The inventory turnover ratio formula
The inventory or stock turnover ratio formula is simple. You just need to divide the company’s Cost of Goods Sold (COGS) over a given period by the average inventory held during that period. The COGS tells you the cost of sales, while the average inventory gives you some idea about how much stock the company held, on average.
Check out the inventory turnover formula below.
Inventory turnover ratio = Cost of goods sold ÷ Average value of inventory
To find the average inventory value, you can simply add the beginning and the ending inventory levels during the period concerned and divide this sum by 2. This leads us to the formula shown below:
Average value of inventory = (Beginning inventory + Ending inventory) ÷ 2
If you know the COGS and beginning and ending inventory levels, computing the stock turnover ratio is extremely easy. Let us discuss an example to make this clearer.
How to calculate the inventory turnover ratio: An example
Say a company has the following relevant data points for the financial year 2026-27.
- Cost of goods sold: Rs. 24,00,000
- Inventory value at the beginning of the financial year: Rs. 5,00,000
- Inventory value at the end of the financial year: Rs. 3,00,000
- Using the above data, let us first find the average inventory before calculating the inventory turnover ratio. The average inventory will be Rs. 4,00,000 [i.e., (Rs. 3,00,000 + Rs. 5,00,000) ÷ 2].
- Substituting this value in the stock turnover ratio formula, we can find the inventory turnover ratio, which is:
= Cost of goods sold ÷ Average value of inventory
= Rs. 24,00,000 ÷ Rs. 4,00,000
= 6
Why is inventory turnover important?
Understanding inventory turnover is crucial because it measures how efficiently a company sells and replaces stock, directly impacting cash flow, profitability, and operational efficiency. A high turnover indicates strong sales and low holding costs, while a low ratio flags potential overstocking, weak demand, or excessive storage expenses.
No retailer wants to waste money and resources on unnecessary storage costs. Likewise, no retailer wants to underestimate consumer demand. So, rather than relying on guesswork, retailers can aim to optimise their inventory turnover rates.
The benefits are numerous. Understanding inventory turnover ratios can help increase profitability and make better long-term business decisions.
What the inventory turnover ratio can tell you?
Knowing the meaning of inventory turnover and how to calculate it is one thing, but it’s also crucial to understand what this ratio tells you. In the simplest terms, the inventory or stock turnover ratio tells you how many times or how frequently a company has to replace its inventory.
It is assumed that such replacement generally stems from the sale of existing inventory. So, a high inventory turnover ratio is considered to be a favourable indicator of a company’s efficiency. Conversely, a low stock turnover ratio may be a sign of overstocking or inefficiencies in product sales. This is a red flag for investors and other stakeholders.
In the above example, an inventory turnover ratio of 6 indicates that in the financial year concerned, the company sold and replaced its inventory 6 times.
Also read: What is trading volume?
What is a good inventory turnover level?
There is no universally optimal inventory turnover ratio. The appropriate level varies based on a company’s operating model, industry benchmarks, and the type of products it handles.
Businesses dealing in low-priced, fast-moving items such as groceries may function efficiently with a high turnover ratio of 12 or above. In contrast, companies selling moderately priced goods that move at a slower pace, such as furniture or appliances, may consider a ratio between 5 and 12 reasonable. For enterprises handling expensive or specialised products, the inventory turnover ratio may typically remain below 5, reflecting longer sales cycles and higher unit values.
Limitations of the inventory turnover ratio
One of the key limitations of the stock turnover ratio is that it varies greatly across industries. So, there is no standard scale to tag a ratio as good or bad at first glance. Additionally, the concept of inventory turnover may not translate smoothly to companies with a diverse product mix. High-margin products may be deliberately held for longer to increase the returns, and this could affect the stock turnover ratio.
So, while it can help to assess and factor in inventory turnover, make sure you look into these aspects and understand the nature of the company’s inventory policies in-depth.
Conclusion
Despite these limitations, the bottom line is that the inventory turnover ratio, which is one of the many different efficiency ratios, can be very useful for investors. Other ratios in this category include the asset turnover ratio, accounts receivable turnover ratio and more.
By analysing such efficiency ratios before investing in a company, you can understand its operational efficiency and evaluate its liquidity better. What’s more, you can also gain insights into the company’s profitability and perform a comparative analysis of the entity with its peers.
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