Inventory Cost Rate – Definition, Calculation & Benchmarks

What is the Inventory Cost Rate?

Inventory cost rate describes the ratio of warehousing costs to the average inventory value and indicates how efficiently a warehouse is operated from a financial perspective. 

Formula

 (Storage costs ÷ average inventory value) × 100 

Example

Storage costs: €200,000
Inventory value: €1,000,000

→ Inventory cost rate = 20%

Benchmarks

• 15–25% → typical
• > 30% → inefficient
  
  
  

Significance

This KPI shows:

• capital tied up in inventory
• efficiency of warehouse operations
• optimization potential

Causes of high Costs

• high inventory levels
• inefficient processes
• low level of automation
  
  
  

Optimization

• inventory reduction
• process optimization
• automation
  
  
  

Typical Mistakes

 👉 Costs are often considered in isolation without taking service levels into account. 

Relation to other KPIs

• inventory turnover
• days of inventory
  
  
  

Practical Example

Reduction from 28% to 19%:

→ significant cost savings

❓ FAQ

Conclusion

The inventory carrying cost rate is a key metric for the financial management of warehouse operations.