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Inventory turnover measures how many times a business sells and replaces its average inventory during a period. It is calculated by dividing COGS by average inventory. Four turns means your stock cycled four times. For Shopify and DTC brands, turnover shows how much working capital is tied up in stock and how quickly it comes back.
What is Inventory Turnover?
Stock is cash in a different shape. Until it sells, that money cannot pay for ads, staff or the next order.
Turnover shows how fast the cash comes back. A high number generally means stock is moving quickly. A low number can mean more working capital is sitting in inventory than the business needs.
It tends to surface problems like:
- Ordering ahead of demand and holding the excess for months
- One category dragging while the rest of the catalogue moves fine
- A warehouse full of stock nobody has looked at since last season
- Cash shortages in a business that looks profitable on paper
Most teams read it alongside sell-through rate, days inventory outstanding, stockout rate and margin.
Inventory Turnover Formula
- Inventory Turnover = COGS ÷ Average Inventory (Average Inventory = (opening stock + closing stock) ÷ 2)
If your cost of goods sold last year was $900,000 and you held $180,000 of stock on average:
- $900,000 ÷ $180,000 = 5 turns
Both sides should be measured at cost. Mixing COGS with retail inventory value distorts the result. Divide 365 by your turnover to estimate days of inventory on hand. At 5 turns, that is roughly 73 days. You can break it out by month, quarter, category, supplier or location.
Why is Inventory Turnover Important?
The same money does very different amounts of work depending on how fast it moves. Hold $180,000 in average inventory and the gap is stark:
- 2 turns = $360,000 of goods moved
- 5 turns = $900,000 of goods moved
Same cash on the shelf, two very different businesses. Slow turns also cost you in ways that never appear as a line item: storage, insurance, stock going out of season, and the discount you eventually take to clear it. Faster is not automatically better: turnover also rises when you hold too little and lose sales to stockouts.
The decision this metric should drive is purchasing, how much to order, and how often.
SMB/DTC Benchmark
As a practical planning range, 4-6 turns a year can be a useful reference point for general retail and eCommerce, but there is no universal Shopify or DTC benchmark.
- General retail and eCommerce — 4-6 turns
- Perishable and fast-moving lines — 10-12 or higher
- High-ticket goods like furniture or jewellery — 2-3, and healthy there
Treat these as practical planning ranges rather than universal targets. They reflect common retail planning practice, not a single published study. Supplier minimums and lead times drive turnover as much as demand does, so compare month over month, by category, by supplier, and against gross margin before comparing yourself to anyone else.
How Can Inventory Analytics Help Improve Inventory Turnover?
The hard part is rarely the maths. It is that stock levels, COGS and sales all live in separate systems, so the number arrives late and nobody trusts it enough to act on.
Inventory analytics puts turnover alongside stock on hand, COGS, sell through and channel revenue, making it easier to spot slow moving stock before it becomes excess inventory.
DataAnalyticsStack runs this as a managed service. It is not a tool you have to set up yourself or a one off consulting project.
