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Safety Stock Calculator
ASCM-style statistical safety stock with demand variability, lead-time variability, service level and reorder point.
Inputs
Method selected automatically
Combined independent demand + lead-time variability.
Inventory policy result
STATISTICALSafety stock—units
Reorder point—units
Demand during lead time—units
Z factor—service factor
Safety coverage—days at average demand
Formula used
Methodology
ASCM defines safety stock as protection against demand/forecast and supply variability. For independent demand and lead-time variability, this calculator uses the combined standard deviation of lead-time demand, then multiplies by the Z factor for the selected service level. Reorder point = average lead-time demand + safety stock.
ASCM / APICS methodologyOracle NetSuite inventory optimization formulaNormal-demand assumption
For intermittent, strongly seasonal, promotional or biased demand, a normal-distribution safety-stock model can be misleading. Use forecast-error or specialized intermittent-demand methods instead.
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