ReckonBoxTwo ways to clear the same debts
The debt snowball is the strategy that clears your smallest balance first, while the debt avalanche clears your highest interest rate first. Both make the minimum payment on every other debt and throw every spare dollar at one target, so the only real difference is which debt the money points at.
That single choice splits into two numbers, and this tool shows both. Take the sample: three cards, $1,000 at 12%, $3,000 at 19%, and $5,000 at 25%, with $300 extra a month on top of the $185 in minimums. Avalanche costs $1,879 in interest and snowball costs $2,287, so avalanche saves $408 and finishes a month sooner. Snowball, though, zeroes out that first $1,000 card in month 4, while avalanche clears nothing until month 15.
| Sample: $9,000 of debt, $485 a month | Snowball | Avalanche |
|---|---|---|
| Total interest | $2,287 | $1,879 |
| Debt-free in | 2 years | 1 year 11 months |
| First account cleared | month 4 | month 15 |
Which method saves more
The avalanche is the cheaper method, because it always clears your most expensive debt first. The Consumer Financial Protection Bureau describes it as targeting the highest rate to save money over the long run, and the math has no exceptions: aim your extra dollars at 25% before 12% and less interest accrues.
How much less depends almost entirely on the spread between your rates, and that saving swings more than most comparisons admit. Hold the debts and the budget fixed, $9,000 across three cards at $485 a month, and change only the rates. When they sit close together, the order barely moves the total. Stretch them wide and avalanche pulls away.
| Same $9,000, $485 a month | The rates | Avalanche saves | Debt-free gap |
|---|---|---|---|
| Rates close together | 24%, 25%, 26% | $76 | same 24 months |
| The default sample | 12%, 19%, 25% | $408 | avalanche 1 month sooner |
| Rates far apart | 8%, 20%, 29% | $677 | avalanche 2 months sooner |
Same debt, same payment, and the reward for choosing avalanche runs from $76 to $677 on nothing but the rate spread. That's the figure worth checking first. If your rates all sit within a few points, the two methods are close to a tie and you can pick on feel. If one balance carries a much higher rate than the others, avalanche earns its keep.
Why snowball still wins for some people
Snowball trades money for momentum. Clearing an entire account is a visible finish line, and on the sample it arrives in month 4 against month 15 for avalanche, so you bank 11 months of "one down" before the cheaper method clears a thing. Fidelity frames the same tradeoff: avalanche saves the most, and snowball delivers the quick psychological win that keeps people paying.
There's no universally correct answer, and pretending otherwise misleads people. If a $408 difference over two years is what keeps you from quitting in month 5, the "expensive" method is the one that actually gets you to zero. The tool puts both numbers on screen so the tradeoff stays yours to weigh in the open.
How the rollover works
Your total monthly payment stays fixed at the minimums plus your extra, $485 in the sample. Each month every debt gets its minimum, and everything left over hits the one target debt. The moment that debt clears, its old minimum isn't freed for spending; it joins the pile attacking the next target, so each debt falls faster than the one before. That compounding of freed-up payments is the "snowball" rolling downhill, and it's identical in the avalanche, just aimed by rate instead of balance.
Interest accrues each month at the APR divided by 12 on whatever balance remains. If your total payment doesn't even cover that interest, no method can help and the balance climbs, so the tool flags it and skips the imaginary payoff date.
What this does not cover
This models fixed minimum payments, the figure you enter for each debt. Real credit cards often set the minimum as a percentage of the balance that shrinks as you pay down, which stretches payoff slightly longer than a fixed minimum suggests. The tool also assumes your rates and your extra payment hold steady, and it leaves out balance-transfer fees, promotional 0% periods, late fees, and new spending on the cards.
None of this tells you which debt to attack or whether to consolidate. It shows what each method costs in interest and time so the call is yours. For a plan around your full financial picture, a nonprofit credit counselor or a qualified financial professional is the right person to ask.
Frequently asked questions
What is the debt snowball method? The debt snowball method is paying off your smallest balance first while making minimum payments on the rest, then rolling that freed-up payment onto the next smallest. It is built for motivation, since you clear a whole account quickly. On the sample debts here, snowball clears the first card in month 4, well before avalanche does.
What is the debt avalanche method? The debt avalanche method is paying off your highest interest rate first while making minimum payments on the rest, then rolling that payment onto the next highest rate. It is the cheapest route, because you kill the most expensive debt soonest. On the sample debts, avalanche pays $1,879 in interest against snowball's $2,287.
Snowball or avalanche, which saves more money? Avalanche saves more interest, always, because it targets the highest rate first. How much depends on your rate spread: on the same $9,000 with $485 a month, avalanche saves about $76 when the cards sit at 24 to 26 percent and $677 when they run 8 to 29 percent. On the default sample it saves $408 and finishes a month sooner.
If avalanche is cheaper, why would anyone pick snowball? Because snowball clears a whole account much sooner, and that visible win keeps many people going. On the sample debts, snowball zeroes out its first card in month 4 versus month 15 for avalanche, 11 months of early momentum. The right method is the one you will actually stick with, which is why this tool shows both numbers.
How does the rollover work? Your total monthly payment stays constant. Every debt gets its minimum, and all the money left over attacks one target debt. When that debt hits zero, its old minimum joins the pile hitting the next target, so the payment "snowballs" or "avalanches" and each debt falls faster than the last. That constant total is why extra payments matter so much.
How many debts can I compare and does extra payment matter? You can add as many debts as you carry, each with its balance, interest rate, and minimum payment, and the extra amount you can put in each month. The extra is what drives the payoff: with only minimums, high-rate balances can grow faster than they shrink. If the payment does not cover the interest, the tool says so instead of showing a false date.