Avalanche against snowball, what the choice is actually worth, and the two things that decide the outcome instead. General information, not personalized financial advice.
Both methods start the same way: pay every minimum, every month, on every debt. That part is not optional and not a strategy. Whatever you can afford beyond the minimums goes to one debt at a time, and the only question is which one.
The avalanche targets the highest interest rate. The snowball targets the smallest balance. Both rely on the same engine, which is the part worth understanding: when a debt is cleared, its minimum payment does not disappear from your budget — it joins the extra going to the next target. Each payoff makes the next one faster, which is where the snowball got its name, and the avalanche does exactly the same thing.
Here is what nobody mentions. In 20,000 simulated debt sets, the two methods produced an identical plan 22% of the time. That is not a coincidence: the debts with the highest rates are very often the smallest ones. A store card at 28% carries a few hundred dollars; a car loan at 7% carries fifteen thousand. When the priciest debt is also the smallest, both methods point at it, and the whole debate evaporates before you have made a decision.
So the first thing to do is not to pick a philosophy. It is to write down every balance, rate and minimum, and look at whether the two orderings differ at all. The debt payoff calculator will run both and show you.
In the 78% of cases where the orderings differ, paying the highest rate first saved a median of 9.6% of the total interest and about one month. The tail is not trivial, though: in the worst tenth of cases the snowball cost 26% more interest, and at the extreme it cost 43% more. Those are the situations where one large balance carries the highest rate while a couple of small cheap debts sit in front of it.
A concrete one. Three cards — $12,000 at 24%, $1,500 at 11%, $2,600 at 9% — with $300 a month beyond the minimums:
| Method | Order | Months | Interest |
|---|---|---|---|
| Avalanche | 24% → 11% → 9% | 29 | $4,186 |
| Snowball | $1,500 → $2,600 → $12,000 | 31 | $5,175 |
| Minimums only | — | 82 | $13,285 |
The avalanche saves $989 against the snowball. Both save around $9,000 against doing neither. That ratio is the entire point of this page: the gap between the two methods is roughly a tenth of the gap between using one and using none.
The case for the snowball has never really been financial. It is that clearing a whole debt early is motivating, and a plan you keep beats a better plan you abandon. That is a real argument and this page will not pretend to settle it — but it should be made with the price tag visible, and the price tag is usually about 10% of the interest.
Issuers typically set the minimum at around 1% of the balance plus that month's interest and fees, or a flat floor of $25 to $35, whichever is larger. Read that formula again: it is the interest, plus about a hundredth of what you owe. It is constructed so that paying it keeps the account in good standing while barely touching the principal.
Take $6,400 at 22.15%, which is the average rate on US card accounts that are actually charged interest. On minimums alone that takes 222 months — eighteen and a half years — and costs $10,315 in interest, more than the balance itself. The first payment is $182, of which $118 is interest: 65 cents of every dollar buys nothing.
Now add $100 a month. The same debt clears in 48 months and costs $2,717. That single change saves $7,598 and fourteen and a half years, and it does not require choosing a method, a philosophy or a side.
One thing to check before anything else: if a card's minimum is smaller than one month's interest — which happens on a low flat floor with a large balance — the balance grows no matter how long you pay it. The calculator flags that per debt, because it is a fact about a single card rather than about a strategy.
The standard warning is to watch the transfer fee, typically 3% to 5% of the amount moved. That warning is aimed at the wrong number. A 4% fee paid once against a 22% rate charged every year is not a close call — hold the monthly payment constant and the transfer wins in every scenario we modelled, by between $1,000 and $4,500.
The trap is that moving the balance lowers the minimum payment, because the interest component of it drops to nothing. If you let your payment fall to the new minimum, the same transfer turns into a different outcome entirely:
| $6,400 moved, 4% fee, 0% for 18 months | Months | Total cost |
|---|---|---|
| Keep paying $356 a month | 19 | $261 |
| Pay the new minimum instead | 226 | $9,010 |
Same card, same fee, same promotional rate, $8,750 apart. Paying the minimum through an interest-free window is the most expensive thing you can do with one: after eighteen months of owing no interest at all, $5,555 of the original $6,400 is still outstanding, and the rate comes back.
So the question to ask of a transfer offer is not what it costs. It is whether you will divide the balance by the number of promotional months and pay that, every month, regardless of what the statement asks for. If yes, take it. If you are not sure, the offer is a way of turning a payment you were making into one you are not.
The method was worth a median $111 across 20,000 simulations. Paying extra at all was worth $6,424. Choose the avalanche because it is free, then stop thinking about it and go find the extra payment, which is where the money is.
It is never cheaper, but 22% of the time it is identical, and when it is worse the median cost is about 10% of the interest. Calling it a mistake overstates a real but modest gap — and a method someone actually sticks to beats a better one they drop.
A one-time 4% against an annual 22% is not the risk. The risk is that the required payment falls and yours falls with it. Same transfer, same fee: $261 if the payment holds, $9,010 if it does not.
Against a card rate this is not a close comparison. Clearing 22% debt is a guaranteed, tax-free 22% return on every dollar. The argument has real force against a 4% student loan or a 3% mortgage; it has none against a credit card.
The two median savings figures come from the same 20,000 simulations, run on this site's own payoff engine. The rate is the Federal Reserve's May 2026 figure for accounts assessed interest; the average across all accounts, including those paid in full monthly, is 20.94%.
Nothing is saved or sent anywhere; this just checks your answers in the page itself.
The 20,000 simulated debt sets are randomly generated within realistic ranges — two to five debts, balances from $400 to $25,000, card rates from 15% to 30% and loan rates from 4% to 9% — and are an illustration of how often and by how much the two methods diverge, not a survey of real households. A different mix of debts would shift the medians. Promotional transfer terms, fees and reverting rates vary by offer and are set by the issuer, not by this page. This is general information, not financial advice.