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fin.reorder-point-safety-stock Calculator
Calculates safety stock and reorder point from average demand, lead time, demand variability, and service level. Safety stock = z × σ_demand × √lead_time — a 95% service level requires z = 1.65 standard deviations of lead-time demand as buffer.
Inputs
D Avg Units Day
Age in completed years. Many health and fitness formulas adjust for age.
Lt Days
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Sigma D
Reference formula or conversion factor shown for context.
Sigma Lt
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Z Service
Reference formula or conversion factor shown for context.
Results
safety stock (units)
Sample size or count used in the calculation.
reorder point ROP (units)
Sample size or count used in the calculation.
average cycle stock (units)
The arithmetic mean -- sum divided by count.
SS = z · √(LT·σ_d² + d²·σ_LT²)
Reference formula or conversion factor shown for context.
service level z
The measured or computed level on the applicable scale.