Formula & method
Monthly interest = balance × APR ÷ 12
Snowball targets the smallest balance; avalanche targets the highest APR. Both roll freed payments into the next debt.
Assumptions
- Inputs remain in your browser and are not saved.
- Rates are converted to the payment frequency shown.
- Results are rounded for display; internal calculations retain precision.
Example calculation
Example
Avalanche usually minimises interest; snowball may deliver earlier motivational wins.
Important
Educational estimates only — not financial, tax or legal advice.