Reorder Point & Safety Stock Calculator

Enter your average daily sales, demand variability, and supplier lead time to instantly compute your safety stock and reorder point.

How it works

Average Daily Sales (units)

Daily Demand Std Dev (units)

Average Lead Time (days)

Lead Time Std Dev (days)

Service Level

Runs entirely in your browser. Nothing is uploaded.

STEP 1

Provide your average daily sales and the standard deviation of daily demand (a measure of how much sales fluctuate day to day).

STEP 2

Enter your average supplier lead time in days and the lead time standard deviation, then choose a service level (e.g. 95%).

STEP 3

The calculator outputs your safety stock and reorder point — the inventory level at which you should place a new order.