How to use this calculator
- Enter balances, comma-separated, matching nominal annual rates (%), matching fixed monthly minimums, extra monthly repayment budget.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Up to 20 debts; minimums and rates remain fixed, no new borrowing or fees. A budget that cannot reduce overall debt or a schedule beyond 1,200 months is rejected.
Worked example
Balances 1,000 and 2,000, both at 0%, with minimums 50 each and 100 extra give a total budget of 200. Both strategies clear 3,000 in 15 months.
What the result means
Compare two repayment orders using the same fixed monthly budget and entered debts.
Common questions
How is the calculation performed?
Pay accrued monthly interest and required minimums, then direct remaining fixed total budget to highest-rate debt (avalanche) or smallest remaining balance (snowball). Freed minimums roll into the budget.
What does the model leave out?
Up to 20 debts; minimums and rates remain fixed, no new borrowing or fees. A budget that cannot reduce overall debt or a schedule beyond 1,200 months is rejected.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.