Order Fill Rate Calculator
Find the percentage of demand you fulfilled.
Results update as you type.
How it works
Order fill rate measures how well you meet customer demand from available inventory, and this calculator finds it as a percentage. You enter the number of units you actually shipped and the number of units customers ordered, and it returns the fill rate. This metric is a core measure of service level and fulfillment performance in supply chain and inventory management. A fill rate of 95 percent, for example, means you shipped 95 of every 100 units ordered, leaving 5 unfulfilled because of stockouts or shortages. High fill rates keep customers satisfied and protect revenue, while low fill rates mean lost sales, backorders, and unhappy customers who may switch to competitors. There are several variants: unit fill rate, shown here, measures the share of individual units filled; line fill rate measures the share of order lines completely filled; and order fill rate measures the share of entire orders shipped complete. Companies balance fill rate against inventory cost, since carrying more stock raises fill rates but ties up capital, so the target fill rate is a strategic choice weighing service against cost. Track it over time and by product to spot where stockouts hurt you most. Enter units shipped and units ordered to compute your fill rate.
Fill rate = units shipped / units ordered × 100
Fill rate divides the number of units actually shipped by the number of units customers ordered, then multiplies by 100. It measures the share of demand you satisfied from available stock. A fill rate near 100 percent means you met almost all demand, while a lower rate signals stockouts and missed sales.
Source:Supply chain management
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter units shipped and units ordered.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Fill rate updates instantly as you type — no button to press.
Frequently asked questions
What is fill rate?
Fill rate is the percentage of customer demand you fulfill from available inventory, calculated by dividing units shipped by units ordered and multiplying by 100. It measures your service level and how effectively your stock meets demand. A high fill rate means few stockouts, while a low one signals lost sales and shortages.
How do you calculate order fill rate?
Divide the number of units shipped by the number of units ordered, then multiply by 100. If customers ordered 1,000 units and you shipped 950, the fill rate is 95 percent. The calculator does this instantly and can be applied per product, per order, or across a whole period to track fulfillment performance.
What is a good fill rate?
Many businesses target fill rates around 95 to 98 percent, balancing customer service against inventory cost. The ideal level depends on your industry, product criticality, and margins. Pushing fill rate toward 100 percent requires progressively more safety stock, so most companies choose a target that keeps customers satisfied without over-investing in inventory.
What are the different types of fill rate?
Unit fill rate measures the share of individual units shipped versus ordered, line fill rate measures the share of order lines filled completely, and order fill rate measures the share of entire orders shipped complete. Each gives a different view of service: unit fill rate is the most granular, while order fill rate is the strictest.
How can I improve fill rate?
Improve demand forecasting, carry appropriate safety stock, shorten supplier lead times, and prioritize reliable suppliers to reduce stockouts. Better inventory visibility and reorder timing also help. Because higher fill rates require more inventory, weigh the cost of extra stock against the value of the sales and customer loyalty that avoiding stockouts protects.