What each method actually controls
Reorder point is the stock level that triggers a new order: (average demand during lead time) + safety stock. Once inventory drops to or below this number, it is time to reorder. Reorder point does not say how much to order — that is a separate decision, commonly made with an economic order quantity (EOQ) calculation.
Min/max sets two numbers for a SKU: the min (the trigger to reorder, functioning identically to a reorder point) and the max (the ceiling to restock up to). When stock hits min, the order quantity is simply max minus current stock — no separate calculation needed.
In practice, min in a min/max system and reorder point in an ROP/EOQ system are the same number, calculated the same way. The difference is entirely in what determines the order quantity: a fixed ceiling (max) versus a calculated batch size (EOQ).
When min/max fits, and when it does not
Min/max works well where restocking is routine and staff need a simple rule: "bring it back up to the max." It is common in retail shelf stock, hospitality par levels, and MRO/spare parts, where the cost of a slightly oversized order is low and the value of a simple, repeatable process is high.
It fits poorly for items with genuinely variable demand or high unit cost, because the max is fixed regardless of what demand actually looks like at reorder time. A max set for average demand overstocks in a quiet month and understocks in a busy one, and a high-value item restocked to a static ceiling can tie up more cash than the situation calls for.
Reorder point with a calculated order quantity handles that variability better, at the cost of being harder for staff to run manually — the order size is a number to calculate each time, not a fixed target to restock toward.
Choosing between them
For stable, low-to-moderate value, frequently restocked items: min/max, because the simplicity outweighs the small inefficiency of a fixed order size.
For high-value, long-lead-time, or demand-variable items: reorder point plus a calculated order quantity (EOQ or a demand-adjusted quantity), because getting the order size closer to actual need is worth the extra calculation.
Most catalogs use both, split by ABC classification: min/max on lower-priority C-items where simplicity wins, reorder point with calculated quantities on A-items where precision has real financial weight.
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