Debt Payoff Calculator
Compare the snowball and avalanche strategies across up to 3 debts — see which clears faster and which saves more interest.
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Debt-Free In (Avalanche)
3 yr 1 mo
Avalanche and snowball cost about the same here
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Last updated: August 5, 2026 · Reviewed by the DoCalc team
What Is a Debt Payoff Calculator?
When you're juggling more than one debt, the order you attack them in changes both how fast you're debt-free and how much interest you pay in total. This calculator simulates two well-known strategies — avalanche and snowball — across up to three debts at once, so you can see the real numbers behind each before committing to one.
How the Two Strategies Work
Avalanche: pay the minimum on every debt, then direct all extra budget to the debt with the highest interest rate. Once it's paid off, its minimum payment rolls into the extra budget for the next-highest-rate debt, and so on. This minimizes total interest paid — it's the mathematically optimal order.
Snowball: pay the minimum on every debt, then direct all extra budget to the debt with the smallest balance, regardless of rate. Each payoff is a quick, visible win, which many people find easier to stick with — even though it usually costs a bit more in total interest than avalanche.
Worked Example
Two debts — $6,000 at 24.99% APR ($150 min) and $12,000 at 9.5% APR ($250 min) — with $200/month extra:
When the highest-rate debt and the smallest-balance debt are the same account, snowball and avalanche produce identical results — there's no order to disagree on. The strategies only diverge when those two debts are different accounts. For example, swap the $12,000 balance above for a smaller $2,000 balance at the same 9.5% rate, and the order splits: avalanche tackles the $6,000/24.99% card first (highest rate), while snowball tackles the $2,000 card first (smallest balance) — avalanche finishes in the same time but saves roughly $61 in interest in that scenario. Try adjusting the balances and rates above to see your own numbers diverge.
Snowball vs. Avalanche at a Glance
| Strategy | Priority order | Optimizes for |
|---|---|---|
| Avalanche | Highest interest rate first | Minimum total interest paid |
| Snowball | Smallest balance first | Fastest individual account payoffs, motivation |
Pros and Cons
Avalanche pros: saves the most money mathematically, especially when rate differences are large. Avalanche cons: if the highest-rate debt also has a large balance, it can take a while before you see your first account fully paid off — which can be discouraging.
Snowball pros: quick wins build momentum and make the plan easier to stick with. Snowball cons: typically costs somewhat more in total interest than avalanche, especially when the smallest-balance debt isn't also a high-rate one.
Who Should Use This Calculator
Use it if you're carrying 2-3 debts and want to see the concrete time and interest difference between the two most common payoff strategies before committing to one.
If you only have one debt, the strategy question doesn't apply — use the Loan Payoff Calculator or Credit Card Payoff Calculator instead.
Common Mistakes to Avoid
The most common mistake is switching strategies partway through, which resets the momentum both approaches are built on. A second mistake is not accounting for a paid-off debt's minimum payment rolling into the next target — that rollover is what makes both strategies accelerate over time, not a flat extra payment alone. A third is ignoring the psychological factor entirely — the "optimal" avalanche strategy only wins if you actually stick with it, and for many people, snowball's faster wins matter more in practice than the math suggests.
Expert Recommendation
If the interest-rate gap between your debts is large, avalanche's savings are usually worth prioritizing. If your debts have similar rates, or you know from experience that quick wins keep you motivated, snowball's psychological edge may be worth the modest extra interest cost. Either way, the biggest lever is the extra monthly amount — increasing it accelerates both strategies more than switching between them does.
Frequently Asked Questions
What's the difference between snowball and avalanche?
Avalanche puts extra payments toward the highest-interest-rate debt first, which minimizes total interest paid mathematically. Snowball puts extra payments toward the smallest-balance debt first, which clears individual accounts faster — often producing a psychological momentum boost, even though it usually costs somewhat more in total interest than avalanche.
Which strategy should I actually use?
Avalanche saves the most money mathematically and is the better choice if you're confident you'll stick with the plan regardless. Snowball can be the better real-world choice if quick wins keep you motivated — the "best" strategy is the one you'll actually follow through on, not necessarily the one that wins on a spreadsheet.
What happens to a paid-off debt's minimum payment?
It rolls into the pool of money going toward your next-priority debt — that's the core mechanic of both strategies. Your total monthly debt payment stays the same throughout, but where it's directed shifts as each debt is cleared.
Does this work for more than 3 debts?
This calculator supports up to 3 debts for a clear, fast comparison. If you have more, the same logic extends directly — highest rate first for avalanche, smallest balance first for snowball — you'd just need to track additional accounts alongside this calculator's math.
Should I stop contributing to savings while paying off debt?
Most financial guidance suggests keeping a small emergency fund even while aggressively paying down debt, so an unexpected expense doesn't become new debt on a card you're actively trying to pay off — then directing the rest of your extra cash toward the payoff plan.
How is the interest saved calculated?
The calculator simulates both strategies month by month — accruing interest on each debt, applying minimum payments, then directing any extra budget to the priority debt under each strategy — and compares the total interest paid across all debts under each approach.
Conclusion
Avalanche wins on paper; snowball often wins in practice. Run your real balances and rates above to see exactly how much avalanche would save you — then decide honestly which plan you're more likely to finish.