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Frequency
Frequency indicates how many times, on average, an ad was shown to a single user during a campaign or a given period.
The metric complements reach and helps you understand how often the audience encountered the ad – that is, whether the message was delivered once or repeatedly.
alternative names
- frequency
- average impressions per user
units
- Count
Additions, clarifications, extended definition
The optimal frequency varies by media type, campaign length, objective and the nature of the message. It tends to be higher for brand campaigns than for performance campaigns, while remarketing or TV spots usually see the highest frequencies.
In practice, frequency is tracked alongside reach, as these two metrics form the fundamental pair of media evaluation.
Interpretation
Low frequency may mean most of the audience saw the ad only once and the message may not have had sufficient effect.
Conversely, excessively high frequency can lead to audience fatigue (so-called ad fatigue) – the ad becomes intrusive – and both its effectiveness and perceived value decline.
Watch out: limits and risks of distortion
- Frequency is always an average – it does not show the distribution across the population. Part of the audience may see the ad only once, while another part may see it ten times.
- In the online environment it is measured using cookies or user IDs, so it is not 100% accurate – the same person may be counted multiple times if they use several devices or accounts.
- When combining different media (e.g. online + TV), you need to work with modelled frequency that accounts for overlaps.
- Excessively high frequency increases costs but may no longer improve results – on the contrary, it can reduce engagement and negatively affect brand perception.
Where and how to measure
- Frequency is readily available in the tools of individual ad platforms, such as Google Ads, Meta Ads Manager, etc. Each system calculates it automatically as the ratio of impressions to unique users.
- In TV or radio, frequency is part of the GRP calculation (e.g. reach 30% × frequency 3 = 90 GRPs).
- In online campaigns it is worth tracking not only the overall average frequency but also its distribution across audience segments – e.g. what percentage of users saw the ad 1×, 2–4×, 5× or more. This helps optimise budget and prevent over-delivering the campaign to a narrow group of users.
Formulas
frequency = impressions / reach
Example from practice
An e-shop ran a two-week banner and video campaign across the Google Ads network and YouTube. The campaign reached 320,000 unique users and generated 1.28 million impressions. The average frequency was therefore 4.0 impressions per user, in line with the planned media objective.
A detailed analysis showed that 68% of users saw the ad 2-5 times, while only 7% saw it more than 10 times. Beyond a frequency of 6, both click-through rate (CTR) and video interaction dropped significantly. Based on this data, the agency adjusted the campaign settings and capped delivery to users who had already seen the ad more than 7 times. This reduced wasted spend and increased campaign efficiency by 18%.
