Reorder Point Calculator

Reorder Point (ROP) = (Average Daily Demand × Lead Time in Days) + Safety Stock. The first part (Average Daily Demand × Lead Time) is the demand during lead time — the inventory you expect to consume while waiting for a new order to arrive. Safety stock is added as a buffer against demand spikes or supplier delays. When your inventory level hits the reorder point, place a new purchase order immediately.

Safety stock is a buffer inventory held to absorb demand variability and supply uncertainty — it is the cushion that prevents stockouts when demand is higher than expected or the supplier delivers late. Reorder point (ROP) is the inventory trigger level at which you place a new order. ROP includes safety stock but also covers the expected demand during the replenishment lead time. Safety stock is a component of ROP, not the same thing. You can have zero safety stock and still have a reorder point (it just means no buffer for variability).

Reorder points should be reviewed whenever your demand pattern or lead times change significantly. Best practice is to recalculate ROPs monthly for fast-moving SKUs and quarterly for slow-movers. Seasonality is a critical factor — ROPs for seasonal products should be adjusted 4–6 weeks before demand peaks. AI-powered inventory systems like OpsOracle automatically recalculate ROPs in real-time as demand signals and supplier lead times change, eliminating the need for manual review cycles.