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# Inventory reorder point calculator

Enter demand, lead time, and a service level to get your reorder point, safety stock, and days of cover with every step of the working shown.

Enter demand and a lead time to get a reorder point.

The reorder point is when to order, not how much: it is the demand you expect to serve during the lead time plus safety stock for the days the world runs late. The working assumes demand and lead time vary independently and roughly normally; a seasonal product invalidates any static reorder point, and periodic review (checking stock on a schedule) needs the review interval added to the lead time. Position here means on hand plus on order minus back orders; if you track back orders, subtract them yourself before entering.
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