Calculate how much buffer stock to keep and when to reorder
Enter Your Data
How many units you sell or use on an average day
How much daily demand varies (if unsure, use 20-30% of average demand)
How many days between placing an order and receiving it
How confident you want to be about not running out
Results
Safety Stock
—
units (buffer)
Reorder Point
—
units (order trigger)
Lead Time Demand
—
units used during lead time
Days of Buffer
—
days of extra cover
Formulas used: Safety Stock = Z × σ × √L Reorder Point = (Avg Daily Demand × Lead Time) + Safety Stock
where Z = service level factor, σ = std dev of daily demand, L = lead time in days.