Direct answer. Stock coverage expresses the number of days (or weeks) for which currently available stock can cover average consumption or sales, at a steady pace, before running out. It is calculated by dividing available stock by average daily (or weekly) consumption.
Anticipating stockouts rather than observing them
Where the turnover rate counts the number of stock renewal cycles over a period, stock coverage translates the same information into a duration: "how many days will I last with the stock I currently have on hand, if nothing changes?" This reading in days is often more meaningful to operations teams and buyers, because it compares directly with the supplier's replenishment lead time: if stock coverage drops below the delivery lead time, the risk of a stockout rises sharply, barring an emergency restock.
The basic formula is: stock coverage (in days) = available stock ÷ average daily consumption. The result varies widely depending on the nature of the product: a fast-moving item may have only a few days of coverage by design, with frequent restocks, while a strategic item or one sourced from a distant supplier may justify several weeks of coverage to secure business continuity. As with the turnover rate, there is no universal target coverage: it is managed based on supplier lead time, demand variability and the cost of holding stock.
FAQ
How do you calculate stock coverage?
Stock coverage is calculated by dividing available stock by average daily (or weekly) consumption. The result is expressed as a number of days (or weeks) during which current stock can cover demand, at a steady pace.
What stock coverage should you aim for?
There is no universal target value: the coverage to aim for depends on the supplier's replenishment lead time, demand variability and the cost of holding the product in stock. A reference sourced from a distant supplier generally justifies longer coverage than one with fast replenishment.
Stock coverage vs. inventory turnover rate: what's the difference?
Both indicators measure the same phenomenon from two different angles. Turnover rate counts the number of times stock is renewed over a period, while stock coverage expresses in days how long current stock will last at a steady rate of consumption.
Related terms
Turnover rate · Safety stock · Cycle counting · Occupancy rate · DLC / DDM · FIFO / LIFO / FEFO.
See also: automating a warehouse without construction work, ROI of a robotic pallet truck.
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