Inventory turnover is an important KPI within inventory management and logistics. It shows how many times your average inventory is sold and replenished during a given period. Healthy inventory turnover helps companies control storage costs, use working capital more efficiently, and prevent stock shortages or excess inventory.
For organizations in retail, e-commerce, and other sectors, insight into inventory turnover provides valuable information about the performance of their supply chain.
What is inventory turnover?
Inventory turnover, also known as the inventory turnover ratio, indicates how many times inventory is completely sold and replenished during a specific period.
When products are sold quickly, inventory turnover is high. When goods remain in storage for a long time, inventory turnover is lower.
Inventory turnover is used to gain insight into:
- The efficiency of inventory management
- Product demand
- Storage costs
- Capital tied up in inventory
- Supply chain performance
Good inventory turnover helps companies find the right balance between product availability and inventory costs.
How do you calculate inventory turnover?
The most commonly used formula for inventory turnover is:
Inventory Turnover = Cost of Goods Sold ÷ Average Inventory Value
The Cost of Goods Sold (COGS) refers to the total cost of the products sold during a given period.
The average inventory value is usually calculated by adding the opening inventory and closing inventory together and then dividing the result by two.
The formula for average inventory value is:
Average Inventory = (Opening Inventory + Closing Inventory) ÷ 2
By combining both calculations, you obtain a clear picture of how quickly inventory moves through your organization.
Inventory turnover calculation example
Suppose a company sells €1,000,000 worth of goods in one year.
The inventory value is:
- Opening inventory: €180,000
- Closing inventory: €220,000
The average inventory value is therefore:
€200,000
The inventory turnover is then:
€1,000,000 ÷ €200,000 = 5
The inventory turnover in this example is therefore 5.
This means that the entire inventory is sold and replenished an average of five times per year.
What is a good inventory turnover?
There is no universal benchmark for good inventory turnover. It varies by industry, product category, and business model.
Retail and e-commerce companies often have higher inventory turnover than organizations dealing with specialized or slow-moving products.
In general:
- Low inventory turnover may indicate excess inventory or limited demand.
- Healthy inventory turnover indicates an efficient balance between demand and inventory levels.
- Very high inventory turnover may indicate inventory levels that are too low and an increased risk of stock shortages.
It is therefore important to always evaluate inventory turnover within the context of your own market and product range.
Why is inventory turnover important?
Inventory turnover affects multiple parts of the supply chain.
Lower storage costs
Products that remain in storage for a shorter period require less warehouse space and result in lower storage costs.
Better cash flow
Higher inventory turnover means less capital is tied up in inventory. This creates more financial flexibility for investments and growth.
Lower risk of obsolescence
Particularly in sectors such as fashion, retail, and technology, products can quickly become obsolete. Healthy inventory turnover helps reduce this risk.
More insight into performance
Inventory turnover shows which products perform well and which items may be occupying too much storage space.
How can you improve inventory turnover?
Improving inventory turnover starts with gaining better insight into demand patterns and inventory levels.
Optimize inventory management
Up-to-date inventory data helps prevent excess inventory. Professional warehousing supports companies in managing and monitoring inventory flows.
Improve demand forecasting
By analyzing historical data and sales trends, inventory levels can be better aligned with actual demand.
Reduce slow-moving inventory
Regular analyses help identify products with low turnover in a timely manner.
Increase operational efficiency
Professional fulfillment services can contribute to more efficient order processing and better inventory availability.
How does a logistics partner support this?
Inventory management is becoming increasingly complex due to expanding product assortments, international distribution, and higher customer expectations. As a result, it is becoming increasingly important to have insight into inventory performance and to continuously optimize inventory levels.
A logistics partner can provide support with real-time inventory management, efficient warehousing processes, and clear reporting. This creates greater control over inventory levels and the flow of goods.
Many organizations therefore choose integrated solutions such as contract logistics. By aligning warehousing, order processing, and distribution, a more efficient supply chain is created with greater control over inventory performance.
Inventory turnover is therefore not only a financial KPI but also an important indicator of the health and efficiency of your logistics processes.
