Stock Days Calculator

About this calculator

Days of stock cover = how long today's inventory lasts at current sales velocity.

What the Stock Days Calculator measures

The Stock Days Calculator gives you an instant, defensible answer for stock days calculator. Operational KPIs determine whether your stock works for you or against you. Tight metrics free up cash, cut waste, and improve on-shelf availability. Use the result alongside the rest of your retail scorecard so trade-offs between sales, margin, stock, and labour stay visible.

How to use the result

Track this metric weekly at department level and monthly at store level. Compare to last year, to budget, and to peer stores. A single number in isolation rarely tells the full story — context (season, weather, promotions, competitor activity) matters. Pair this calculator with the Department Scorecard Generator to roll multiple KPIs into a single rating.

Supermarket and convenience examples

In grocery, this calculation is typically run on departments such as Produce, Bakery, Meat, Deli, Dairy, Grocery, Frozen, Beers Wines & Spirits, and Non-Food. Fresh departments need tighter targets than ambient because of waste and shrink exposure. Convenience formats with high labour-to-sales ratios use the same formula but with category-specific benchmarks.