What is Stockout?
A stockout is a situation where an item is unavailable to meet demand because its on-hand inventory has reached zero.
Definition
A stockout occurs when there is no inventory available to satisfy a customer order or production requirement at the moment it is needed. Stockouts cause lost sales, backorders, expediting costs, production stoppages, and customer dissatisfaction, and frequent ones can permanently erode market share. They typically result from demand variability, supply delays, forecast error, or inadequate safety stock. Managing the trade-off between stockout risk and carrying cost is a central goal of inventory planning.
How Stockout Works in ERP
ERP systems help prevent stockouts by maintaining real-time availability, calculating safety stock and reorder points, and triggering replenishment before inventory hits zero. When a stockout does occur, the system can place the demand on backorder, suggest substitutes, or source from an alternate location. Reporting on stockout frequency and fill rate helps planners tune service-level targets and buffers.
ERP Vendors with Strong Stockout
Frequently Asked Questions
What is the difference between a stockout and a backorder?
A stockout is the condition of having zero available inventory for an item. A backorder is what happens to the unfulfilled demand: the order is accepted and held to be filled when stock arrives. So a stockout is the cause and a backorder is one possible consequence; the alternative consequence is a lost sale.
How do companies reduce stockouts?
Common levers include holding appropriate safety stock, improving forecast accuracy, shortening and stabilizing supplier lead times, and setting reorder points correctly. Better real-time visibility through perpetual inventory also helps trigger replenishment in time. The aim is to hit a target service level without overinvesting in inventory.