Which strategy should I actually choose?

Avalanche always costs less in interest, because paying the highest rate first is mathematically optimal. Snowball can still be the better choice if the motivation from clearing a debt early is what keeps you paying at all. A plan you abandon saves nothing regardless of how efficient it was.

Why did one of my debts disappear from the plan?

Debts with a zero balance or a zero minimum payment are filtered out before the calculation runs. If a debt is missing from your result, check that both fields have real numbers in them.

Can I see both strategies at once?

No, the tool calculates one at a time. Run avalanche, note the months and the interest, then switch the dropdown to snowball and run it again. The comparison is worth the extra thirty seconds.

Does it handle interest-free debts correctly?

Yes. A debt entered at 0% accrues no interest in the simulation, which is exactly why avalanche pushes it to the back of the queue. Under snowball a small interest-free debt can be paid first, which costs you interest elsewhere.

What if my payments are too small to ever clear the debt?

The simulation stops after 600 months, or fifty years. If your result is near that ceiling, the plan does not work with the payments entered and the realistic options are increasing the payment or seeking advice from a nonprofit credit counsellor.

Does it account for new borrowing or rate changes?

Neither. Balances, rates and minimums are fixed for the whole projection. New spending on a card, a promotional rate expiring, or a variable rate moving will all push the real timeline past what is shown.

Debt Payoff Calculator: Avalanche vs Snowball Method

Debt Payoff Calculator: Avalanche vs Snowball MethodThe Debt Payoff Calculator is a free browser-based tool that takes a list of debts and a single extra monthly payment and simulates clearing them under either the avalanche or the snowball strategy. Avalanche attacks the highest interest rate first and mathematically minimises interest. Snowball attacks the smallest balance first and produces faster early wins. Both pay every minimum every month and direct the extra payment at whichever debt sits first in the strategy order. The tool runs one strategy per calculation, so comparing them means running it twice and reading the two results side by side.

What people use it for

Choosing between the two strategies with your own numbers

A household with a credit card at 24%, a car loan at 5% and a medical bill at 0% runs both strategies. Avalanche clears everything in 26 months for about $2,419 of interest, while snowball takes 32 months and about $4,237 because the expensive card is paid last. Seeing an $1,818 difference makes the trade-off concrete.

Discovering the strategies agree

Sometimes the smallest balance also carries the highest rate, in which case both strategies produce an identical order and identical results. Running both and finding the same answer removes the decision entirely, and is worth checking before agonising over the choice.

Deciding how much extra is worth committing

Running the same debts with $100, $300 and $500 of extra payment shows how the debt-free date moves. Extra payments compound in effect because each cleared debt frees its minimum for the next one, so the relationship is steeper than most people expect.

Working out whether a consolidation offer helps

Model the current debts to get a baseline interest figure, then compare it against the total cost of the consolidation loan including any fee. If the consolidated cost is higher, the offer is buying convenience rather than savings.

How it works

Add every debt Each debt needs a name, a balance, an APR and a minimum payment. Use Add debt for as many as you carry, and delete any row you do not need using the button beside its name.
Check your minimum payments A debt with a minimum payment of zero is silently excluded from the calculation, as is one with a zero balance. Enter a real minimum for every debt you want the plan to cover.
Set your extra monthly payment This is what you can pay above the sum of all minimums. It is applied entirely to the first debt in the strategy order, then rolls to the next once that debt is cleared.
Choose avalanche or snowball Avalanche sorts by APR from highest to lowest. Snowball sorts by balance from smallest to largest. The choice only changes the order, never the amount you pay each month.
Press Calculate Payoff Plan You get the debt-free timeline in years and months, the projected calendar month you finish, and total interest paid across the whole plan under the strategy you chose.
Run it again with the other strategy Switch the dropdown and recalculate to see the alternative. Write down both totals, because the tool shows one result at a time and does not keep the previous run.

Worked examples

Input: Credit card $5,000 at 22% with a $150 minimum, car loan $12,000 at 6% with $280, personal loan $8,000 at 11% with $200, plus $300 extra per month.

Result: Both strategies return 3 yr 1 mo, 37 months, and about $3,251 of interest. The smallest balance also carries the highest rate here, so avalanche and snowball produce the identical order.

Input: Credit card $9,000 at 24% with a $250 minimum, car loan $6,000 at 5% with $180, medical bill $2,000 at 0% with $75, plus $300 extra per month. Run under avalanche.

Result: Debt-free in 2 yr 2 mo, 26 months, with about $2,419 of interest. The extra payment goes to the 24% card first, where it displaces the most expensive interest.

Input: The same three debts and the same $300 extra, run under snowball.

Result: Debt-free in 2 yr 8 mo, 32 months, with about $4,237 of interest. Clearing the interest-free medical bill first feels like progress but saves nothing, and the 24% card compounds meanwhile.

Frequently asked questions

Which strategy should I actually choose?: Avalanche always costs less in interest, because paying the highest rate first is mathematically optimal. Snowball can still be the better choice if the motivation from clearing a debt early is what keeps you paying at all. A plan you abandon saves nothing regardless of how efficient it was.
Why did one of my debts disappear from the plan?: Debts with a zero balance or a zero minimum payment are filtered out before the calculation runs. If a debt is missing from your result, check that both fields have real numbers in them.
Can I see both strategies at once?: No, the tool calculates one at a time. Run avalanche, note the months and the interest, then switch the dropdown to snowball and run it again. The comparison is worth the extra thirty seconds.
Does it handle interest-free debts correctly?: Yes. A debt entered at 0% accrues no interest in the simulation, which is exactly why avalanche pushes it to the back of the queue. Under snowball a small interest-free debt can be paid first, which costs you interest elsewhere.
What if my payments are too small to ever clear the debt?: The simulation stops after 600 months, or fifty years. If your result is near that ceiling, the plan does not work with the payments entered and the realistic options are increasing the payment or seeking advice from a nonprofit credit counsellor.
Does it account for new borrowing or rate changes?: Neither. Balances, rates and minimums are fixed for the whole projection. New spending on a card, a promotional rate expiring, or a variable rate moving will all push the real timeline past what is shown.

Tips

Run both strategies before committing. When the ordering happens to be the same, the decision disappears and you can just start.
Keep paying the freed-up minimum after a debt clears rather than absorbing it into spending. That rollover is what makes either strategy accelerate.
Enter the real minimum from each statement rather than a round number. Minimums drive the whole simulation and a rough guess distorts the timeline.
Recalculate every few months as balances fall. The optimal order can shift once one debt is nearly cleared.

Written by Ahsan Mahmood. Last updated 2026-07-21. This calculator runs entirely in your browser and produces estimates, not tax advice.TaxEase — Debt Payoff Calculator: Avalanche vs Snowball Method