Snowball Debt Elimination Calculator
The debt snowball attacks your smallest balance first for quick, motivating wins, then rolls each freed-up payment onto the next. See your debt-free date.
A worked example
Running this tool on current national benchmarks (Federal Reserve / Freddie Mac via FRED (St. Louis Fed)) — swap in your own numbers to see how the result moves.
- Debt 1 — balance
- $9,000
- Debt 1 — rate
- 22%
- Debt 1 — minimum payment
- $180
- Debt 2 — balance
- $4,000
- Debt 2 — rate
- 15%
- Debt 2 — minimum payment
- $90
- Debt 3 — balance
- $6,000
- Debt 3 — rate
- 8%
- Debt 3 — minimum payment
- $110
- Extra monthly payment
- $200
46 months · $7,174 total interest
- Total debt$19,000
- Total interest$7,174
- Interest saved vs minimums$7,922
The math behind it
Every debt is charged one month of interest at its own rate, then the plan pays each minimum. Whatever is left of your budget — your extra payment plus every payment freed up as debts clear — is thrown entirely at the debt with the smallest remaining balance. When that debt hits zero, its old minimum rolls onto the next-smallest, and the pile grows. The engine repeats month by month until every balance is gone, then reports your debt-free date and total interest.
Assumptions & limits
- Debts are attacked strictly smallest-balance-first, regardless of interest rate.
- Each debt's interest rate is fixed for the whole payoff.
- You keep paying at least the minimum on every debt each month, plus the extra amount.
- No new charges are added to any balance while you pay it down.
- As each debt clears, its freed-up payment is added to the extra and rolls onto the next target.
Snowball vs. avalanche at a glance
Two orderings of the same budget. Both pay all minimums; they differ only in where the extra goes.
| Method | How it works |
|---|---|
| Snowball | Smallest balance first — fastest wins, best motivation |
| Avalanche (roll-down) | Highest rate first — least total interest, fastest math |
Common questions
Which saves more, the snowball or the avalanche?
The avalanche method — highest interest rate first — always pays the least total interest and usually clears debt slightly sooner, because it starves the most expensive balance first. The snowball pays a little more interest, but it clears whole accounts faster, and that momentum keeps many people on plan. If the two are close for your debts, the one you actually stick with wins.
Why does the smallest balance come first instead of the highest rate?
The snowball is built around behavior, not just math. Wiping out a small balance quickly gives you an early, visible win and one fewer bill to track. That psychological payoff is the whole point of the method. To optimize for interest instead, use the roll-down (avalanche) calculator.
What does the extra payment actually do here?
Your minimums keep every debt current; the extra is the engine of payoff. It goes entirely to the target debt on top of its minimum. Once a debt is gone, its minimum joins the extra, so the amount hitting your target grows every time a balance clears — that compounding roll-down is what shortens the timeline so sharply.
Why does my plan say payments are too low?
If your combined minimums and extra barely exceed the interest piling on each month, the balances hardly move and payoff would run past the model's limit. Raise a minimum or the extra payment above the total monthly interest so principal actually falls.