Avalanche vs. Snowball (One Debt at a Time)
Two popular strategies — this tool models one balance
Most households owe several things at once: a card, a car, maybe a student loan. This calculator handles one balance, which is actually a good match for how payoff plans work — you attack one debt while paying minimums on the rest.
The two orderings
The avalanche method targets the highest interest rate first. It costs the least in total interest because you shut down the most expensive accrual before anything else.
The snowball method targets the smallest balance first. It costs somewhat more in interest but produces a finished debt sooner, which is the part that keeps people going.
Both methods pay minimums on everything else and throw every spare dollar at the single target debt. The disagreement is only about which debt goes first.
Model a real three-debt situation
Say you have a $6,400 card at 22.9%, a $2,100 store card at 26%, and a $14,000 auto loan at 6.4%. Your minimums total about $620 and you can find $850.
Avalanche says the store card goes first because 26% is the highest rate. Run $2,100 at 26% with the $230 of spare cash plus its own minimum and see how quickly it clears.
Snowball also says the store card, because it is the smallest. When the two methods agree, stop debating and start paying — that happens more often than the internet suggests.
- Avalanche: order debts by APR, highest first.
- Snowball: order debts by balance, smallest first.
- Both keep minimums current on every other account.
- When the highest-rate debt is also the smallest, the methods agree.
- The interest difference between them is often smaller than people assume.
How to run a multi-debt plan here
Model your target debt with its real balance, its real rate, and the full amount you are sending it — minimum plus everything extra.
When it clears, open the calculator again for the next debt. This time the payment includes the freed-up money from the debt you just finished, which is why the second one goes faster than the first.
Doing it sequentially like this mirrors how the plan actually unfolds and keeps each projection honest, rather than trying to model everything at once.
A hybrid that most people end up using
In practice many households clear one small annoying balance first for the momentum, then switch to strict highest-rate order for everything remaining.
That captures most of the psychological benefit of the snowball while giving up only a small amount of interest, since the small balance clears quickly either way.
Run it both ways and look at the total interest difference. If it is forty dollars, take the momentum. If it is eight hundred, reconsider.
The order is a tool for finishing, not a test you pass. The plan you follow for two straight years beats the optimal plan you abandon in month four.
Picking between them without overthinking
Compute the interest difference before you argue about it. On a typical three-debt household the gap between avalanche and snowball is often a few hundred dollars over the full plan.
If that gap is small and the snowball gives you a win in two months instead of fourteen, the psychological return is worth more than the spread.
If one debt is at 26% and everything else is at 5%, take the avalanche. When the rate difference is dramatic, the math stops being a tiebreaker and becomes the answer.
A third path: consolidation
A personal loan at 11% that pays off three cards averaging 24% cuts the accrual roughly in half and replaces three due dates with one. That is a real improvement, not a gimmick.
It only works if you stop using the cards afterward. Consolidating $9,000 and then rebuilding $6,000 of card balances over the next two years is the most common way this goes wrong.
Check the origination fee, which typically runs 1% to 8%, and confirm the term. A lower payment spread over seven years can cost more in total than the cards would have.
Try these inputs
- Highest rate first: $2,100 balance, 26% APR, $330 monthly payment
- Main card next: $6,400 balance, 22.9% APR, $560 monthly payment
- Compare: $6,400 balance, 22.9% APR, $230 monthly payment