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Debt Payoff Calculator

Months to pay off a balance with fixed payments.

Compute how many months it will take to pay off a balance at a given monthly payment and interest rate.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

$
%
$

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

n = −log(1 − r·B/P) / log(1 + r), where r is the monthly rate, B the balance, and P the monthly payment.

In depth

Compute how many months it will take to pay off a balance at a given monthly payment and interest rate.