Waiting until a shelf is empty to reorder is too late. A supplier still needs time to fulfill the order. The reorder point solves this problem. It marks the stock level that triggers a new order. That order arrives on time, instead of after a stockout has already happened.

Why the Reorder Point Matters

Without a defined reorder point, businesses tend to reorder in one of two ways. They either reorder on a fixed schedule, regardless of how fast stock is actually moving. Or they eyeball the shelf, which is inconsistent and easy to get wrong. A proper reorder point ties the reorder decision to real usage and real supplier timing. That keeps stock flowing without excess buffer.

What Goes Into a Reorder Point

Three things determine where the reorder point should be set:

  • Average demand — how quickly the item typically sells or gets used.
  • Lead time — how long it takes for a new order to arrive once it's placed.
  • Safety stock — the buffer held in case demand or lead time runs higher than average.

Together, these answer one question: how much stock gets used up while waiting for the next order, plus a cushion for the unexpected? For the exact math, see our reorder point formula guide.

An Example

Consider an item that sells 15 units a day. It has a supplier lead time of 6 days and a safety stock of 20 units. The business needs enough stock to cover 6 days of sales (90 units), plus the safety buffer (20 units). That puts the reorder point at 110 units. Once stock drops to 110, it's time to order again.

Reorder Point vs Reorder Quantity

It's worth separating two related ideas. The reorder point answers "when should I order?" The reorder quantity answers "how much should I order?" It's often calculated separately, using a method like EOQ. Both work together, but they solve different questions.

Key Takeaways

The reorder point is the stock level that triggers a new purchase order. It's calculated from average demand, supplier lead time, and safety stock. Setting it correctly keeps orders arriving on time, without carrying more buffer stock than necessary.

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