How To Measure Out Of Home Advertising? A Guide To Impressions, Reach, And More

Running out-of-home advertising is all fun, but one question makes you wonder: How do I know if my campaign is actually working? Out-of-home ads are significantly opposite of digital ads, where clicks and conversions are tracked daily. However, OOH success is measured differently. 

As per research, marketers are increasing ad spend on out-of-home advertising; the industry is establishing consistent measurement standards so campaigns can be planned, analyzed, and evaluated more effectively. 

But let’s get back to the real question: how exactly is OOH campaign measurement done? This guide covers the key metrics you need to understand, including impressions, reach, frequency, CPM, and more, so you can confidently evaluate your campaign’s performance.

What Are You Trying to Achieve with Your OOH Campaign?

Before understanding outdoor advertising measurement, figure out what you are trying to achieve. With every goal come different metrics that could measure the outcomes. The metrics you analyze will change depending on your objective. (For example, a campaign for brand awareness could be measured differently than a campaign designed to drive leads to stores. Now ask yourself what your desired business goals are.

1. Brand Awareness: Track impressions, reach, and frequency to understand how many people saw your campaign.
2. Website Traffic: Measure website visits, landing page traffic, and QR code scans to see how many people engaged online.
3. Store Visits: Track foot traffic to understand how many people visited your location after seeing your ad.
4. Lead Generation: Measure phone calls, contact form submissions, and quote or demo requests to evaluate customer interest.
5. Sales: Track purchases, promo code redemptions, and revenue to measure conversions.
6. App Promotion: Measure app downloads, installs, and new user sign-up numbers to evaluate campaign impact.
7. Event Promotion: Track registrations, ticket sales, and event check-ins to measure attendance.

Key Metrics Used to Measure Out-of-Home Advertising

Impressions

OOH impressions estimate the number of times people were likely to see your out-of-home advertisement. It doesn’t exactly tell how many people saw your ad, only a total number of potential views.

How Are Impressions Measured?

Impressions are measured using traffic data, mobile location data, and audience measurement technology. These tools help estimate the number of people passed by the ad and then apply visibility data to calculate how many were likely to notice the advertisement. 

Reach

Reach is the estimated number of unique people who saw your OOH campaign. It may sound the same as impressions, but reach counts each person only once even if they passed by the ad multiple times.

How Is Reach Measured?

Reach is measured through anonymous mobile location data, travel patterns, and audience measurement models. All these tools estimate how many unique people passed through the ad and remove duplicate exposures.

Frequency

Frequency measures the average number of times a person sees your advertisement during a campaign. While reach tells you how many unique people your campaign reached, frequency shows how often those people were exposed to your message.

How Is Frequency Measured?

To calculate frequency, you need impressions and reach numbers. It is calculated by dividing the total number of impressions by the campaign’s reach. If you get a higher frequency, it means people are seeing your advertisements more often.

Remember, Frequency = Total Impressions ÷ Reach

CPM

Cpm aka cost per thousand impressions. It simply explains how much you pay to get 1,00 estimated impressions. In simpler words, it helps you understand how cost-effective your OOH campaign is at reaching people.

Advertisers often use CPM as a part of  OOH measurement to compare the cost of different billboards. For example, if two billboards generate the same number of impressions, but one with a lower CPM delivers more impressions for the same budget.

How Is CPM Measured?

CPM is calculated using the campaign cost and the total number of generated impressions. By dividing the total campaign cost by the number of impressions (in thousands), advertisers can determine the average cost of reaching 1,000 potential viewers.

Remember, CPM = (Campaign Cost ÷ Total Impressions) × 1,000

For example, if your campaign costs $5,000 and generates 500,000 impressions, your CPM would be $10.

Website Traffic

Website traffic measures how many people visited your site after seeing your OOH campaign. As mentioned previously, OOH ads don’t generate clicks like digital ads, but they can still encourage people to search your brand and visit your website.

How Is Website Traffic Measured?

To measure website traffic, advertisers use different tools like web analytics and Google Console. Then they compare the traffic before, during, and after the campaign to identify any uplift in visits. Another best way is to create unique landing pages, UTM-tagged links, or QR codes for OOH ads. It would help you estimate how much website traffic was driven by the campaign. 

Foot Traffic

Foot traffic measures the number of people physically visiting your store, restaurant, or business location after seeing the ad. This metric helps advertisers understand whether the advertisement encouraged people to visit the mentioned brand location.

How Is Foot Traffic Measured?

Foot traffic is measured using anonymous mobile location data. This data shows whether people who were near an OOH advertisement later visited the advertised store or business. By comparing store visits before, during, and after the campaign, advertisers can estimate whether the campaign helped increase foot traffic. 

Summary

At the end of the day, measuring OOH campaigns is not just about adding the number to the report. All of the effort ends with one simple question: Was the investment worth it? Every metric, whether it’s impressions, foot traffic, website visits, or CPM, gives you a new angle of measurement. However, when you combine them, it clearly evaluates performance and your OOH advertising ROI.

Understanding the key metrics is just the start of the journey. Equally important is choosing the right advertising partner, one that launches your campaign and also helps you measure its success. If you’re still comparing options, check out our guide to finding the best outdoor advertisement provider before launching your next campaign. 

That is where Boxi stands out. Traditional billboards do provide measurement details, but Boxi takes a step further. They provide truck advertising billboards that you can track and measure. 

Every campaign includes a 24/7 live dashboard where you can track your trucks’ routes, miles covered, estimated impressions, and key campaign metrics in real time. So stop waiting until the campaign ends to understand its performance. Partner with Boxi, which gives wheels to your brand, and see where and how it’s performing.