Stock Cover
The number of days or weeks that current inventory will last at the existing rate of demand, calculated by dividing stock on hand by average daily or weekly sales.
Stock cover - sometimes called days cover or weeks cover - is an inventory metric that measures how long current stock will last before running out, given the current rate of demand. Unlike safety stock, which defines a minimum buffer level, or reorder point, which triggers a new purchase order, stock cover is a forward-looking measurement of time remaining.
The formula is: Stock Cover (days) = Stock on Hand / Average Daily Sales. A business holding 600 units and selling 30 per day has 20 days of cover. Expressed in weeks: Stock Cover (weeks) = Current Stock / Average Weekly Sales. A distributor holding 200 units of a branded garment and selling 25 per week has 8 weeks of cover.
Why Stock Cover Matters for Operational Planning
Stock cover only becomes actionable when compared against supplier lead time. If cover drops below the time it takes a supplier to deliver a restocking order, a stockout is certain rather than possible. A promotional merchandise distributor holding 10 days of cover on a key garment, with a supplier lead time of 15 days, needs to act immediately - placing an order right now still leaves a five-day gap.
Most businesses set minimum cover targets by product type. Fast-moving lines with reliable demand typically target 20-30 days. Slow-moving or seasonal items are kept at lower levels to avoid tying up cash in stock that will not sell. Products sourced from suppliers with long or variable lead times are held at higher cover to build in a buffer against delivery delays.
Track at SKU Level
A blended cover average across a product category hides problem lines. A product running at 5 days cover inside a category averaging 30 will cause a stockout. Monitor cover at individual SKU level for any product where availability directly affects customer orders.
Stock Cover vs Related Inventory Terms
Stock cover is frequently confused with reorder point and safety stock, but each serves a different purpose. Reorder point is the inventory level at which a new purchase order should be raised - it is a trigger. Safety stock is a permanent minimum buffer held below the reorder point to protect against demand spikes or supplier delays - it is a floor. Stock cover is neither: it is a current measurement of how many days of supply remain, used to assess urgency and inform when to order.
A business monitoring all three has a complete inventory picture. Safety stock defines the minimum to always hold. Reorder point says when to act. Stock cover tells you how much time you have left before you must.
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