[Safety Stock Calculator]
Calculate the Right Inventory Buffer
Enter your demand pattern, lead time, and target service level to determine how much safety stock to carry. Balance stockout risk against inventory holding costs.
Input Parameters
units
units / day
days
Safety Stock
Safety Stock
88units
Avg Inventory
438units
Stockout Risk
5%
Inventory Detail
Days of Safety
0.9days
Avg Cycle Stock
350units
Lead Time Demand
700units
Z-Score
1.65
How It Is Calculated
SS = Z x σd x √L
How Safety Stock Works
SS = Z × σd × √L
Z
Service level z-score
90% → 1.28, 95% → 1.65
97% → 1.88, 99% → 2.33
σd
Demand standard deviation
Day-to-day demand variability
√L
Square root of lead time
Replenishment time in days
[Optimize Inventory]
Let WorkCell Calculate Safety Stock for Every SKU.
WorkCell analyzes demand variability and lead times in real time - so your inventory buffers stay right-sized without manual spreadsheet work.