What this calculator does
Calculate the periodic rate from a nominal annual rate or from an effective annual rate.
How it works
The calculator evaluates nominal: i = j/m; effective: i = (1+EAR)^(1/m) − 1. Inputs are checked before calculation, and invalid values such as zero denominators or out-of-range selections produce a clear error instead of a misleading result.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
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?annualRateType=Annual rate typeChoice · Required · Default: nominal · Accepted values: nominal, effective
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?annualRate=Annual interest ratePercentage · Required · Default: 6
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?periodsPerYear=Periods per yearNumber · Required · Default: 12
Outputs
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periodicRatePeriodic interest ratePercentage · Primary output
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nominalAnnualRateEquivalent nominal annual ratePercentage
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effectiveAnnualRateEquivalent effective annual ratePercentage
Inputs and results
The inputs are Annual rate type, Annual interest rate, Periods per year. Results include Periodic interest rate, Equivalent nominal annual rate, Equivalent effective annual rate.