Debt Snowball Calculator

Enter each debt with its balance, interest rate, and minimum payment, plus whatever extra you can put toward debt every month. The calculator runs a real month-by-month payoff simulation and shows the snowball and avalanche methods side by side.

Your debts

Debt-free date (snowball)
Months to debt-free
Total interest — snowball
Total interest — avalanche
Payoff order (snowball)Paid off in

Simulation assumes fixed APRs and that freed-up minimum payments roll into the next debt. Results are estimates.

Get the full Debt Payoff Planner

This calculator gives you the headline numbers. The SheetWell Debt Payoff Planner ($7.99) gives you the entire month-by-month schedule for up to 8 debts, snowball/avalanche toggle, payoff dates per debt, and total-interest tracking — in your own spreadsheet, forever.

See the Debt Payoff Planner →

How the debt snowball method works

With the debt snowball, you keep paying the minimum on every debt and throw every spare dollar at the smallest balance first. When that debt dies, its minimum payment rolls into the attack on the next-smallest balance — so your payoff power "snowballs" month after month. The method was popularized because it front-loads wins: most people stay motivated when a whole account disappears within a few months.

Snowball vs avalanche: which saves more?

The debt avalanche targets the highest interest rate first instead. Mathematically the avalanche always costs the same or less in total interest — that's why this calculator shows both. In practice the difference is often smaller than people expect (run your real numbers above and check), and behavioral studies repeatedly find that people who see early wins are more likely to finish. The honest answer: the best method is the one you'll stick with for the whole ride.

Three levers that matter more than the method

  1. The extra payment. Going from $0 to even $100/month of extra payment usually cuts years off the schedule. The method choice changes interest by a few percent; the extra payment changes it by multiples.
  2. Not adding new debt. A payoff plan only works when balances stop growing. Freeze the cards you're paying off.
  3. Automating it. Decide once, automate the payments, and let the system run — willpower is a terrible monthly strategy.

Want the full month-by-month schedule with paid-off dates per debt, and the ability to re-plan when life happens? That's exactly what our Debt Payoff Planner spreadsheet does — same engine as this calculator, but it lives in your own Excel or Google Sheets file with up to 8 debts over 120 months.

Frequently asked questions

Should I use the snowball or avalanche method?
Avalanche (highest APR first) always wins or ties on total interest. Snowball (smallest balance first) wins on motivation, because you close whole accounts sooner. If the interest difference shown above is small, choose snowball; if it's hundreds of dollars, consider avalanche.
What counts as the minimum payment?
The minimum your lender requires each month — it's on every statement. Credit-card minimums are typically 1–3% of the balance; loans have a fixed installment. The calculator assumes the minimum stays constant, which is slightly conservative for credit cards.
Should I save or pay off debt first?
A common rule: build a small starter emergency fund (around $1,000) first so surprises don't go on the card, then attack debt, then build full savings. Our free emergency fund calculator can size that for you.
Why does my card's payoff take so long with minimums only?
Because minimum payments are designed to barely outrun interest. On a typical 22% APR card, minimum-only payoff can take well over a decade. Any fixed extra payment breaks that pattern immediately.

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