Short answer. The inventory turnover rate measures the number of times stock is fully renewed (sold, consumed or shipped) over a given period, usually a year. It is calculated by dividing outflows for the period (or the cost of goods sold) by the average stock held over the same period.
A measure of how fast stock moves
The turnover rate answers a simple question: how fast does an item move through the warehouse? A high rate signals stock that turns over quickly, generally associated with a good match between supply and demand, and a lower need for storage space for the same volume sold. A low rate, conversely, signals stock that moves slowly, which ties up cash, occupies space and increases the risk of obsolescence, particularly for products with a limited shelf life.
The most common formula is: turnover rate = outflows (or cost of goods sold) for the period ÷ average stock over the same period. The result is interpreted differently depending on the sector: a fresh-produce distributor will aim for a very high turnover rate, whereas a spare-parts manufacturer may deliberately keep a low turnover rate on certain strategic references. There is therefore no universal “good” rate: the relevant benchmark is the company's own history and its sector's standards.
The turnover rate is the exact conceptual inverse of stock cover, which expresses the same phenomenon in days of consumption rather than in number of cycles per period.
FAQ
How do you calculate inventory turnover rate?
The most common formula is: outflows (or cost of goods sold) for the period, divided by the average stock held over the same period. The result expresses the number of times stock is renewed, usually on an annual basis.
What is a good turnover rate?
There is no universal threshold: a good turnover rate depends on the sector, the type of product and the company's strategy. A perishable-goods distributor will aim for a high rate, while a stock of strategic spare parts may deliberately turn over more slowly.
Turnover rate versus stock cover, what's the difference?
These are two ways of measuring the same dynamic. The turnover rate counts the number of times stock is renewed over a period, while stock cover expresses in days how long the current stock can cover consumption at a constant pace.
Related terms
Stock cover · Safety stock · Cycle counting · Occupancy rate · FIFO / LIFO / FEFO · SKU.
See also: automating a warehouse without construction work, ROI of an autonomous pallet truck.
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