Debt snowball vs avalanche calculator guide
Debt avalanche directs extra money to the highest APR, while debt snowball targets the smallest balance. Both pay every required minimum and roll eliminated payments forward.
A fair comparison must use the same starting payment budget. This calculator holds that budget constant so the difference comes from priority order rather than spending more.
How to compare debt payoff strategies
- Enter every debt: Add its balance, APR, and required minimum.
- Choose sustainable extra money: Use an amount you can repeat monthly.
- Compare total interest: Review the modeled cost difference.
- Compare payoff order: Consider whether earlier account closures would improve follow-through.
Formula and variables
After minimums are paid, avalanche targets the highest rate and snowball targets the smallest balance.
Monthly debt budget = starting minimum payments + extra payment- APR — Annual percentage rate
- Determines avalanche priority and monthly interest.
- Balance — Amount owed
- Determines snowball priority.
Worked example: equal budget, different order
A borrower has one small low-rate card and one larger high-rate card.
- Extra payment
- $300 monthly
- Avalanche sends extra to the high-rate card.
- Snowball closes the small balance first.
- Both roll freed payments forward.
Result: Avalanche generally produces less interest
Snowball may still appeal when early account closures improve adherence.
Understanding your results
Interest difference
The modeled premium paid for choosing the higher-cost ordering under identical assumptions.
Payoff duration
Strategy can change timing, although the shared budget is usually the strongest driver.
Assumptions
- Rates and required payments remain stable.
- No new charges are added.
- The full starting budget continues after each payoff.
Limitations
- Issuer minimum formulas may change.
- Promotional rates and fees are excluded.
- The model cannot measure motivation or financial stress.
Common mistakes
- Comparing plans with different budgets.
- Stopping rollover after a payoff.
- Ignoring required minimums.
- Continuing to charge paid-down cards.
Practical use cases
Choose a payoff method
Quantify the financial tradeoff before choosing the order you can maintain.
Test extra payments
See how a repeatable monthly increase changes both plans.
Planning and decision guide
Cost efficiency versus behavioral momentum
Avalanche is designed to reduce interest; snowball is designed to produce earlier balance wins. The best practical plan is one you will consistently fund.
Keep a cash buffer
Do not direct every available dollar to debt if it leaves routine emergencies dependent on new credit.
Recalculate after material changes
Update balances, APRs, and minimums after a refinance, promotional-rate expiration, or major payment.
Frequently asked questions
Which saves more interest, snowball or avalanche?
Avalanche generally saves more when rates differ and all other assumptions match.
Which pays off debt faster?
The result depends on balances and minimums; the calculator shows both timelines using one budget.
Can I switch strategies?
Yes. Recalculate from current balances before changing the target order.
Should I close a card after payoff?
That decision can affect utilization, fees, and spending behavior; it is separate from payoff math.
Sources and review
- Debt action plan tool — Consumer Financial Protection Bureau. Accessed 2026-07-10.
Reviewed 2026-07-10.