Ad frequency is the average number of impressions per reached person or account within a defined reporting period. Creative fatigue is a possible decline in response after repeated exposure to an ad. A rising frequency figure alone does not prove fatigue.
Look for changes in response and outcomes, then check other explanations before replacing the creative.
Calculate frequency within one scope
Average frequency = impressions ÷ reach.
If a campaign records 60,000 impressions and reaches 20,000 people within the same report, average frequency is 3.
That does not mean every person saw the ad exactly three times. Some may have seen it once and others much more often. Google’s reach and frequency guide also explains that unique-reach reporting can involve modeled measurement.
Always include the time window. A frequency of 3 in two days means something different from 3 over a month.
Is there a maximum frequency you should use?
There is no universal cutoff that proves an ad has been shown too often. Audience size, campaign duration, purchase cycle, objective, and message all affect the interpretation.
An event reminder reaching a small registered audience has a different job from a prospecting ad introducing a new product. Use a relevant baseline and the available delivery controls for your actual campaign type.
Look for several signals together
Possible fatigue deserves investigation when frequency rises while click response falls and cost per useful action increases under otherwise comparable conditions.
For example, a fictional campaign might move from 2% to 1.2% link CTR while frequency rises over successive equal reporting windows. If CPA also worsens, the combination is more informative than frequency alone.
Do not call this proof. A promotion ending, a changed audience, or a broken checkout could produce a similar pattern.
Check the other causes first
Review:
- Whether the price, offer, or availability changed.
- Whether spend shifted between placements or audiences.
- Whether the landing page still works on mobile.
- Whether tracking or consent behavior changed.
- Whether conversion reporting has had enough time to mature.
Use CTR and conversion rate together to locate the part of the journey that weakened. Stable click response with falling purchase conversion points to a different problem from declining response to the ad itself.
Refresh the message meaningfully
If fatigue remains a plausible explanation, test a new benefit, demonstration, customer question, or opening scene. A minor background-color change may do little when people have already absorbed the main message.
Keep the offer and destination consistent when the purpose is to learn whether the new execution improves response. Record what changed rather than labeling every new file simply “refresh.”
The creative testing framework explains how to separate new concepts from smaller variations.
Decide with an agreed review rule
Choose review intervals that make sense for your delivery volume and conversion delay. Avoid changing everything after one weak day.
Record the frequency window, response trend, outcome trend, likely explanation, and next test. That turns a vague concern about tired ads into a decision the team can revisit.