Penetration rate answers a simple question: out of everyone who came into the store, how many reached this zone? It is calculated as the trips that visited a zone, category, bay or display divided by all store trips in the same period.
It is the first step of every conversion funnel and the base for pricing in-store media: its media version, opportunity to see, is the share of store trips that pass a placement's visibility area. It is also one of the metrics of the end caps performance report and of the aisle-by-aisle view in aisles direction.
What is penetration rate? Meaning in retail
Penetration rate means the share of a group that has done something, and in retail it is used in two senses. In store analytics, penetration rate is the share of all store trips that reach a given zone, category, bay or display in a period: if one trip in five passes the coffee aisle, the coffee aisle has a 20% penetration rate. In marketing, market penetration rate is the share of a target market that buys a product or brand. Both measure reach, but at different levels: the store floor versus the whole market. Shopper penetration inside the store matters because low penetration is a reach problem, not a shelf problem. If few trips get to a category, no planogram change will fix its sales. That is why penetration rate is the first step of the shelf conversion funnel.