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APR calculator

Find the monthly discount rate that equates net proceeds with equal monthly payments, then multiply that rate by 12.

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Answer

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Find the monthly discount rate that equates net proceeds with equal monthly payments, then multiply that rate by 12.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
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Formula and assumptions
An actuarial estimate for one advance, equal monthly periods and a first payment one month later. Enter only fees included in your comparison; this tool does not decide which charges a law requires. No odd first periods, balloon payments, variable rates or jurisdiction-specific disclosure rounding. Confirm a lender disclosure against its actual payment schedule.
Automatic precision shows money to two decimal places and other numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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Using APR calculator
Find the monthly discount rate that equates net proceeds with equal monthly payments, then multiply that rate by 12.
An actuarial estimate for one advance, equal monthly periods and a first payment one month later. Enter only fees included in your comparison; this tool does not decide which charges a law requires. No odd first periods, balloon payments, variable rates or jurisdiction-specific disclosure rounding. Confirm a lender disclosure against its actual payment schedule.
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A worked example
For loan principal = 10000, contract annual interest (%) = 12, equal monthly payments = 12, included upfront finance charges = 0, estimated apr (%) = 12.
Before you use the result
An actuarial estimate for one advance, equal monthly periods and a first payment one month later. Enter only fees included in your comparison; this tool does not decide which charges a law requires. No odd first periods, balloon payments, variable rates or jurisdiction-specific disclosure rounding. Confirm a lender disclosure against its actual payment schedule.
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ToolOctopus. “APR calculator.” Updated 2026-09-29. https://tooloctopus.com/apr-calculator.
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