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Debt Snowball vs Avalanche Payoff Planner

Math

Simulate paying off a list of debts under both the snowball strategy (smallest balance first) and the avalanche strategy (highest interest rate first), given a fixed extra monthly payment, and compare months to payoff and total interest

Enter each debt's balance, interest rate, and minimum payment, plus how much extra you can put toward debt every month, and see how long payoff actually takes under the two most common strategies. Snowball targets the smallest balance first for early wins and momentum. Avalanche targets the highest interest rate first to minimize total interest paid. Both strategies keep your total monthly budget fixed: once a debt is paid off, its minimum payment rolls into the extra amount going toward the next targeted debt instead of disappearing. The tool runs both simulations side by side so you can see exactly how many months and how much interest each approach costs you.

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How to use Debt Snowball vs Avalanche Payoff Planner

  • 1.Add each debt with its current balance, annual interest rate, and minimum monthly payment.
  • 2.Enter how much extra you can pay toward debt every month on top of the minimums.
  • 3.Compare the snowball and avalanche results: payoff order, months to debt-free, and total interest paid for each.

Frequently asked questions

Which strategy actually saves more money?
Avalanche always pays the same or less total interest than snowball for the same monthly budget, since it prioritizes the highest interest rate first. Snowball can still be the better choice for some people because paying off a small balance quickly builds momentum and motivation.
What happens to a paid-off debt's minimum payment?
It gets redirected: once a debt reaches zero, its minimum payment plus your extra amount both cascade onto the next debt in priority order, so your total monthly budget never actually decreases until everything is paid off.
Why did I get an error instead of a result?
If a debt's minimum payment doesn't even cover the interest accruing on it and there isn't enough extra payment to make up the difference, the balance grows forever instead of shrinking. The simulation caps out at 100 years and reports an error rather than looping indefinitely.
Does this account for changing interest rates or promotional periods?
No, it assumes every debt's interest rate stays fixed for the entire simulation. A 0% promotional period that later jumps to a much higher rate, for example, isn't modeled and would need to be run as a separate scenario.

Use via API, SDK, or MCP

cURL# Free: 1,000 req/day · Pro: 10,000 req/day
curl -X POST https://api.utilix.tech/v1/tools/debt-payoff-planner \
  -H "Authorization: Bearer utx_live_..." \
  -H "Content-Type: application/json" \
  -d '{"debts":[{"label":"Credit card","balance":4000,"ratePercent":22,"minPayment":100},{"label":"Car loan","balance":12000,"ratePercent":6,"minPayment":250}],"extraMonthlyPayment":200}'

Get an API key from your dashboard · Full API docs →

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