Reorder Point (ROP) Optimization

A reorder point is a threshold used to trigger replenishment. A common continuous-review policy orders when inventory position reaches or falls below the threshold. Inventory position is typically on-hand stock plus outstanding replenishment minus backorders; system definitions may treat allocations differently.

A simple threshold is expected demand during replenishment lead time plus safety stock. At 100 units per day, five days of fixed lead time, and an independently chosen 74-unit buffer, the illustrative threshold is 574 units. On-hand stock alone can trigger duplicate ordering if replenishment already in transit is ignored.

The trigger does not determine order quantity, supplier capacity, or arrival certainty. Minimum order quantities, review frequency, uncertain lead times, and forecast errors affect the policy. “Optimization” requires an objective and constraints, such as service performance versus inventory cost; inserting values into a formula is not evidence that the policy is optimal.

Related reference: Oracle inventory planning and reporting documentation. Examples and calculations here are illustrative.