Days of cover
Also called Days of stock, Weeks of cover
How many days your current stock will last at the rate you are currently selling.
Days of cover is stock on hand divided by average daily sales. It converts a unit count into the only unit that matters for a production decision: time.
Compared against lead time it answers the question directly. If you have forty days of cover and a seventy-day lead time, the run you have not booked yet is already late.
The averaging window is the judgement call. Too short and a single good week panics you into an unnecessary run; too long and a genuine trend is smoothed away until it is too late to react.
NextBatch keeps this straight for you. Cost per unit, tolling tiers, yield and traceability all derive from the same plan you and your co-manufacturer share — so none of it is a number somebody typed twice.
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