What Is Inventory Turnover? The Speed of Stock

Inventory turnover is a ratio that measures how many times a business sells through and replaces its stock in a period, usually a year. The formula in plain text: inventory turnover equals cost of goods sold divided by average inventory for the same period. A turnover of 6 means the brand sold and replaced its average stock holding six times in the year, roughly once every two months.

The definition, properly

Both parts of the formula deserve care. Cost of goods sold, or COGS, is the cost of the units you actually sold, not their selling price. Average inventory is your stock valued at cost, averaged across the period, most simply as opening stock plus closing stock divided by two, or better, as an average of month end values. Using cost on both sides keeps the ratio honest. Dividing revenue or GMV by inventory mixes selling price with cost price and quietly flatters the number.

Turnover has a twin metric, days of cover, which asks the same question from the other side: how many days would current stock last at the current rate of sale. The two convert into each other. A turnover of 6 is roughly 60 days of cover, and a turnover of 12 is roughly 30. Operators tend to plan in days of cover and report in turnover.

How it works

Read the number in both directions.

• High turnover means stock converts to cash quickly. Less money sits on shelves, products stay fresh, and markdowns are rare. Pushed too far, it tips into stockouts, lost sales and lost search rank.
• Low turnover means cash is parked in slow stock. Ageing inventory attracts storage costs, discounting and, in expiry led categories, outright write offs.

What counts as good is category dependent, so treat norms directionally. Groceries and fast moving personal care turn many times a year. Fashion turns with the seasons and pays dearly for missing them. Furniture, large electronics and jewellery turn slower by nature. Compare yourself with your own category and your own past quarters, not with a universal benchmark.

Why it matters for an Indian brand

Working capital in India is expensive, so every extra month of stock is borrowed money earning nothing. The channels make this sharper. Marketplaces charge storage fees that climb as inventory ages in their warehouses, and their algorithms reward listings that sell steadily. Quick commerce is stricter still: dark stores have tiny shelves, so slow SKUs get delisted and purchase orders shrink. In both cases slow turnover does not just cost storage. It costs visibility, and visibility is the growth engine. Turnover is one of the first numbers we pull apart in Consultancy engagements at Zane, because it quietly drives both cash flow and channel performance at the same time.

Common misunderstandings

• Higher is always better. Beyond a point, high turnover means chronic stockouts, which damage marketplace rank and customer retention simultaneously.
• One number is enough. A healthy blended turnover can hide ten fast movers propping up a dead tail. Compute it per SKU and per category.
• Revenue divided by inventory is fine. It is not comparable across margins or over time. Use COGS on top of the fraction.
• Discounts are the fix. Discounting clears symptoms. The causes are usually buying too deep, forecasting on hope and an assortment that grew without pruning.

Turn faster without going out of stock

Set a days of cover band per category rather than a single company wide target. Buy shallower and more often, especially for new SKUs where demand is still a guess. Prune the tail every quarter and let the freed working capital fund depth in proven sellers. Then review turnover monthly alongside the rest of your unit economics, because a brand that turns stock quickly and keeps margin honest funds its own growth without having to beg for it.