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Reorder point calculator for retail stock

Estimate the stock level that triggers a replenishment review using daily demand, delivery time and a buffer.

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Enter your figures, then calculate. Results use only these inputs and are not saved.

Formula and worked example

Average daily units × lead time in days + buffer units; rounded up to a whole unit.

Illustrative example: 6 units a day × 5 days + 12 buffer units = a trigger at 42 units.

Before you use the result

  • Use the time from placing an order to stock becoming available for sale, in calendar days. Match your daily sales average to the same calendar basis.
  • This is a trigger for review, not the quantity to order. Check open orders, transfers, minimum order quantities and shelf space before buying.
  • The estimate assumes steady average demand. Promotions, stockouts and changing delivery times need a separate review.

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