What is inventory turnover ratio?
The inventory turnover ratio tells you how efficiently a business converts its stock into sales. A high reading signals products that sell quickly, while a low reading often points to items sitting idle on the shelf. Operators track it to catch slow-moving stock early and free up cash, since it weighs cost of goods sold against average inventory.
The stakes are real. According to IHL Group’s 2026 research, global inventory distortion from out-of-stocks and overstocks reached $1.7 trillion in retail during 2026, about 6.2% of global retail sales.
Key characteristics
- The formula: COGS divided by average inventory, where average inventory equals (beginning inventory + ending inventory) / 2.
- What high vs. low means: high points to fast-moving stock and less idle capital; low can signal overstock or weak sales. Push it too high and you risk stockouts, so focus on optimizing your turnover ratio.
- It is industry-relative: there is no single “good” number. NYU Stern data shows grocery and food retailers hold about 5.5% of sales in inventory, versus roughly 29% for aerospace and defense, measured as a share of sales.
- It reflects real-economy levels: U.S. Census Bureau data put the total business inventories-to-sales ratio at 1.30 in July 2026, meaning companies held about 1.3 months of goods relative to sales.
- It ties to carrying cost: APQC benchmarking data shows a cross-industry median inventory carrying cost of 10% of inventory value, so slow turnover leaves cash locked in holding costs.
Example
A craft cold-brew coffee roaster reports COGS of $500,000 and average inventory of $100,000 over the year. Divide $500,000 by $100,000 and the ratio is 5. That means the roaster sells and replaces its stock five times a year.
Source: Fishbowl. Fishbowl’s guide to calculating and optimizing the inventory turnover ratio.
Related terms
- days sales in inventory, the inverse view of the same movement.
- economic order quantity
- safety stock
- inventory optimization
FAQ
What is a good inventory turnover ratio? There is no universal number, because the right target depends on your industry and product mix. Compare against your own history and industry peers rather than a fixed benchmark.
Is a higher inventory turnover ratio always better? Not always, since a very high ratio can mean you are understocking and risking stockouts. Aim for a balance that meets demand without tying up cash.
How is inventory turnover ratio different from days sales in inventory? Turnover counts how many times you sell and replace stock in a period, while days sales in inventory expresses roughly how many days that stock sits before selling; they are inverse views of the same movement. Inventory software like Fishbowl can track turnover automatically as sales and purchases post.