What's inside
- Up to 15 debts: balance, APR, minimum payment, plus the extra you can pay each month
- Two full month-by-month schedules (up to 30 years): snowball (smallest balance first) and avalanche (highest APR first)
- The rollover done properly: when a debt is paid off, its minimum moves to the next one, so your total payment stays the same until you're debt-free
- Plan tab: months to debt-free, debt-free date, total interest for each method, the savings, and a balance chart
- A warning if your budget doesn't cover the monthly interest
- Sample file: 5 debts ($25,450) with $200/month extra. Avalanche finishes a month sooner and saves $470.73
Checked, not just designed: 45,556 formulas, zero errors, and both schedules match an independent month-by-month simulation: same payoff month, same interest to the cent, same balance every month.
Works in Excel and Google Sheets. Not financial advice; lenders that compute interest daily will differ slightly.
Try the free version first
The free online calculator uses the same model for a quick answer. The spreadsheet adds tracking, history and the full views.