bestelhoeveelheid

Bestelhoeveelheid is a Dutch term meaning order quantity. In inventory management, it refers to the amount of stock to order in a single replenishment cycle, with the aim of minimizing total costs by balancing ordering costs and holding costs.

In the classical Economic Order Quantity (EOQ) model, the optimal order quantity Q* is determined by the formula Q* = sqrt(2DS/H). Here, D is the annual demand, S is the fixed cost of placing an order, and H is the annual holding cost per unit. The model implies that total annual cost consists of two parts: ordering costs, which decrease as Q grows, and holding costs, which increase as Q grows. The point where these costs are minimized yields Q*.

Common assumptions of the EOQ framework include constant and known demand, fixed lead time, instantaneous replenishment, no stockouts, and no quantity discounts. Under these conditions, the bestelhoeveelheid provides a steady benchmark for procurement planning.

Extensions and variations address real-world complexities. These include the Economic Production Quantity (EPQ) model when production is ongoing rather than instantaneous, quantity discounts, safety stock for demand variability, and reorder-point models that incorporate service levels and lead-time uncertainty.

In practice, organizations use the bestelhoeveelheid as a starting point and adjust for factors such as supplier pricing, stockout costs, variability in demand, and service-level requirements. It remains a foundational concept in optimizing inventory performance.