What is Inventory Turnover?

Why It Matters

This ratio is one of the clearest signals of how efficiently cash is moving through a retail or DTC business, since every dollar sitting in unsold inventory is a dollar unavailable for new stock, marketing, or anything else. A turnover ratio that declines even while sales hold steady is an early warning that the company is quietly overbuying relative to demand, tying up working capital before it shows up as a cash flow problem. It also connects directly to storage costs and markdown risk, since slower-moving inventory sits longer, ages, and often eventually has to be discounted to clear. Comparing turnover across product lines helps identify which SKUs are actually earning their shelf space versus which are dragging down overall efficiency. Ignoring it risks a business that looks profitable on paper while slowly running out of the cash it needs to keep operating.

Example

A retailer has $600,000 in cost of goods sold for the year and an average inventory value of $100,000 held on hand. Inventory turnover is $600,000 divided by $100,000, which equals 6, meaning inventory cycles through roughly every two months on average. A turnover ratio that drops from 6 to 3 year over year, even with sales holding steady, usually means the company is carrying more stock than it needs, tying up cash that could otherwise fund new inventory or marketing.

Frequently Asked Questions

• What counts as 'inventory' in the calculation?

  The average value of unsold stock on hand during the period, typically averaged between the beginning and ending inventory value rather than a single point-in-time snapshot, which smooths out timing distortions.

• How is inventory turnover different from sell-through rate?

  Inventory turnover measures how many times inventory cycles over a full period using cost of goods sold. Sell-through rate measures the percentage of a specific batch of stock sold within a given window, a more granular, per-product view.

• What's a good inventory turnover ratio?

  It varies significantly by industry and product type, fast-moving consumer goods typically turn over much faster than durable or seasonal goods, so the more useful benchmark is usually a company's own historical trend rather than a universal number.

• What causes inventory turnover to drop?

  Overbuying relative to actual demand, slowing sales, poor demand forecasting, or holding onto underperforming SKUs instead of clearing them are the most common causes.

• How can a business improve inventory turnover?

  By tightening demand forecasting to buy closer to what will actually sell, running markdowns or promotions to clear slow-moving stock, and discontinuing chronically underperforming products rather than continuing to restock them.