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When you pay down several debts at once, one question decides everything: which one first? Two proven strategies give a clear answer. With the snowball method you pay the minimum on every debt and throw every extra euro at the SMALLEST balance - it clears quickly, which keeps you motivated. With the avalanche method the extra money goes to the debt with the HIGHEST interest rate - which saves the most interest overall. This calculator runs both with the same monthly budget and shows which one is faster and cheaper.
The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded and nothing is stored. For up to four debts you enter the balance, annual rate and minimum payment directly, plus the amount you can spare each month on top; "Show more debts" reveals four more rows for up to eight debts in total. The calculator simulates month by month: interest is charged, the minimums run, the rest goes to one debt by strategy. As soon as one is cleared, its payment rolls onto the next - the snowball effect. In the end you see, for both methods, the months to debt-free and the interest the avalanche saves. Change an input and everything updates instantly.
An honest note: the avalanche method is always at least as good mathematically as the snowball - it never pays more interest and never takes longer. Often the gap is small, though, and the snowball quick wins help some people stick with it. Both beat paying only the minimums by a wide margin. The calculator assumes fixed rates and a fixed monthly amount; real cards often have changing minimums and variable rates. Amounts in euros as an example - the maths applies to any currency. Not debt or financial advice.
Specifications
Specifications
Input formats
Form inputs (no file)
Processing
Locally in your browser (JavaScript)
File upload
None
In 3 steps
For each debt enter the balance, annual rate and minimum payment (leave unused rows at 0; "Show more debts" unlocks four extra rows).
Enter the amount you can pay on top each month.
Read off the interest saved, months saved and the payoff time of both methods.
Limitations:A model with fixed rates and a fixed monthly amount for up to eight debts (four visible directly, four more via "Show more debts"). Real cards often have changing minimums and variable rates. The avalanche always saves the most interest mathematically; the snowball motivates through quick wins. Amounts in euros as an example - the maths applies to any currency. Not debt or financial advice.
FAQ
Are my inputs uploaded?
No. The calculation runs entirely locally in the browser (pure JavaScript); nothing is sent or stored.
What is the difference between snowball and avalanche?
The snowball pays off the smallest balance first (quick wins); the avalanche pays the highest interest rate first (lowest total interest). Both pay the minimum on every other debt.
Which method should I pick?
Mathematically the avalanche is cheaper. If quick wins help you stick with it, the snowball can still be the better choice - the difference is often small.
Why does a higher monthly amount help so much?
Because every extra euro reduces the highest-priority debt directly instead of just covering interest. The more you add, the faster the debt falls and the less total interest you pay.
I have more than four debts - what do I do?
Turn on "Show more debts"; that reveals four additional rows for up to eight debts in total.