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How to Calculate Inventory Turnover Ratio in One Minute

Miranda Hartley
February 13, 2025

Why Calculate Inventory Turnover?

Inventory turnover (sometimes known as the stock turnover ratio) is a financial ratio that measures how many times a business has turned over its inventory within a given period. It’s an efficiency ratio, which measures how effectively a company utilises its resources.

The inventory turnover ratio isn’t just about how effectively a business sells its inventory. By analysing its inventory turnover, a business can make the best decisions about the following:

  • Reducing its holding costs for inventory
  • Cycling raw materials to prevent expiration and minimise waste, avoiding depreciation
  • Forecasting accurate inventory needs based on market demand
  • Maintaining liquidity by converting cash into inventory

In other words, it’s an important strategic ratio that requires accurate calculation.

How to Calculate Inventory Turnover (the long way)

You can manually calculate the inventory turnover, although it may be a two-step process depending on whether you need to calculate the average inventory. For example, you might need to calculate the average inventory turnover for financial reporting or to ascertain a quick review of your company’s health.

1. Find the values

Find the Cost of Goods Sold (COGS) and the change in inventory under the ‘Current Assets’ in the income statement. The COGS will include the change in inventory (rather than existing as a separate account).

  • Here’s an example: Let’s say your COGS is £750,000. Then, the beginning inventory at the start of the year is £100,000, and your end-of-year inventory is £150,000. 

2. Calculate the average inventory

Add the beginning and ending inventory values and divide by the total time period.

  • The average inventory is therefore £125,000 (£100,000 + £150,000 ÷ 2).

3. Divide COGS by the average inventory

Hopefully, you will arrive at a value between 5 and 10, which reflects a healthy inventory turnover ratio (we’ll cover what a ‘healthy’ inventory turnover ratio means below).

  • Here, let’s divide £750,000 by £125,000. The answer is 6, which means the stock gets replenished six times a year. The inventory turnover ratio appears healthy, indicating that your company is efficiently managing its stock.

What is a Healthy Inventory Turnover Ratio?

The ideal inventory turnover rate varies by industry, as different sectors have unique stocking and sales patterns. For example, an inventory turnover ratio between 5 and 10 means the stock is overturned every one to two months. However, for some industries like groceries and pharmacies, the turnover will be higher due to spoilage.

Calculating Inventory Turnover: How Long Does it Take?

End to end, the calculation process might take a few minutes, but the following processes can slow it down: 

  • Copying the financial data into an Excel spreadsheet
  • Validating the calculation
  • Formatting the data
  • Cross-referencing figures with source documents for consistency
  • Sharing or exporting the calculation

These processes make a relatively simple ratio calculation more arduous and time-consuming. Instead of considering what inventory supplies mean, relating to management, strategy and efficiency, talented analysts routinely waste time copying and pasting data and touching up spreadsheets.

However, we’ll show you how to calculate these ratios in under one minute.

Automating the Inventory Turnover Ratio Accurately with AI

Automation offers an accurate and swift way to complete these calculations. Now, there are a variety of AI-powered tools that can ‘read’ financial data like an analyst. Yet, ChatGPT may not be the answer.

Why not ChatGPT/other Virtual Assistants?

Commercial AI models struggle to offer specialised, high-quality financial & business advice. Instead, they tend to veer towards generic platitudes.

Instead, AI is better for analytical functions, such as locating, extracting and calculating data. There are now a variety of specialised financial data tools that leverage trained AI. One example of such a tool is Financial Statements AI.

Using Financial Statements AI

Let’s discuss how our analytical tool, Financial Statements AI, can reduce inventory turnover calculation to under one minute.

  1. Click to upload the income statement securely.
  2. Click to view the data, which includes the extracted line items and structured financial data. The structured financial data includes COGS and inventory values – the input values for the inventory turnover ratio.
  3. Download the data instantly to your device as an Excel spreadsheet.
  4. Use these input values to calculate inventory turnover directly in Excel.

Financial Statements AI reduces inventory turnover calculation to under one minute and removes the ‘grunt work’ (i.e. formatting and structuring the data). Alongside the inventory turnover metrics, Financial Statements AI also captures all the other line items from an income statement, using them to compute other metrics like Operating Expenses (OPEX), Pretax Income and EBIT.

Summary + Try Financial Statements AI Now.

The inventory turnover ratio indicates a company’s efficiency in converting inventory into sales over a given period. Calculating the inventory turnover ratio requires carefully parsing the inventory values, which may prove time-consuming for busy analysts. 

Reducing the calculation process to under one minute will give analysts time to analyse the data rather than repeatedly adding and subtracting values.

Interested in trying Financial Statements AI for free? Get started now.

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