Debt Snowball vs Avalanche Calculator
Enter your debts and instantly see which payoff method wins: the avalanche (least interest) or the snowball (fastest first win). You get exact payoff months, total interest, and the payment order for each — no sign-up.
Quick answer
With $27,000 across three debts and $300 extra a month, avalanche costs $3,647 in interest and snowball costs $3,753 — a difference of just $107. The extra $300 itself is worth $5,882, which is the number that actually decides this. Change the inputs above and this answer updates with your own numbers.
Total debt falling to zero
Green = avalanche, blue = snowball. The lower/steeper line clears debt sooner.
Your payoff order & debts
Which debt each method attacks first, then your debts as entered.
| Method / Debt | Balance | APR | Min |
|---|
What the two methods actually change
Both methods do the same thing: pay every minimum, then throw every spare dollar at one debt until it is gone, then roll that freed-up payment onto the next. They differ on one question only — which debt goes first.
- Avalanche targets the highest interest rate first. This is mathematically optimal: it always produces the lowest total interest.
- Snowball targets the smallest balance first. It costs slightly more, and it clears individual debts sooner, which is the point — the list gets shorter faster.
Everything else about the two is identical. The calculator above runs both on your actual debts and shows the gap.
The argument is worth $107. The extra payment is worth $5,882.
The snowball-versus-avalanche debate takes up an enormous amount of the internet's attention. On a realistic set of debts — a $6,000 card at 24.99%, a $12,000 car loan at 7.5% and a $9,000 student loan at 5.5%, $27,000 in total — here is what it is actually worth:
| Extra per month | Snowball interest | Avalanche interest | Avalanche saves |
|---|---|---|---|
| $0 | $9,635 | $9,635 | $0 |
| $100 | $5,854 | $5,824 | $31 |
| $200 | $4,512 | $4,427 | $85 |
| $300 | $3,753 | $3,647 | $107 |
| $500 | $2,865 | $2,750 | $114 |
Read the columns rather than the last one. Choosing avalanche over snowball saves $107. Finding $300 a month saves $5,882 — the drop from $9,635 down to $3,753.
The method is worth roughly two per cent of what the extra payment is worth. So if snowball's early wins are what keep you paying $300 a month instead of $100, snowball is not the inferior choice — it is comfortably the better one, because it protects the variable that actually matters.
Note the first row too. With no extra payment the two methods are identical, because there is nothing to redirect. Without extra money, ordering is not a strategy.
How the simulation works — no black box
The calculator runs your debts forward month by month rather than using a shortcut formula:
- Charge one month of interest to every debt at its own rate.
- Pay every minimum.
- Direct all remaining money — your extra, plus every minimum freed by a debt that has been cleared — at the current target debt.
- When a debt hits zero, move to the next in the chosen order and repeat.
The "snowball" name comes from step 3: each cleared debt permanently enlarges the payment attacking the next one, so the process speeds up as it goes. The last debt is always cleared fastest, however large it is.
The things that matter more than the order
- The size of the extra payment. Worth roughly fifty times the method choice in the example above.
- The interest rate itself. Moving a 24.99% card to a lower-rate personal loan or a 0% balance transfer changes the arithmetic more than any ordering can.
- Not adding new debt. A cleared card that fills up again resets everything, and it is the most common reason a payoff plan fails.
- Actually finishing. A plan you abandon at month eight beats no plan, but loses to a slightly worse plan you complete.
Which should you choose?
Pick avalanche if the numbers themselves motivate you and your highest-rate debt is not so large that clearing it takes a discouragingly long time. Pick snowball if you have several small debts and the momentum of closing accounts is what will keep you going. If your highest-rate debt also happens to be your smallest — very common, since credit cards are usually both — the two methods agree and there is nothing to decide.
The full comparison, with the behavioural research, is in debt snowball vs avalanche.
Frequently asked questions
Which is better, debt snowball or avalanche?
Avalanche is always cheaper, but usually by far less than people expect. On $27,000 across three debts with $300 a month extra, avalanche saves $107 in total interest versus snowball. The same $300 extra payment is worth $5,882. If snowball's early wins are what keep you paying the extra, it is the better choice despite costing slightly more.
How much does the extra payment matter?
Far more than the method. On the example debts, going from $0 to $300 extra a month cuts total interest from $9,635 to $3,753 — a saving of $5,882, roughly fifty times what choosing avalanche over snowball is worth.
What if I cannot pay anything extra?
Then the two methods produce exactly the same result, because there is nothing to redirect. With only minimums being paid, ordering is not a strategy. The lever available to you is the interest rate — a balance transfer, a consolidation loan, or asking your issuer for a reduction.
Should I include my mortgage?
Usually not. Mortgage rates are typically far below card and personal loan rates, so a mortgage sits at the bottom of any sensible payoff order and simply clutters the picture. Most people run this on unsecured debt — cards, personal loans, car finance, student loans.
What happens when a debt is paid off?
Its minimum payment is added to the amount attacking the next debt, on top of your extra. This is the snowball effect: each cleared debt permanently enlarges the payment hitting the next one, so the process accelerates and the final debt clears fastest regardless of its size.
Does paying off debt help my credit score?
Reducing balances generally helps, particularly on revolving credit where the ratio of balance to limit is a significant factor. Closing accounts is a separate decision and can work against you by reducing available credit — paying a card to zero and leaving it open is usually treated more kindly than paying it off and closing it.
Method & sources
- Calculation: Month-by-month simulation of both strategies — interest accrual, minimum payments, and a rolling extra payment funneled to the priority debt until all balances reach zero.
- Method definitions follow standard debt-snowball and debt-avalanche practice as described in Consumer Financial Protection Bureau (CFPB) debt-repayment guidance.
- Reviewed: · Assumptions reviewed quarterly.
Educational estimate, not financial advice. Confirm minimums and APRs with your lenders.
Run your own numbers
Add your debts, set what you can pay above the minimums, and see both payoff orders side by side — including how much the extra payment is really worth.
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