Inventory Turnover Ratio: How to Calculate and Improve It

Inventory turnover is the number of times you sell through your entire inventory and replace it within a period (usually a year). The higher the ratio, the faster your inventory moves, and the less cash sits idle on your shelves.

The metric combines the sales lens and the inventory lens in a single number. That reveals what sales figures alone hide: are you selling efficiently, or piling up slow-moving goods that eat your cash and your floor space?

The calculation takes two steps:

• Average inventory = (opening inventory + closing inventory) ÷ 2.

• Turnover ratio = cost of goods sold ÷ average inventory.

What matters is using cost of goods sold in the numerator, not sales at the selling price, because inventory is valued at cost as well. That keeps the comparison consistent. Mixing the selling price with cost inflates the ratio and gives you a false picture.

Take a store with cost of goods sold of SAR 1,200,000 for the year, opening inventory of 180,000 and closing inventory of 220,000:

• Average inventory = (180,000 + 220,000) ÷ 2 = SAR 200,000.

• Turnover ratio = 1,200,000 ÷ 200,000 = 6 times a year.

In other words, the store sells through its entire inventory and replaces it six times a year — roughly once every two months.

Average days on hand translates the turnover ratio into days anyone can grasp:

• Days on hand = 365 ÷ turnover ratio.

In our example: 365 ÷ 6 ≈ 61 days. Each item sits in the warehouse for about two months before it sells. The fewer the days, the faster your cash is freed up and the lower the risk of obsolescence and spoilage. This metric is also easier to explain to your team than a bare turnover figure.

There is no single ideal number — it varies by sector:

• Fresh food and restaurants: very high turnover (dozens of times) because the product is perishable.

• General retail and apparel: moderate turnover (4–8 times).

• Durable goods and spare parts: naturally low turnover.

What matters most is comparing your ratio against your sector average and against your own history. A downward trend across quarters is a warning sign regardless of the absolute number.

Slow inventory is not just a line on a statement — it is frozen cash:

• Capital locked up that could have been working in fast-selling goods.

• Storage and insurance costs, plus the risk of spoilage and obsolescence.

• The risk of forced markdowns to clear slow-moving items at a loss.

Low turnover alongside a healthy book profit is a common cause of liquidity crises: the profit is there, but it is stuck on the shelves instead of in the bank account.

To lift your turnover ratio without emptying your shelves:

• Analyse with the Pareto rule: concentrate your capital on the items that drive most of your sales.

• Identify the slow-moving items and clear them with targeted offers before they become obsolete.

• Set a reorder point for each item instead of buying on instinct.

• Shorten the supply cycle by negotiating smaller, more frequent deliveries.

• Review the ratio monthly for each item, not for inventory as a single block.

Snad links sales movement to inventory, so it calculates the turnover ratio and days on hand for every item and every branch automatically from your actual data.

It highlights your slow-moving items and your fastest movers, and reminds you of the reorder point before you run out. Instead of guessing what is moving and what is sitting, you decide on live numbers that free up your trapped cash and keep your best sellers in stock.