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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)

Trinn-for-trinn guide

  1. 1Determine demand variability (standard deviation)
  2. 2Set service level (95%, 99%, etc.)
  3. 3Find z-score for service level
  4. 4Calculate: safety stock = z × std dev × √(lead time)

Løste eksempler

Inndata
10/day, 5day lead
Resultat
50 units

Vanlige feil å unngå

  • Over-stocking to prevent all possible stockouts
  • Not accounting for actual demand patterns

Ofte stilte spørsmål

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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