Calcolatore Scorta di Sicurezza Gratuito
Calcola la scorta di sicurezza per prevenire le rotture di stock e mantenere i livelli di servizio. Strumento gratuito.
Safety Stock
270
Safety Stock vs Maximum Lead Time (days)
Formula
How to Calculate Safety Stock
Formula
Safety Stock = (Max Daily Demand x Max Lead Time) - (Avg Daily Demand x Avg Lead Time)
This is the Heizer and Render method, one of the simplest safety stock formulas. It accounts for the worst-case scenario: peak demand occurring during the longest possible lead time. The difference between this worst case and the average case is the buffer you need. More sophisticated methods use standard deviations and service level targets, but this approach works well for businesses without detailed statistical data.
Esempio Risolto
Average daily demand is 40 units but can spike to 55. Average lead time is 7 days but can stretch to 10.
- 01Max Demand During Lead Time = 55 x 10 = 550 units
- 02Avg Demand During Lead Time = 40 x 7 = 280 units
- 03Safety Stock = 550 - 280 = 270 units
Domande Frequenti
What happens if I carry too much safety stock?
Excess safety stock ties up capital, increases holding costs, and raises the risk of obsolescence. The goal is to carry just enough to hit your target service level without over-investing in buffer inventory.
How do I determine max demand and max lead time?
Review historical data over at least 6-12 months. Look at the highest daily demand recorded and the longest lead time experienced. Some businesses use the 95th or 99th percentile instead of absolute maximums to avoid overstocking.
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