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What this calculator does
Enter your debts, interest rates, and minimum payments. The calculator runs both the Snowball and Avalanche methods so you can compare total months and interest.
The math
Snowball pays the smallest balance first. Avalanche pays the highest APR first. Both pay minimums on all other debts and apply the extra cash to the target debt.
Worked example
With $3,000 at 18%, $1,200 at 24%, and $100/month extra, Avalanche usually wins on interest saved, while Snowball may win on motivation.
Why this matters
Most people underestimate the cost of small interest and fee decisions. This calculator turns the hidden math into a number you can act on today.
Methodology and transparency
This page publishes the exact formula used to compute the result, so you can verify it in a spreadsheet or check the assumptions against your own situation. The worked example uses the tool default inputs; change any number and the result updates live in your browser. No data is sent or stored.
Common questions
Which is better, Snowball or Avalanche?
Avalanche almost always saves the most interest. Snowball can be better for motivation if you need quick wins.
Do minimum payments stay the same?
The calculator assumes minimum payments stay flat. In reality, minimum payments drop as balances fall, so paying the original minimum accelerates payoff.
Can I add more than three debts?
Yes. Click the Add Debt button to add as many debts as you need.