经济订单量简称EOQ（Economic Ordering Quantity），是要将存货的保存成本和订单成本减至最低的订单量。

1. 订购成本不变。
2. 品项之年需求（或为月需求或任何周期皆可，此处以年需求为例）不变且为已知数
3. 没有大量订购之折扣
4. 下订单后即时收货

Economic order quantity (EOQ) is the order quantity that minimizes the total holding costs and ordering costs. It is one of the oldest classical production sche****ng models. The framework used to determine this order quantity is also known as Wilson EOQ Model, Wilson Formula or Andler Formula. The model was developed by Ford W. Harris in 1913, but R. H. Wilson, a consultant who applied it extensively, and K. Andler are given credit for their in-depth analysis.