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Calculates buffer inventory to prevent stockouts due to demand uncertainty or supply delays. Balances carrying costs against stockout costs.
Formel
Calculate: safety stock = z × std dev × √(lead time)
Trin-for-trin guide
- 1Determine demand variability (standard deviation)
- 2Set service level (95%, 99%, etc.)
- 3Find z-score for service level
- 4Calculate: safety stock = z × std dev × √(lead time)
Løste eksempler
Input
10/day, 5day lead
Resultat
50 units
Almindelige fejl at undgå
- ✕Over-stocking to prevent all possible stockouts
- ✕Not accounting for actual demand patterns
Ofte stillede spørgsmål
How much safety stock should I hold?
Depends on variability and service level; 95% service level typical, sometimes 99% for critical items.
What's the cost of stockouts?
Lost sales, customer dissatisfaction, emergency expedited shipping, and market share loss.
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