Supplier reorder point & EOQ calculator
Work out when and how much to reorder from each supplier. Enter annual demand, order and holding costs, lead time and target service level to get the economic order quantity, the reorder point and the safety stock that protects against stockouts.
Try the calculator
Supplier reorder: EOQ and reorder point
Enter up to 5 products. Get economic order quantity and safety stock. No sign-up needed.
Product 1
Enter the data and press Calculate to see EOQ and reorder point.
How to use it
- Enter annual demand, cost per order and holding cost per unit per year.
- Add the supplier lead time and (optionally) daily demand variability.
- Pick a service level and read EOQ, reorder point and safety stock.
How is the reorder point calculated?
Reorder point = expected demand during the lead time + safety stock. Safety stock is the service-level z-score times the demand standard deviation over the lead time, so a higher service level holds more buffer.
What is EOQ?
The economic order quantity is the order size that minimizes the sum of ordering and holding costs: EOQ = √(2·D·K/h), with D annual demand, K cost per order and h holding cost per unit per year.