Snowball vs avalanche debt payoff calculator
Add your debts, set your monthly budget, and see exactly how long each strategy takes, and how much interest you'll pay with each.
Your debts
Add every debt you're paying down. Use the minimum payment from your statement.
Smallest balance first
2 yr 4 mo
Total interest: $2,545
Debt-free: Aug 2028
Highest APR first
2 yr 4 mo
Total interest: $2,545
Debt-free: Aug 2028
Avalanche saves you $0 in interest and finishes — sooner than snowball.
Snowball usually wins on motivation. Knocking out the smallest balance first creates momentum. If you tend to lose discipline without quick wins, snowball can be the better strategy even though it costs more. Pick the one you will actually stick with.
How the simulation works
Each simulated month, the calculator does four things in order: accrues monthly interest on every active debt at APR ÷ 12, applies the minimum payment on each, directs every dollar of your remaining budget to the strategy's target debt (smallest balance for snowball, highest APR for avalanche), and then checks whether any debt has hit zero. When a debt is cleared, its payment rolls into the next target.
The output is the total months to debt-free, total interest paid, and the side-by-side comparison.
Snowball vs avalanche, choosing for the long haul
On pure math, avalanche always wins. By targeting the highest APR first, you pay less interest overall and finish faster. Snowball wins on behavior. Closing out a small debt in two or three months produces a real, measurable victory, and people who get those wins are more likely to stick with the plan.
Run both above. If the difference between them is small (a few hundred dollars over the life of the plan), pick the one that motivates you. If the difference is large (a few thousand dollars), avalanche is probably worth the discipline.
Frequently asked questions
What's the difference between the snowball and avalanche methods?+
Snowball pays off the debt with the smallest balance first while making minimum payments on the rest. As each debt is cleared, its payment 'rolls' onto the next smallest. Avalanche pays off the debt with the highest interest rate first, regardless of balance. Snowball wins on motivation; avalanche always wins on math.
Which method should I use?+
If you tend to lose motivation without quick wins, pick snowball. The small early victories build momentum. If you can stay disciplined without those wins, avalanche saves you the most money. The best method is the one you will actually finish.
How accurate is the calculator?+
It runs a month-by-month simulation. Each month it accrues interest at your APR ÷ 12, applies your minimum payments, then directs all remaining budget to the target debt for the chosen strategy. Real-world results can vary slightly due to billing cycles, fees, or rate changes, but the comparison between methods is accurate.
What if my budget is below my total minimum payments?+
Neither strategy can finish payoff in that case. The tool will warn you and show the shortfall. Your options are to (a) raise the monthly amount, (b) negotiate hardship terms with one or more creditors, (c) consider debt management or settlement, see the Settlement Calculator on this site.
Should I include collection accounts in this tool?+
Generally no. Collection accounts work very differently from active credit accounts. Collectors often hold debts that are time-barred, mis-allocated, or unverifiable. Use the Statute of Limitations Checker and the Validation Letter Generator on this site before adding a collection account to any payoff plan.
The 5-phrase debt collector call script
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The Debt Defense Kit
If any of these debts are with third-party collectors (not the original creditor), validation should come before payoff. The Defense Kit handles that. 10 documents in total: federal and California-specific validation letters, the inadequate-response follow-up, the credit bureau dispute pack, the cease & desist, the zombie debt re-validation, the phone call script, the how-to guide with the 90-day playbook, and the complaint cheat sheet.
Important disclaimer
The Debt Defense Kit and its free tools provide educational templates and information about consumer rights under the Fair Debt Collection Practices Act (15 U.S.C. §1692 et seq.) and related state consumer protection laws. They are not legal advice, and no attorney-client relationship is created. Individual circumstances vary. Consult a licensed attorney in your jurisdiction for advice on your specific matter. Testimonials reflect individual experiences and do not guarantee similar results.