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Debt Payoff Calculator

Result

Calculated result 22.425741878 Based on the values entered.
↗ Finance

Debt Payoff Calculator — free online calculator.

Formula

-log(1-balance*monthly_rate/payment)/log(1+monthly_rate)
  • Debt Payoff Calculator calculates its result from Balance, Monthly rate, Monthly payment. It uses the formula -log(1-balance*monthly_rate/payment)/log(1+monthly_rate). Change any input to recalculate the result instantly.
  • The main inputs are Balance, Monthly rate, Monthly payment. Enter them in the units and format shown in the calculator.
  • Use monetary amounts, rates and time periods exactly as labeled; the result reflects the assumptions entered on this page.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Debt Payoff

Inputs
  • Balance: 10000
  • Monthly rate: 0.01
  • Monthly payment: 500

Using Balance = 10000, Monthly rate = 0.01, Monthly payment = 500, the calculated result is 22.425741878.

Sample result: Calculating…

Frequently asked questions

What does the Debt Payoff calculate?

Debt Payoff Calculator — free online calculator.

Which values should I enter?

Enter Balance, Monthly rate, Monthly payment using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: -log(1-balance*monthly_rate/payment)/log(1+monthly_rate).

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026