Inventory Turnover: Is the Business Selling Fast or Slow?
Inventory turnover measures how many times a business sells through and restocks in a year. We explain how to calculate it, how to read it by industry, and why it reveals business health.
Goods sitting in the warehouse are cash "asleep"
For a business that sells goods, inventory is cash already spent but not yet recovered. The faster goods sell, the faster cash cycles, and the healthier the business. Inventory turnover measures exactly that speed.
How to calculate it
Inventory turnover = Cost of goods sold (COGS) divided by Average inventory
The result shows how many times in a year the business sells through and restocks. For example, a turnover of 8 means inventory "turns over" 8 times per year, so on average each batch sits in the warehouse about 1.5 months (365 / 8 ≈ 46 days — known as days inventory outstanding).
How to read it
- High turnover: sells fast, little capital trapped in inventory, less risk of obsolescence. But too high can signal under-stocking, risking stockouts and lost sales.
- Low turnover: goods sell slowly, working capital is tied up in inventory, with risk that stock must be discounted or written off.
Always compare by industry
There is no universal "good" number. Turnover depends heavily on industry:
- Supermarkets and fresh food: very high turnover (goods must sell quickly).
- Jewelry, real estate, heavy machinery: normally low turnover.
Comparison is only meaningful between businesses in the same industry, or for the same business across years to see the trend.
Why it reveals business health
- Turnover declining quarter by quarter: an early sign goods are getting harder to sell — weakening demand, obsolete products, or over-stocking. It often appears before revenue and profit margins drop.
- Inventory ballooning faster than revenue: a red flag — the business may be stuffing the distribution channel or misjudging demand.
- Turnover improving: better management, products in demand — a positive signal.
This is one piece when assessing a good or bad business, complementing liquidity measures like the quick ratio.
Conclusion
Inventory turnover measures how many times a business sells through and restocks in a year — the faster goods sell, the more efficiently cash cycles. Read it by industry and across multiple years, never as a raw number. A steadily declining turnover is often an early signal of business trouble.
Next step
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