What it means
Turnover is one of the oldest and most widely used efficiency measures in business, because it converts a balance sheet number into a description of movement. Instead of asking how much stock a company holds, it asks how hard that stock is working.
The measure matters most to cash. Every extra turn releases money that would otherwise be locked in the warehouse, which is why a business that improves turnover from four to five times can often fund growth without touching its overdraft.
Sensible ranges vary enormously by sector. A supermarket may turn its stock more than twenty times a year because much of it is perishable, while a jeweller or a specialist machinery dealer may turn stock once or twice and still be highly profitable.
Turnover is most useful when converted into days, because managers think in weeks and months rather than in multiples. Dividing 365 by the turnover figure gives days inventory outstanding, the average time an item spends in stock before it sells.
The main pitfall is the denominator. Using only the closing stock figure distorts the answer for seasonal businesses, so averaging opening and closing balances, or better still the twelve month-end figures, produces a far more honest result.
Turnover also sits at the heart of the cash conversion cycle, the measure of how long money stays locked in the business between paying suppliers and being paid by customers. Shortening stock days feeds straight through to that cycle, which is why operations improvements often show up in the finance team's cash forecast within a single quarter.
In practice
Real-world examples.
Example
A grocery chain reports turnover of 24 times a year on fresh produce and 6 times on tinned goods. The wide gap is expected, and the buying team sets separate stock targets for each category rather than one blanket rule.
Example
A machine tool dealer turns stock 1.8 times a year. Because each unit carries a gross margin above 40% and takes months to sell, the low turnover is a deliberate part of the business model rather than a failure.
Example
A cosmetics start-up improves turnover from 3.2 to 4.6 times after switching to smaller, more frequent supplier orders. The change releases about $180,000 of cash, which funds a marketing push without new borrowing.
Think of it
“Inventory turnover is like measuring how often a store completely restocks its shelves-faster cycling means fresher products.
Formula
Calculation
Inventory turnover ratio = Cost of goods sold / Average inventory
Average inventory = (Opening inventory + Closing inventory) / 2
A kitchenware wholesaler reports cost of goods sold of $4,800,000 for the year. It opened the year with inventory of $700,000 and closed with $900,000.
Average inventory = ($700,000 + $900,000) / 2 = $800,000.
Inventory turnover = $4,800,000 / $800,000 = 6.0 times.
Converting that to days: 365 / 6.0 = 60.8 days, so stock sits on the shelf for about 61 days on average. If the company trimmed average inventory to $600,000 while holding sales steady, turnover would rise to $4,800,000 / $600,000 = 8.0 times, or about 46 days, freeing $200,000 of cash.Case study
Seen in the real world.
Ashgrove Auto Parts is a fictional distributor used here to illustrate the ratio. It held average inventory of $1,500,000 against cost of goods sold of $6,000,000, giving turnover of 4.0 times, or roughly 91 days of stock.
A line-by-line review found that a fifth of the catalogue accounted for four fifths of sales, while several thousand slow lines had not moved in over a year. Those slow lines represented $520,000 of the average stock holding and were turning less than once a year.
The company cleared the dead ranges at a small loss, moved rarely requested parts to a supplier-direct model and concentrated its own shelves on fast sellers. Turnover reached 5.5 times within a year in this illustrative scenario, cutting stock days from 91 to 66 and releasing roughly $410,000 of cash.
Watch out
Common mistakes.
- Using sales revenue instead of cost of goods sold in the numerator, which inflates the ratio by the gross margin and ruins comparisons with other companies.
- Taking closing inventory as the denominator in a seasonal business, so a post-Christmas count makes turnover look far better than the year actually was.
- Chasing the highest possible turnover, which can cause stockouts, rushed freight costs and lost customers that far outweigh the cash saved.
Questions
People also ask.
What is a good inventory turnover ratio?
It depends entirely on the sector, so the useful comparisons are against the company's own trend and against direct competitors of a similar size.
How does turnover relate to days inventory outstanding?
Days inventory outstanding is simply 365 divided by the turnover figure, expressing the same information in a form managers find easier to act on.
Can turnover be calculated for part of the business?
Yes, and it is usually more useful that way, since separate figures by product category or location reveal problems that a single company-wide number hides.
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