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Cash Flow Payback Calculator
Find simple and discounted payback from a complete periodic cash-flow stream.
Initial investment outlay, End-period net cash flows, Discount rate per period (%)
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the labelled values using the displayed units and explicit assumptions.
- Choose Calculate result and review the complete report and any undefined or no-solution states.
- Choose Download result to save the complete JSON. Reset clears the result and restores example controls.
Examples
Initial investment outlay: 10000
End-period net cash flows: [3000,4000,5000,2000]
Discount rate per period (%): 8
Limitations
- Positive initial outlay,1–1000 signed end-period cash flows,constant discount rate>-100% to100%. First cumulative recovery crossing is reported using within-period linear interpolation;later reversals remain visible in full schedule. Null if never recovered;zero-crossing is not a recommendation or IRR. Cash flows are a JSON numeric array;supported rate lower bound is-99.999999999.
- Scalar controls accept explicit finite decimal syntax;positive values normally1e-12–1e12,nonnegative0–1e12 unless a narrower range is stated. JSON numeric rows use finite IEEE754 values within their stated bounds. Derived counts above1billion and nonfinite results refuse. Combined input<=400000UTF8 bytes;complete JSON<=4MiB. All processing stays in your browser.
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