List up to four debts and an extra monthly payment. See your debt-free date and total interest with the snowball and avalanche methods side by side.
By TanLabs · Formulas cross-checked against the free spreadsheet · Updated 2026-10-31 · Runs in your browser – nothing you type is sent anywhere
With debt 1 balance $1,500, debt 1 APR 8%, debt 1 minimum $50, debt 2 balance $4,500, debt 2 APR 18%, debt 2 minimum $90, debt 3 balance $9,000, debt 3 APR 24%, debt 3 minimum $200, extra per month $150:
Snowball: 46 months, interest $7,442
Avalanche: 44 months, interest $6,342 · Difference $1,099
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Every month all minimums are paid; the extra money (plus minimums freed from paid-off debts) goes to the smallest balance (snowball) or the highest APR (avalanche).
Avalanche always costs the same or less interest. Snowball gives quicker wins, which helps many people stick with it.
Both methods then just pay minimums; freed-up minimums still roll over.
No – stop adding to the debts for the plan to hold.