Inventory Turnover Ratio

The Inventory Turnover Ratio tells you how many times a business sells and replaces its stock of finished goods during an accounting period. It measures the speed with which inventory is converted into revenue from operations — in other words, how efficiently inventory is being used.

This ratio expresses the relationship between the cost of revenue from operations (the actual cost of the goods that were sold) and the average inventory held during the period.

What each term means

Cost of Revenue from Operations is simply revenue from operations minus gross profit. When gross profit is not directly given, you can compute it as:

Cost of Revenue from Operations = Opening Inventory + Net Purchases + Wages + Carriage Inwards – Closing Inventory

This formula works because all the costs incurred to bring the inventory to a saleable condition (purchases, wages, carriage) are added to the opening stock, and the unsold stock at the end is subtracted. The result is the cost of the goods that were actually sold.

Average Inventory is the arithmetic mean of the opening and closing inventory:

Average Inventory = (Inventory in the beginning + Inventory at the end) / 2

Significance of the ratio

The Inventory Turnover Ratio serves two main purposes:

• It studies the frequency of conversion — how often finished goods are turned into revenue. A high turnover generally indicates that goods are selling quickly and inventory is being managed efficiently.
• It is a measure of liquidity — inventory is often the least liquid current asset, so how fast it turns over affects the firm's ability to meet short-term obligations.

Interpreting the result

• Low turnover is a danger signal. It may be caused by bad buying decisions, accumulation of obsolete or slow-moving stock, or poor sales performance. The business is tying up cash in inventory that isn't moving.
• High turnover is generally good, but it must be interpreted carefully. It could result from buying in very small lots (which may increase ordering costs) or selling quickly at a very low margin just to realise cash. A very high turnover might indicate under-stocking and lost sales. …