What this estimate includes
This calculator is designed for a quick planning comparison, with every important assumption visible. It includes:
- Up to three balances, APRs, and minimum payments
- One shared extra monthly payment
- Monthly interest and payments until all entered balances reach zero
How the calculation works
Snowball targets the lowest current balance. Avalanche targets the highest APR. Paid-off minimums roll into the next target.
Results update as you type. Rounding happens for display; calculations use the full values entered. A real statement, pay stub, contract, or account agreement may use different timing and rules.
A worked example
With three balances and $250 extra each month, the avalanche usually costs less interest, while the snowball can produce an earlier first payoff.
Important limitations
This is an educational estimate, not financial, tax, legal, or employment advice. It cannot account for every local rule, fee, benefit, deduction, compounding convention, or personal circumstance. Use it to understand direction and scale, then verify an important decision with the relevant employer, lender, account provider, or qualified professional.
Frequently asked questions
Which method is better?
Avalanche is mathematically designed to minimize interest. Snowball may be easier to sustain because early balance wins can feel motivating.
Can the actual payoff differ?
Yes. Daily interest, variable rates, fees, minimum-payment formulas, and new purchases can all shift the timeline.
Reviewed August 17, 2026. We review formulas and explanations for clarity. If you spot a problem, please tell us.