What Are Gross Contacts in OOH?
Gross Contacts represent the cumulative number of potential advertising exposures across an out-of-home (OOH) campaign. This metric is calculated by multiplying the daily traffic passing a site by the number of days the advertisement is displayed. For example, a poster site with 10,000 daily contacts running for 28 days would generate 280,000 gross contacts.
Why Gross Contacts Matter
Gross Contacts serve as a foundational metric for OOH campaign planning and evaluation in the UK market. They provide media planners with a straightforward way to compare the scale of different sites and locations. This metric helps agencies like Connect Media Group assess the reach potential of campaigns before considering frequency, demographics, or actual engagement.
Gross Contacts are essential for budget allocation decisions. By understanding the gross contact potential of various sites – from London Underground stations to regional motorway billboards – planners can identify which locations offer the best value for campaign objectives.
How It's Calculated
The calculation is simple: Daily Traffic × Campaign Duration (in days) = Gross Contacts
Daily traffic figures come from industry-standard research conducted by organizations like Route, which provides detailed footfall and traffic data for OOH sites across the UK. These figures account for pedestrian counts at street level, vehicle counts on roads, and passenger numbers on public transport.
Important Limitations
While useful, Gross Contacts don't tell the complete story. This metric assumes every person passing a location sees the advertisement, which isn't realistic. It doesn't account for:
- Viewing angles and visibility from different directions
- Dwell time (how long people actually look at the ad)
- Audience composition and whether it matches your target market
- Frequency (how many times the same person is exposed)
- Creative impact and whether people actually notice the ad
When to Use Gross Contacts
Gross Contacts are most valuable during initial campaign scoping and site selection. They're particularly useful for:
- Comparing potential reach across multiple locations
- Justifying budget spend to stakeholders
- Establishing baseline campaign scale
- Benchmarking against industry standards
However, more sophisticated planning combines Gross Contacts with metrics like Target Audience Reach, Frequency, and Visibility Ratings for a comprehensive picture of campaign effectiveness.
UK Market Context
In the UK OOH market, gross contacts remain a standard reporting metric, though the industry increasingly emphasizes data-driven insights. The Outdoor Advertising Association (OAA) and media owner platforms now provide more granular audience data, allowing planners to move beyond volume metrics to understand who is actually being reached.