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Fill Rate Calculator

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The Fill Rate Calculator helps supply chain managers, inventory planners, and logistics teams measure how well they meet customer demand without backorders or stockouts. It shows the percentage of customer orders or units that are delivered in full and on time. A higher fill rate means better service, fewer missed sales, and happier customers. This calculator is part of the Inventory Performance and Order Fulfillment Calculator category and is widely used in retail, manufacturing, and distribution.

formula of Fill Rate Calculator

Fill Rate = (Number of Units Delivered on Time / Number of Units Ordered) × 100

or equivalently,
Fill Rate = (Number of Orders Filled Completely / Total Number of Orders) × 100

Where:
Number of Units Delivered on Time means total units shipped and received by the customer when needed
Number of Units Ordered means total units requested in the original order

Or, when tracking by order lines instead of units, the second formula shows how many entire orders were shipped without any shortages.

Common Fill Rate Benchmarks Reference Table

This table shows typical fill rate targets for different industries and helps you see if your rate meets the standard.

IndustryTypical Fill Rate (%)Notes
Retail Stores95–98High customer expectations for shelf stock
Wholesale Distribution90–95Balances cost and service
Manufacturing Supply85–95Depends on supplier reliability
E-commerce Fulfillment97–99Competes on fast, full delivery

Meeting or exceeding industry fill rate standards helps keep customers loyal and operations running smoothly.

Example of Fill Rate Calculator

Let’s check a practical example.

Suppose a distributor received orders for 10,000 units in a month but could only ship 9,600 units on time.

  1. Use the unit-based formula:
    Fill Rate = (9,600 / 10,000) × 100
    Fill Rate = 0.96 × 100
    Fill Rate = 96%

So, this means 96% of customer demand was fill completely and on time.

Alternatively, if you look at entire orders:
Suppose 180 out of 200 orders were ship without any missing items.

Fill Rate (by orders) = (180 / 200) × 100 = 90%

Both methods show useful insights for supply chain planning.

Most Common FAQs

Why is the fill rate important?

The fill rate shows how reliably a company meets customer demand. A low fill rate means missed sales, backorders, and unhappy customers, while a high fill rate boosts satisfaction and repeat business.

What is a good target fill rate?

Most businesses aim for at least 95% or higher, but the ideal number depends on your industry and customer expectations. Critical industries like healthcare may require nearly 100%.

How can I improve my fill rate?

Use better demand forecasting, keep safety stock for fast-moving items, work with reliable suppliers, and monitor inventory levels closely. Automation tools can help track real-time stock and reduce errors.

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