What is the order point in inventory management?

The key facts

• The order point (reorder point) = expected demand during lead time + safety stock — the quantity level that triggers a new purchase order.
• The inputs are three: average demand per period, supplier lead time, and demand/lead-time variability (the safety-stock ingredient).
• The point of the point: decisions made once, applied automatically — no Friday shelf-walk, no memory-based ordering.
• BSimple computes it continuously: reorder levels against live and incoming stock in the purchasing flow — no module fee, from $180/mo AUD.
• The full picture: the full order flow is the hub page for the order side.

The formula, and what each piece means

Order point = (average demand × lead time) + safety stock.

Average demand per period: how many you sell or consume per day or week, ideally from recorded history rather than impressions. Lead time: how long from placing the purchase order to the goods being usable — supplier shipping plus your own receiving and put-away time, which people routinely underestimate. Safety stock: the buffer for the variation in both — demand spikes and late deliveries — sized from that variability rather than from a feeling.

Worked example: you sell 10 units a day on average; the supplier takes 5 days; demand occasionally doubles and deliveries occasionally run late, so you carry 2 days of safety stock. The order point is (10 × 5) + (10 × 2) = 70 units. When live stock falls to 70 — and importantly, when live stock minus open promises falls to 70 — the next purchase order is due.

Why the concept matters more than the maths

The arithmetic is primary-school; the discipline is not. Two habits make order points real: the inputs must come from the record (demand from recorded sales, lead times from received purchase orders — not from the salesperson's optimism), and the trigger must be checked against commitments (70 on the shelf with 30 already promised is 40 available). The KPI connection is what keeps the inputs honest: fill rate and adjustment frequency expose when the assumptions drift.

The alternative to order points is memory — someone noticing shelves look light. Memory works at tiny volumes and fails silently at growing ones, which is why the order point is usually the first piece of operations management a business adopts after it has a record to compute it from. The toolkit context places it among the inventory models.

How software handles the order point

In a movement-based system, the order point stops being a Friday calculation and becomes a standing rule: par levels held per product, compared continuously against live quantities minus open orders plus incoming stock, with the reorder view showing what to buy now and what can wait. We build BSimple, so weigh that: its reorder view works exactly this way — par levels, live and incoming stock, shortage-aware purchase orders, GST-inc/ex-GST supplier reconciliation — inside plans from $180/$250/$399 per month AUD, with no module fee, and the trial runs one reorder cycle on your products. The stock-vs-inventory vocabulary and the recording-versus-managing line place the concept in the wider picture.