Metrics & KPIs

Ad Relevance vs Expected CTR: Message Fit or Click Forecast

In short: Both are Quality Score components graded on the same three-point scale, but they measure different halves of the same keyword's story. Ad Relevance judges whether your ad's message matches the intent behind the keyword, relative to competitors bidding the same term. Expected CTR judges whether people are actually likely to click that ad, based on historical behavior with position stripped out. If the ad reads off-topic for the keyword, look at Ad Relevance; if the message is on-topic but still isn't earning clicks, look at Expected CTR.

By the AdFlint research team · Fact-checked against current Google and Meta platform behavior · Last reviewed July 2026

Ad Relevance

A Quality Score component rating how closely your ad's message matches the intent behind the keyword, graded Below average, Average, or Above average.

It is a relative grade against other advertisers bidding on that keyword, not an absolute verdict on your copy. Below average usually signals an ad group that has drifted to cover too many unrelated themes, so the fix is splitting the group rather than rewriting the ad. The common misreading is assuming the answer is stuffing the keyword into headlines.

Full definition

Expected CTR

A Quality Score component estimating how likely your ad is to be clicked for a keyword, normalized for position and format on a three-point scale.

It is a forecast built from your historical click behavior on that keyword, deliberately stripped of position effects so ranking highly does not flatter it. Being history-based, it moves slowly and resists quick fixes. The common misreading is confusing it with your reported CTR, which still carries the position, competition, and format advantages this component explicitly removes.

Full definition

Side by side.

The differences that actually change what happens in your account.

	Ad Relevance	Expected CTR
What it judges	Whether your ad's message matches the intent behind the keyword.	Whether people are likely to click your ad for that keyword.
Reference point	Relative to other advertisers' ads on the same keyword.	Relative to your own keyword's historical click behavior, normalized for position.
Rating scale	Below average, Average, or Above average.	Below average, Average, or Above average.
What a low grade usually means	The ad group covers too broad a theme and the ad reads generic for this specific keyword.	The message may be on-topic but isn't compelling enough to earn a click once position is accounted for.
Typical fix	Split the ad group into tighter keyword themes so each ad can speak directly to its keyword.	Test new headlines and offers, since this component tracks whether copy actually pulls clicks.
Can be Above average while the other is Below average	Yes - an ad can match keyword intent perfectly and still not earn clicks.	Yes - an ad can earn clicks without being the most relevant message on the keyword.
How position affects it	Not directly - relevance is about content, not click behavior.	Explicitly normalized out, so a high-position ad isn't credited with clicks it got just from ranking well.
Where the fix happens	Account structure - ad groups and keyword grouping.	Ad copy and offer - the actual words and format tested over time.

What actually separates them.

Ad Relevance is judged by comparing your message content to competitors on the same keyword; Expected CTR is judged by comparing your own historical click behavior against what position alone would predict.

A message can be perfectly on-topic (high Ad Relevance) and still fail to earn clicks (low Expected CTR), because relevance measures content fit while Expected CTR measures actual pulling power.

Fixing Ad Relevance usually means restructuring ad groups so the message can be tighter; fixing Expected CTR means testing different headlines and offers within an already well-targeted ad group.

Ad Relevance can be assessed against competitor copy at any point; Expected CTR needs accumulated impression and click data before it settles into a rating.

Ad Relevance has no built-in adjustment for ranking position; Expected CTR is deliberately stripped of position advantage so it isolates copy performance from where the ad happened to rank.

Which one should you use?

Use Ad Relevance when

You're checking whether an ad group has drifted to cover keywords with genuinely different intent.
You want to know if your message is competitive in content, separate from whether it's earning clicks.
You're deciding whether to split an ad group before writing new copy.
You're diagnosing a Quality Score problem and want to rule out a structural mismatch first.

Use Expected CTR when

Your ad group is already tightly themed and the message reads on-topic, but Quality Score is still low.
You want to know if your copy is compelling, independent of the boost from ranking position.
You're deciding which headlines to test next on a keyword that hasn't moved despite restructuring.
You're trying to separate a structural problem from a pure copywriting problem.

Common questions.

Can Ad Relevance be Above average while Expected CTR is Below average on the same keyword?

Yes, and it's a common combination. It usually means the ad is talking about the right thing but the specific words, offer, or format aren't compelling enough to earn the click, so the fix is copy testing, not restructuring.

Does splitting my ad group fix Expected CTR?

Not by itself. Splitting mainly targets Ad Relevance by letting each ad speak more directly to a narrower keyword theme; Expected CTR only improves once the new, tighter ad actually earns better clicks over time.

Why does Expected CTR stay low even after I rewrote my headlines?

Because it's built on accumulated historical click behavior, not on the current state of your copy, so a recent rewrite needs time and enough new impressions before the rating reflects the change.

Or stop choosing between them.

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