Debt Avalanche Calculator

Payoff-time math for one combined balance at your average APR and monthly payment. It does not route payments to highest-rate accounts first—use it as a quick single-loan estimate.

Total debt balance Average APR (%) Monthly payment budget

Result
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How this calculation works

What each input means

Total debt balance — One combined principal modeled as a single amortizing loan (the “avalanche” label describes the strategy concept, not per-account ordering in this tool).
Average APR (%) — Converted to monthly rate r = APR ÷ 100 ÷ 12.
Monthly payment budget — Constant payment applied each month.

Formula used

Uses the standard amortization payoff-time solve for one balance: months from log formula on payment, rate, and principal (same numeric model as the snowball page on this site).

Does not reorder multiple debts or allocate payments across accounts—use it as a quick single-balance payoff-time estimate.

How this result is estimated

This debt payoff strategy calculator applies the formulas described on this page to the values you enter. Outputs are not financial, tax, legal, or medical advice.

Inputs are user-provided and may include rounding.
Where accuracy, eligibility, or obligations matter, rely on official disclosures and licensed professionals.

Last reviewed: 2026-04-17

Frequently asked questions

Is this calculator result exact?

It is an estimate based on your inputs and may differ from official or provider-specific calculations.

Does this site provide financial, tax, or legal advice?

No. Each tool applies explicit formulas to values you supply. Financial, tax, and legal conclusions belong with licensed professionals and official documents.

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