Use observed demand and supplier lead times to estimate the buffer that protects you from a plausible worst-case period.
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Safety stock = (maximum daily usage × maximum lead time) − (average daily usage × average lead time). It is easy to use with historical observations, though highly seasonal or service-level-driven operations may need a statistical model.
The tool adds average lead-time demand to safety stock. Reorder point = average daily usage × average lead time + safety stock.
That means the maximum scenario entered does not exceed the average lead-time demand. Recheck that maximum demand and lead time are realistic and measured over comparable periods.