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Discounted Payback Period Calculator

Fractional-year inversion of a level end-year annuity. Annual cash flow must exceed investment × discount rate. May differ from discrete-year payback tables.

Fractional-year inversion of a level end-year annuity. Annual cash flow must exceed investment × discount rate. May differ from discrete-year payback tables.

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Result

Enter your values and run the tool to see your result.

How to use this tool

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Calculation method

Discounted payback approximationrate == 0 ? investment/annual : -log(1-investment*rate/100/annual)/log(1+rate/100)

References