Supply Chain Fill Rate Calculator
Fill Rate Calculation Example & Guide
In supply chain management and inventory control, Fill Rate is a critical Key Performance Indicator (KPI) that measures the percentage of customer demand that is met through immediate stock availability, without backorders or lost sales. It essentially answers the question: "Of all the orders we received, how many did we successfully ship on time?"
The Fill Rate Formula
The calculation for fill rate is straightforward, though it can be applied to different units of measure (such as line items, cases, or individual units). The core formula is:
Where:
- Total Demand: The total number of orders or units requested by customers.
- Total Shipped: The actual number of orders or units delivered to customers from available inventory.
Practical Calculation Examples
To better understand how this metric works in a real-world warehouse scenario, consider the following examples:
Example 1: Unit Fill Rate
A clothing retailer receives orders for 5,000 t-shirts (Total Demand). However, due to stockouts on certain sizes, they are only able to ship 4,850 t-shirts immediately.
- Calculation: (4,850 / 5,000) × 100
- Result: 97% Fill Rate
- Interpretation: The company successfully fulfilled 97% of the unit demand, leaving 3% as backorders or lost sales.
Example 2: Order Fill Rate
A B2B distributor receives 200 separate purchase orders. They are able to ship 180 of these orders in full. The remaining 20 orders have at least one item missing.
- Calculation: (180 / 200) × 100
- Result: 90% Order Fill Rate
Why Fill Rate Matters
Tracking your fill rate is essential for maintaining customer satisfaction and optimizing inventory levels. A low fill rate indicates poor inventory planning, leading to lost revenue and dissatisfied clients. Conversely, consistently maintaining a 100% fill rate might suggest you are overstocking, which ties up capital in excess inventory holding costs. Most businesses aim for a "Service Level" target between 95% and 99% depending on the industry.
Types of Fill Rates
- Line Fill Rate: The percentage of order lines (specific items within an order) shipped in full.
- Case Fill Rate: Used often in FMCG, measuring the percentage of cases shipped versus ordered.
- Order Fill Rate: The percentage of complete orders shipped without any shortages.