actually is before deciding whether it is worth caring about.

Reading your own results

Three numbers are worth comparing across the columns. The debt-free date is usually close between the two, because your monthly payment is the same in both. The total interest is where the rate ordering earns its keep, and the gap scales with the spread between your rates. The first debt gone date is the one most calculators leave out, and it is the honest measure of what the snowball is buying — the difference between seeing something finish this year and waiting until next.

If those numbers come out close together, the choice does not matter much and you should pick whichever you will actually keep doing. If they come out far apart, you now know the price of the early win in dollars, which is a much better basis for a decision than anyone’s opinion about willpower.

What neither column can tell you

Both simulations assume every payment is made on time and no new debt appears. Neither accounts for a rate change, a promotional period ending, a fee, or a month where the payment does not happen. In practice the ordering matters far less than keeping the monthly total steady and not adding to the balances — a plan followed imperfectly in either order beats a perfectly ordered plan that stops.

Want the detail behind a single column? The debt snowball calculator and the debt avalanche calculator each show a full month-by-month schedule for their method.

Frequently asked questions

What is the actual difference between the snowball and the avalanche?
Only the order in which your extra payment is applied. The snowball aims it at the smallest balance; the avalanche aims it at the highest APR. Everything else is identical: every debt receives its minimum every month, the monthly total never changes, and when a debt is cleared, the money it was absorbing moves to the next debt in that method’s order.
Which method pays off debt faster?
Usually the avalanche, by a small margin, because less of your money goes to interest and more to principal. The gap is typically a month or two on an average consumer debt load and grows with the spread between your rates. Both columns above use your real numbers, so the answer for your debts is the one to trust over any general claim.
If the avalanche costs less, why does anyone use the snowball?
Because paying off debt takes years, and finishing matters more than optimizing. The snowball usually closes its first account within a few months, while the avalanche can spend a year or more on one large expensive balance before anything disappears. Some people need that early result to stay with the plan; others find the interest number more motivating. Both are represented above without a verdict, because the calculator cannot know which describes you.
Can I mix the two methods?
People often do — clearing one or two small balances for the momentum, then switching to strict rate order for the rest. This calculator models each method run cleanly from start to finish, so a hybrid lands somewhere between the two columns: a first win earlier than the avalanche shows, and total interest lower than the snowball shows.
Does the comparison include fees, promotional rates, or minimums that change?
No. It models balances, a fixed APR, and a fixed minimum payment for each debt. Annual fees, late fees, deferred-interest promotions that expire, variable rates, and card minimums that shrink with the balance are all outside what it simulates. Those factors affect both columns in much the same way, so the gap between the methods is more reliable than either absolute figure.
What if the two columns come out the same?
That happens more often than people expect, and it is genuinely useful information. If your smallest balance also carries your highest rate, both methods produce the same order and the same numbers. When that is the case, there is nothing to weigh up — either description of the plan is the plan.

Save this plan and track real progress

This calculator forgets everything when you close the tab. DebtWise keeps your plan, updates it as balances change, and shows what each extra payment does to your date — for $19 once, not a subscription.

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How the numbers are calculated

Interest accrues monthly at the APR you enter divided by twelve, applied to the balance at the start of each month. Each debt receives its minimum payment; anything left over in your monthly total goes to the debt at the top of the order, and a debt’s minimum payment is added to that pool once it is cleared. The simulation stops after 600 months (50 years), so a plan whose payments never cover the interest is reported as never reaching zero instead of getting a date. Both columns are simulated from the same debts with the same monthly total; the only difference is whether the leftover payment is sorted by balance or by APR.

Results are estimates. They assume every payment is made on time, no new debt is added, and rates, fees, and promotional periods stay unchanged — real accounts vary in how they compound interest and apply payments, so your lender’s figures will differ somewhat.

This calculator is an educational tool, not financial advice, and using it does not create an advisory relationship. See our Terms of Use.

Built by DebtWise, a debt-payoff and budgeting app. The math here is the same engine that powers the app’s planner.

Last updated .