Patent ID: 7933805

Claim:
A safety stock amount calculation device, comprising: a storage unit, the storage unit including a non-transitory computer-readable recording medium storing a program; and at least one processor configured to operates as: a delivery time appearance probability calculation section that calculates an appearance probability of a certain delivery time based on a delivery time for a certain commodity required by a customer and frequency; a lead time appearance probability calculation section that calculates an appearance probability of a lead time of the commodity or components of the commodity; an effective lead time calculation section that calculates, based on the customer's required delivery time and lead time, an effective lead time T i that denotes a period between a time when it has been predicted that the commodity stock will fall below a corresponding reorder point and a time when the commodity has become available after the commodity had been ordered based on the prediction that the commodity stock would fall below a corresponding reorder point; an effective lead time appearance probability calculation section that calculates an appearance probability of the effective lead time T i based on the appearance probability of the customer's required delivery time and the appearance probability of the lead time; and a safety stock amount calculation section that calculates a safety stock amount ss based on a demand standard deviation σ D for a certain commodity per unit of period, a safety coefficient k that denotes the level of a ratio of service S for demand, the effective lead time T i and the appearance probability of the effective lead time.