Inventory Turnover Calculator

What is Inventory Turnover Ratio?

The Inventory Turnover Ratio measures how many times a business sells and replaces its stock of goods over a given time period (typically one year). It is a key supply chain and financial metric that indicates how efficiently a business manages its inventory.

Inventory Turnover Formulas

The ratio is calculated by dividing the Cost of Goods Sold (COGS) by the average inventory value:

$$\text{Inventory Turnover Ratio} = \frac{\text{COGS}}{\text{Average Inventory}}$$

Where average inventory is:

$$\text{Average Inventory} = \frac{\text{Beginning Inventory} + \text{Ending Inventory}}{2}$$

Days Sales of Inventory (DSI)

Days Sales of Inventory (DSI), also known as Days Inventory Outstanding (DIO), calculates the average number of days it takes to turn inventory into sales:

$$\text{DSI} = \frac{365}{\text{Inventory Turnover Ratio}}$$

Interpreting Inventory Turnover Rates

High Turnover Ratio: Signals strong sales, effective inventory control, and minimal capital tied up in unsold stock. However, an excessively high ratio might lead to stockouts.
Low Turnover Ratio: Indicates weak sales, overstocking, or obsolescence of inventory.

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Frequently Asked Questions

Why is COGS used instead of Total Revenue?

COGS is used because inventory is recorded on the balance sheet at cost value, not retail selling price. Using COGS avoids distortion caused by retail markups.

What is considered a good inventory turnover ratio?

Ideal inventory turnover ratios vary widely by industry. Grocery stores may have turnover ratios above 14x, while luxury retail or car dealerships typically have turnover ratios between 2x and 4x.

How can a company improve its inventory turnover?

Businesses can improve inventory turnover by optimizing demand forecasting, reducing dead stock, negotiating smaller frequent orders with suppliers, and running promotional clearance sales.

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