Mixed debt example
Credit card $4,200 at 24.9%, card $1,200 at 21.9%, student loan $9,800 at 5.5%, auto loan $7,200 at 7.9%
With $490 of minimums plus $150 extra, avalanche saves an estimated $49.10 in this reproducible example.
Strategy guide
Debt Snowball vs Avalanche Calculator
Published by Sonya · DebtPayoff.cc · Published: 2026-07-08 · Updated: 2026-07-31
Reviewed for calculation accuracy against the published method and automated tests
- Page purpose
- Choose a payoff priority after comparing behavioral and interest-cost tradeoffs
- 独立内容 / Unique value
- Controlled side-by-side scenarios with the same debts, budget, payoff months, and interest assumptions
- Source scope
- Consumer debt planning sources; US examples are labeled as US examples. English examples use US consumer-credit sources where stated; local lender terms always control.
- Limits
- Does not model daily interest, fees, promotional APR changes, hardship plans, or lender payment allocation rules
Snowball and avalanche use the same minimum payments and the same extra monthly budget, but they answer different planning questions: which method gives faster visible wins, and which method is usually cheaper by interest cost.
What each strategy optimizes
Debt snowball pays the smallest balance first after minimum payments. The point is behavioral: a smaller first target can disappear sooner, which may make the plan easier to continue.
Debt avalanche pays the highest APR first after minimum payments. The point is cost control: high-rate balances usually add interest faster, so attacking them first can reduce total interest.
Example: mixed balances and rates
This reproducible scenario uses a $4,200 card at 24.9% with a $125 minimum, a $1,200 card at 21.9% with a $45 minimum, a $9,800 student loan at 5.5% with a $110 minimum, and a $7,200 auto loan at 7.9% with a $210 minimum. The shared extra budget is $150 per month.
Avalanche starts with the 24.9% card, while snowball starts with the $1,200 card. Both estimates finish in 41 months; the current engine estimates $3,535.44 of snowball interest and $3,486.34 of avalanche interest, a $49.10 difference under these assumptions.
| Strategy | First target | Estimated months | Estimated interest |
|---|---|---|---|
| Snowball | $1,200 card at 21.9% | 41 | $3,535.44 |
| Avalanche | $4,200 card at 24.9% | 41 | $3,486.34 |
Example: credit-card-heavy debt
In the credit-card-heavy example, Card A is $3,500 at 22.9%, Card B is $1,800 at 19.9%, and the personal loan is $6,500 at 12.5%.
Because the high-rate balances dominate the scenario, avalanche has more room to reduce interest. Snowball can still be useful if the $1,800 card payoff is the progress signal that keeps the monthly budget intact.
How to choose responsibly
Use the comparison as a planning lens, not a command. If the interest difference is small, the strategy you can follow consistently may matter more than the mathematically cheapest route.
If the interest difference is large, especially with high APR credit cards, review whether motivation tactics can be added while still prioritizing the highest APR debt.
- Educational only. Not financial advice.
- 100% browser-local calculation
- No account, no upload, no server storage
How it works
List all debts
Enter each balance, minimum monthly payment, and APR.
Add extra monthly budget
Choose how much extra you can reliably pay after minimums.
Choose a strategy
Compare snowball, avalanche, or a custom priority order.
Review the payoff plan
Check payoff month, total interest, charts, and the monthly schedule.
Export or share
Download CSV or PDF, or share a link with the exact scenario.
Real-world examples
Credit-card-heavy example
Card A $3,500 at 22.9%, card B $1,800 at 19.9%, personal loan $6,500 at 12.5%
Avalanche gains more value when high-rate balances dominate.
Common snowball mistakes
- Ignoring very high APR debt for too long.
- Choosing an extra payment that is not sustainable.
- Forgetting to roll freed minimum payments into the next target debt.
Methodology and limitations
The model applies minimum payments first, then routes the extra budget by strategy priority. It uses a monthly compounding approximation and rounds displayed values for readability.
Real-world results can differ because daily interest, fees, promotional APRs, hardship programs, and prepayment rules can change how quickly a balance falls.
- It uses a monthly compounding approximation from each APR, so the schedule is easier to compare month by month.
- It covers every minimum payment first before assigning any extra budget to a target debt.
- It sends the extra budget to the selected priority: smallest balance for snowball, highest APR for avalanche, or your custom order.
- It rounds displayed dollars and payoff months for readability, while lender statements may show cents, cutoff dates, and payment posting details differently.
- It assumes lender terms stay the same, even though real accounts can change rates, fees, payment allocation rules, and required minimums.
Primary sources
- Debt action plan tool — Consumer Financial Protection Bureau
- How to reduce your debt — Consumer Financial Protection Bureau