Fill Rate
Fill rate is the percentage of customer demand satisfied immediately from available inventory, without backorders, stockouts, or partial shipment delays. It is calculated as total orders shipped divided by total orders placed, multiplied by 100. Supply chain teams use it as a service-level metric to show how often orders, lines, or units ship on the first pass from stock on hand.
Fill rate on a manufacturing shop floor measures whether a kitting area or production line can pull all required components for a work order without substitutions or expedites. In warehousing, it tracks how many customer orders and internal replenishment requests ship complete from stock. Procurement teams use it for raw material tracking to judge supplier reliability against requested quantities, showing whether material arrives ready for immediate consumption. A low fill rate reveals inventory record inaccuracy, bin misplacement, incorrect safety stock, late receiving, poor lot allocation, or demand spikes exceeding replenishment lead time. The metric is most valuable when segmented by supplier, SKU, warehouse zone, customer, and order type, and when paired with backorder and stockout rates to separate unavailable demand from material available but not picked correctly. Tying fill rate to A-items and critical BOM components isolates failure in procurement, receiving, putaway, picking, or replenishment before shortages stop work orders.
What does a 92% fill rate mean in a warehouse?
It means 92% of the measured demand units, order lines, or orders were fulfilled immediately from available inventory, while the remaining 8% required backorder, split shipment, or were not fulfilled on the first attempt.
Why can fill rate and service level differ?
Some sources treat fill rate as unit-based fulfillment while service level is order-based, so a warehouse can ship many units correctly but still miss complete-order service targets on shorted lines.
Which fill rate variant is most useful for manufacturing?
Line fill rate is often most actionable for production support because a single missing component line can stop a work order, even if most lines in the order are filled.