Inventory or Stock Turnover Ratio | Formulae | Significance

Inventory or Stock Turnover Ratio

Inventory or Stock Turnover is otherwise called as stock velocity. It indicates whether the inventory has been used effective or not. The very purpose of calculating stock turnover ratio is knowing the extend of funds locked up in inventory.

In other words, Stock Turnover Ratio indicates the number of times the stock has been turned over during the period and evaluates the efficiency with which a firm is able to manage its inventory. The following formulae are used to calculate the Stock Turnover Ratio.

Inventory / Stock Turnover Ratio (Or) Stock Velocity = Cost of Goods Sold / Average Inventory at Cost


Inventory / Stock Turnover Ratio (Or) Stock Velocity = Net Sales / Average Inventory at Cost


Inventory / Stock Turnover Ratio (Or) Stock Velocity = Cost of Sales / Average Inventory


Inventory / Stock Turnover Ratio (Or) Stock Velocity = Net Sales / Average Inventory at Selling Price


Inventory / Stock Turnover Ratio (Or) Stock Velocity = Net Sales / Inventory


Inventory / Stock Turnover Ratio (Or) Stock Velocity = (Average Stock x 365/12) / Cost of Sales

NOTE: If stock velocity is to be computed in period (days / months) than the last formula is used.

Average Inventory = (Opening Stock + Closing Stock) / 2

Inventory Conversion Period

It is otherwise called as Average Age of Inventory. An analyst can find the average time taken for clearing the stocks. In this case, the following formula can be used to find the inventory conversion period.

Inventory Conversion Period (or) Average Age of Inventory = No. of days in a year / Inventory or Stock Turnover Ratio or Stock Velocity

Cost of Goods sold is otherwise called as cost of sales. The main requirements to calculate Inventory / Stock Turnover Ratio are cost of goods sold and average inventory. The cost of Goods sold may be calculated as under.

a. In case of Trading Concern

Cost of Goods Sold = (Opening Stock + Purchase of Raw materials + Direct Expenses) — Closing Stock

b. In case of Manufacturing Concern

Cost of Goods Sold = (Total cost+ Opening Stock Finished Goods) – Closing Stock of Finished Goods.

Total Cost = Raw Materials Consumed + Labour + Overheads

c. If Gross Profit is known

Cost of Goods Sold = Sales – Gross Profit

Generally, the term stock or inventory refers to stock of raw materials, stock of working progress and stock of finished goods.

Average inventory or stock may be calculated as under.

i. If a company is trading or manufacturing seasonal products

= Value of Stock at the end of each month / 12 months

ii. All other business concern

= Opening Stock + Closing Stock

If average stock cannot be ascertained due to non-availability of required information, closing stock may be treated as average stock.

If a company is engaging manufacturing activities, three more ratios are calculated in addition to Inventory/Stock Turnover Ratio. They are Raw Materials Turnover Ratio, Work in Progress Turnover Ratio and Finished Goods Turnover Ratio.

Raw Materials Turnover Ratio = Raw Materials Consumed / Average Stock of Raw Materials

Work in Progress Turnover Ratio = Cost of Completed Work /Average Work in Progress

Finished Goods Turnover Ratio = Cost of Goods Sold /Average Stock of Finished Goods

Significance of Inventory / Stock Turnover Ratio

This ratio indicates the degree of effective management of inventory. It means that high stock turnover ratio shows effective management of inventory and vice versa. Only high stock turnover ratio yields more profits. But, this is not true in all cases.

Sometimes, a company has high stock turnover ratio. This is possible due to keeping of low level of inventory in relation to demand or following conservative method of valuing inventories at lower values or the policy of the company of buying inventory in small lots frequently.

In this situation, high profits cannot be earned by the company. Hence, there is a need of further investigation before interpreting the stock turnover ratio to get final results. Besides, there is no rules of thumb or standard inventory turnover ratio.

Reasons for Low Inventory / Stock Turnover Ratio

1. There is over investment in stock.

2. Closing stock is increased just to take the advantage of expected rise in selling price or to meet the estimated rise in future sales.

3. The stock has been valued incorrectly.

4. There is slump in the business.

Impact of Low Inventory / Stock Turnover Ratio

1. Profitability is low.

3. Over stocking requires more go down space.

3. Non-availability of space for other business activities.

4. There are chances of obsolescence of stock.

5. Quality of the produce is affected.

6. Weak cash in hand.

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