What Is the Debt Snowball vs Avalanche Calculator?
The debt snowball vs avalanche calculator compares the two most popular payoff strategies. Avalanche attacks the highest-interest debt first to minimize total interest; snowball clears the smallest balances first to build psychological momentum.
How to use this calculator
Type your numbers into the fields above. The results change the moment you edit any input, so you can try one scenario after another and see exactly what moves. Most calculators show a short summary of the key figures, a line-by-line breakdown underneath, and — where it applies — a year-by-year schedule you can export to a spreadsheet. Everything runs in your browser; nothing is stored or sent anywhere. Treat the output as a planning estimate, not as final word on a real decision.
The Formula
Both strategies pay each debt's minimum, then throw any extra money at a priority debt. Avalanche prioritizes the highest APR; snowball prioritizes the lowest balance. The calculator simulates the month-by-month payoff for each and reports total time and interest.
Worked Example
With $25,000 of debt at an 18% average rate and $400 extra a month, avalanche finishes with the least interest, while snowball may take slightly longer but gives early wins as small balances disappear.
Tips for the Most Accurate Estimate
- Choose avalanche to save the most money mathematically.
- Choose snowball if you need quick wins to stay motivated.
- Either beats paying only minimums.
- Keep the extra payment fixed even as balances fall.
- Stop new charges while paying down debt.
Frequently Asked Questions
Q: Which saves more money?
Avalanche almost always saves more interest because it retires high-rate debt first.
Q: Why would anyone use snowball?
Because paying off small balances quickly creates momentum and motivation, which helps many people stick with the plan.
Q: Does the extra payment stay the same?
Yes. As each debt is cleared, its minimum is added to the extra, accelerating later payoffs — the 'snowball' effect.