Reorder point calculator
Find the stock level where you should place your next order, so it lands before you run out instead of after. Enter three numbers. The math is shown in full, with no black box.
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The reorder point formula
A reorder point is the stock level that should trigger your next purchase order. Hit it, and you order. The idea is to place the order early enough that the new stock arrives just as you would have run out, so you never sell through to zero and never sit on months of excess.
safety stock = average daily sales × safety buffer in days
There are two parts. The first, lead-time demand, is how many units you expect to sell while you wait for the order to arrive. If you sell 10 a day and the supplier takes 14 days, you will sell about 140 units before the shipment lands, so you need at least that many on the shelf when you place the order.
The second part, safety stock, is your cushion. Sales are never perfectly flat and shipments are sometimes late, so you hold a few extra days of cover. Expressing that buffer in days keeps it honest: 7 days of safety buffer at 10 units a day is 70 units. Add the two together and you get a reorder point of 210 units.
How to get your average daily sales
Take a recent, representative period and divide. If you sold 300 units over the last 30 days, that is 10 units a day. Pick a window that reflects normal trading, and if your product is seasonal, lean on the same season last year rather than a quiet month.
Choosing a safety buffer
The right buffer depends on how spiky your demand is and how reliable your supplier is. A steady seller from a dependable supplier might need only a few days. A product with erratic sales or a supplier prone to delays might warrant two weeks or more. Start conservative, then tighten it once you have watched a few cycles.
From reorder point to order quantity
The reorder point tells you when to order. It does not tell you how much. Order quantity depends on your target cover, supplier minimums, and what is already on the way. A full replenishment tool works both out for every variant at once, subtracts what is on hand and on order, and flags the items that crossed their reorder point today. That is what Restockly does, using the same transparent math you see here, so you can check any number by hand.
Read the full reorder points guide, or see how Restockly automates this.