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Safety Stock and Reorder Point Calculator
Estimate buffer stock from demand/lead-time variability and an entered normal quantile.
Average daily demand, Daily demand standard deviation, Mean lead time (days), Lead-time standard deviation (days), Entered standard-normal quantile z
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
Average daily demand: 100
Daily demand standard deviation: 20
Mean lead time (days): 7
Lead-time standard deviation (days): 1
Entered standard-normal quantile z: 1.6448536269514722
Limitations
- Nonnegative average daily demand,daily demand SD,mean lead days,lead-time SD,and z0–5. Independent demand and lead-time normal approximation:variance=L*sdDemand²+meanDemand²*sdLead². User supplies z,not a promised service level. Ceiling counts<=1e9. No demand forecast,seasonality,correlation,shortage optimization or guarantee.
- 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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