What Are Impressions in OOH? DefinitionDefined.
In OOH, an impression is one likely viewer exposure to an ad, based on measured audience traffic past a venue or screen, not a digital page load.
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Impressions
In out-of-home advertising, an impression is a single likely exposure of the ad to a member of the target audience. Unlike a digital impression — a discrete, logged ad load — an OOH impression is a measured estimate of how many people had a reasonable opportunity to see (OTS) the ad, based on audience traffic past the venue or screen.
OOH impressions are calculated using measured or modeled audience data: how many people pass a location, how many are likely to notice the ad (a "likelihood to see" adjustment), and how long they dwell. Independent measurement organizations such as Geopath establish the methodology and audited numbers the industry relies on. Because the counting method differs from digital, OOH impressions should be compared to digital impressions with care — an OOH impression typically reflects sustained, in-context exposure rather than a fractional-second load.
Related terms: CPM, reach and frequency, dwell time.
Pair it with
Public health
Campaigns for health departments and nonprofits.
Explore public health →Point of care
Waiting rooms, exam rooms and HCP lounges.
Explore point of care →Pharmacies
Counter, shelf and screen, at pickup.
Explore pharmacies →Community centers
Rec centers, gyms and youth sports.
Explore community centers →DOOH
Digital screens across every venue type.
Explore DOOH →