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Debt Snowball vs. Avalanche Calculator

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  2. Debt Snowball vs. Avalanche Calculator

Compare the Debt Snowball and Debt Avalanche Side by Side

Most comparisons of these two methods argue about which is better in the abstract. This one uses your actual balances, rates and minimum payments, runs both methods, and shows you the difference in dollars and months. Enter your debts below, add whatever extra you can pay each month, and you'll see exactly what the avalanche saves you — and how much sooner the snowball clears your first account. Everything runs right here in your browser: no signup required, and nothing is sent anywhere unless you choose to save your plan. Some example debt accounts have been added; edit, add or remove them as needed.

Debt name Balance APR % Min. payment
$
$0$1,000

Your two plans, compared

Debt Snowball
Smallest balance first		 Debt Avalanche
Highest rate first		 Difference
Debt-free date — — —
Months to payoff — — —
Total interest paid — — —
Total paid — — —
First debt cleared — — —

Both plans over time

Snowball    Avalanche    Minimum payments only

Payoff order

Same debts, same money, different order. This is the entire difference between the two methods.

Snowball order

#DebtAPRPaid offInterest

Avalanche order

#DebtAPRPaid offInterest

Month-by-month payment schedule

This is exactly where each dollar goes every month. Watch the payments roll: when a debt disappears, its column empties and the next debt's payment jumps.

Picked a method? Make it a real plan.

This calculator shows a snapshot. A free Undebt.it account keeps your plan updated every time you make a payment, tracks your progress, and lets you switch methods any time without losing your history.

Saves whichever method is selected above. Takes about a minute. No credit card needed. Your debts carry over automatically — no re-typing.

How the two methods differ

Debt SnowballDebt Avalanche
Pay off firstSmallest balanceHighest interest rate
Optimizes forMomentumTotal interest cost
First payoff arrivesSoonerLater, usually
Total interest paidHigher, usuallyLowest possible
Best whenYou've struggled to stay with a planYou have a large spread in rates

Everything else about the two methods is identical: pay every minimum, throw everything spare at one target debt, then roll that entire payment into the next debt when it clears. The only thing that changes is which debt sits at the front of the line.

Which one should you actually use?

The avalanche method always wins on paper. It is mathematically optimal — no ordering of the same payments against the same debts produces less interest. If arithmetic were the only thing that mattered, there would be nothing left to discuss.

What the arithmetic leaves out is whether you keep going. Paying off a whole account is the only unambiguous signal of progress a debt payoff plan produces, and the snowball delivers that signal sooner. Research on consumer debt repayment has found that people who clear small balances first are more likely to eliminate their debt entirely — not because the math is better, but because they stay with the plan.

So the useful question isn't which method is superior. It's how much the avalanche is actually worth in your case, and whether that amount is worth giving up an early win. Run the numbers above. If the avalanche saves you $2,000, that's worth some patience. If it saves you $60, take the momentum.

Want to work with just one method? The debt snowball calculator and the debt avalanche calculator each run the same engine with a full schedule and payoff chart. For the background on both, read how the debt snowball & avalanche methods work. Once you're signed up, there's plenty of help along the way — check out how Undebt.it works for more detail.

Frequently asked questions

The avalanche method, in almost every case — but usually by less than people expect. Both methods apply exactly the same total payment each month, so the only difference is the order of the targets. The gap widens when your interest rates are far apart and narrows to nothing when they're similar.

It depends entirely on the spread between your highest and lowest rates, and on how large those balances are. A 24% credit card sitting next to a 4% car loan produces a meaningful difference. Four cards between 19% and 22% produce almost none. The calculator above gives you your own figure rather than an average.

Because finishing matters more than optimizing. A plan that saves $300 in theory and gets abandoned in month five is worth less than one that costs $300 more and actually reaches zero. The snowball produces a completed payoff sooner, which is the clearest evidence of progress a plan can give you.

Then the two methods will produce nearly identical results and the choice doesn't matter much. Use the snowball — you get the same outcome plus an earlier win. The comparison above will tell you when this is your situation.

Yes, and it costs you nothing. The order of your remaining debts is simply recalculated from wherever you are. A common approach is starting with the snowball to clear one or two small accounts and build momentum, then switching to the avalanche once the plan has become a habit. A free Undebt.it account lets you flip between methods without losing any payment history.

Both simulations run the same engine with the same rules, so the comparison is always like-for-like. Each month interest accrues on every open balance, minimums are paid, and everything left over rolls onto the target debt. The only variable between the two runs is the payoff order.