Calculate how quickly your inventory is sold and replaced over a given period.
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Inventory turnover measures how many times total inventory is sold and replaced during a given period, usually a year, and is calculated by dividing the cost of goods sold (COGS) by the average inventory value held during that period. A high turnover rate generally indicates efficient inventory management and strong, active sales, while a low turnover rate may indicate stagnant or slow-moving inventory that ties up capital and incurs unnecessary storage costs without generating proportional sales. The tool also calculates "days of inventory on hand" (365 divided by the turnover rate), a more intuitive practical number showing approximately how many days, on average, a product sits in the warehouse before being sold — a figure that's often easier for non-financial staff to interpret than a raw turnover ratio, and useful for spotting slow-moving stock categories that may need a pricing or purchasing adjustment. What counts as a "good" turnover rate varies substantially by industry — a grocery store selling perishables turns inventory far more often than a furniture retailer selling large, infrequently purchased items, so this metric is most meaningful compared against industry benchmarks or a business's own historical performance rather than a single universal target.
Every unit of unsold inventory sitting in a warehouse represents cash that's been spent but not yet recovered — money tied up rather than generating profit. Inventory turnover measures exactly how efficiently a business converts that invested cash back into sales, and by extension, how much cash is realistically tied up at any given time.
The core calculation divides cost of goods sold by average inventory value over the same period, producing a number that represents how many times inventory was fully cycled through and replaced. A turnover rate of 6 means the entire average inventory was sold and replenished six times during the measured period — twice a quarter, roughly speaking.
The more intuitive companion figure, days of inventory on hand, converts that ratio into an average number of days a product sits in stock before selling — calculated as 365 divided by the turnover rate. A turnover rate of 6 translates to roughly 61 days of inventory on hand, a number that's often easier to reason about practically than an abstract ratio: two months is a meaningfully long time for products to sit unsold, depending on the industry.
What counts as healthy turnover varies enormously by business type. Grocery stores selling perishable goods often turn inventory dozens of times a year out of necessity, while a furniture or jewelry retailer selling expensive, infrequently purchased items might have a turnover rate under 4 and still be operating perfectly normally for that industry. Comparing turnover against industry-specific benchmarks, or against a business's own historical trend, is far more useful than comparing against an arbitrary universal number.
It's also worth noting that turnover isn't a metric to maximize without limit — extremely high turnover can sometimes signal inventory levels kept deliberately or accidentally too thin to reliably meet customer demand, risking stockouts and lost sales that don't show up in the turnover number itself. The practical goal is usually an efficient balance calibrated to the specific business and industry, tracked over time to catch slow-moving categories early rather than chasing the single highest possible ratio.
This varies significantly by industry — grocery stores typically have very high turnover, while luxury goods or heavy equipment sellers have much lower turnover, both being normal for their sector.
It may indicate overstocking, slow-moving products, or weak sales — worth investigating further.
Perishable-goods businesses like grocery stores typically have very high turnover, while businesses selling expensive durable goods like furniture or jewelry naturally have much lower, and equally healthy, turnover.