Safety stock calculator

Extra units to cover demand and lead time swings. Change any number and the answer updates as you type.

1.65 is about 95% in stock. 2.33 is about 99%.

units
days

Safety stock = 99 units

What this calculates

Safety stock is extra inventory held to cover variation in demand and supplier lead time.

Safety stock = Z × σ(daily demand) × √(lead time in days)