Optimaler Bestellzeitpunkt
Also: Bestellzeitpunkt, Optimaler Bestellpunkt, Nachbestellzeitpunkt, Bestelltrigger, Bestellauslösezeitpunkt
AI-generated
The optimal reorder point refers to the moment at which a replenishment order must be triggered so that neither stock shortages occur nor unnecessarily high inventory levels are built up. It takes into account replenishment lead time, current stock, and safety stock.
Key facts
- The optimal reorder point is typically controlled via a reorder level that combines consumption, lead time, and safety stock.
- The reorder point and order quantity must be parameterized together, as both directly influence inventory levels and delivery readiness.
- Fluctuating replenishment lead times and unreliable suppliers increase the required safety stock and shift the optimal reorder point forward in time.
- The appropriate method for determining the reorder point depends on item classification, planning frequency, and the quality of consumption data.
What is the optimal reorder point?
The optimal reorder point is the moment in the inventory cycle at which an order should be triggered so that goods arrive in time – that is, before stock falls below a critical level, but without ordering too early and thereby tying up capital unnecessarily. It is not a fixed calendar date; rather, it arises dynamically from the interplay of current inventory levels, projected consumption, replenishment lead time, and safety stock.
How is the reorder point determined in practice?
The most widely used method is reorder point logic: as soon as available stock – meaning inventory on hand plus open inbound quantities minus reserved quantities – reaches or falls below a defined reorder level, an order is triggered automatically. The reorder level is calculated in simplified terms as average daily consumption multiplied by lead time, plus a safety stock buffer that absorbs fluctuations in both consumption and delivery time.
In procurement planning, the following factors also play a role:
- Planning frequency: Whether planning is carried out daily, weekly, or in real time affects how precisely the reorder point can be hit.
- Supplier reliability: If replenishment lead times vary significantly, the safety stock – and therefore the reorder level – must be set correspondingly higher.
- Call-off models and framework agreements: In just-in-time call-offs or Kanban systems, the physical or electronic call-off replaces the traditional reorder point.
- Reservations and order forecasts: A modern WMS or ERP system should factor open customer orders and production requirements into available stock in order to avoid phantom inventory.
What matters when selecting the right method?
Not every method suits every item. For high-value A-items with predictable consumption, a closely monitored, demand-driven calculation is worthwhile. For low-value C-items with stable consumption, a simple reorder level with a generous safety stock is often sufficient. ABC or XYZ item classification therefore provides a sensible basis for parameter setting.
It should also be noted that the reorder point and order quantity are closely linked: a reorder point triggered too early in combination with large order quantities leads to excess inventory, while a trigger that fires too late causes supply shortages. Both parameters must be optimized together. Which method is more appropriate in any given case depends on the system landscape, data quality, and supplier agreements – blanket recommendations fall short here.
Related terms
- ABC-Analyse
ABC analysis is a method for classifying items, vendors, or processes into three priority classes (A, B, C) based on their economic significance. It forms the basis for differentiated decision-making in warehousing, inventory management, and procurement.
- Absatzprognose
The sales forecast estimates future demand for products or items over a defined period. It forms the basis for inventory, capacity, and procurement planning in logistics and purchasing.
- Bedarfsermittlung
Requirements planning refers to the systematic process by which an organization's future material or goods requirements are determined in terms of quantity and timing. It forms the basis for inventory management, procurement, and warehouse planning.
- Bedarfsplanung
Demand planning refers to the systematic process by which a company determines what quantities of materials, goods, or resources are needed and when. It forms the foundation for inventory management, procurement, and warehouse planning.
- Beschaffungsplanung
Procurement planning refers to the process by which a company systematically determines which materials or goods need to be sourced, in what quantities, at what time, and from which suppliers.
- Bestandsführung
Inventory management refers to the system-supported administration and continuous updating of all warehouse and material stocks within a company. It forms the basis for planning, procurement and accounting – and ensures that the book inventory and physical inventory are in agreement at all times.
- Bestandsmanagement
Inventory management refers to the systematic planning, control, and monitoring of stock levels across the entire supply chain. The goal is to ensure delivery capability while keeping capital commitment and warehousing costs within economically viable limits.
- Bestellpunktverfahren
The reorder point method is a replenishment procedure in which an order is automatically triggered as soon as the current stock level falls below a predefined reorder point.
- Disposition
Disposition refers to the operational planning and control of resources, quantities, and orders in logistics – for example in transport or materials disposition. It encompasses capacity assignment, scheduling, prioritization, and response to disruptions.
- Sicherheitsbestand
Safety stock is a calculated buffer inventory held in excess of the statistically determined demand in order to prevent shortages in the event of unforeseen demand fluctuations or delivery delays.