How the debt snowball and avalanche actually work
Both methods do the same core thing: you keep paying the minimum on every debt, then throw every extra dollar at one target debt until it's gone. When that debt is cleared, its old payment "rolls over" onto the next target. The only difference is which debt you target first.
The debt snowball method
You attack the smallest balance first, regardless of interest rate. Each paid-off debt is a fast, visible win, which keeps motivation high. The trade-off is that you may pay more total interest if your smaller debts happen to have lower rates.
The debt avalanche method
You attack the highest interest rate first. This is mathematically optimal — it minimizes the total interest you pay and usually clears all debt a little sooner. The trade-off is that your first target might be a large balance, so the first "win" can take a while.
Which should you choose?
- Choose avalanche if you're motivated by saving the most money and can stay disciplined without frequent wins.
- Choose snowball if you've struggled to stick with payoff plans before and need momentum from quick victories.
The calculator above shows you the real dollar difference for your specific debts, so you can decide with numbers instead of guessing.
Frequently asked questions
Does this calculator store my financial data?
No. Everything is calculated locally in your browser. Nothing is uploaded, saved, or sent anywhere.
What APR should I enter?
Use the purchase APR shown on your statement. For credit cards it's often 18–29%. For loans, use the stated interest rate.
What if my minimum payments don't cover the interest?
If a balance's interest is higher than its minimum payment, that debt would never be paid off on minimums alone. The calculator will flag this so you know to increase your payment.
Is the avalanche always better?
In total interest, almost always. But the difference is sometimes small, and the snowball's motivational wins can matter more than a modest dollar saving for many people.
This tool is for educational and estimation purposes only and does not constitute financial advice. Results are estimates based on the figures you enter and assume fixed rates and consistent payments. Consult a qualified financial professional before making decisions.