Google Ads Quality Score: What It Actually Measures
Quality Score is a diagnostic, not a scoreboard. Here's what its three components measure, why chasing a perfect score can hurt performance, and where the effort is actually worth spending.
"Why is my Google Ads Quality Score only 4 out of 10 when the campaign is profitable?" We get this question most weeks from new clients who've been told by a previous agency, or a very confident YouTube video, that Quality Score is the metric to fix above all others. It isn't. It's a diagnostic, not a scoreboard, and treating it as the latter leads people to make changes that hurt performance while the number goes up.
What Quality Score actually measures
Quality Score is a 1-10 rating Google Ads assigns at the keyword level, meant to show how your ad and landing page compare with other advertisers competing for the same search. Google is explicit about this: it's a diagnostic tool, and it is not an input in the ad auction itself. What does affect the auction is Ad Rank, which is a separate calculation involving your bid, ad and landing page quality, and several contextual factors including device, location and the competitiveness of that specific search at that specific moment.
That distinction matters. You can improve Quality Score without improving Ad Rank, and you can win auctions with a mediocre Quality Score if your bid and assets are strong enough. Chasing the number in isolation is chasing the wrong thing.
The three components, and which one actually moves
Quality Score is built from three sub-metrics, each rated above average, average, or below average against advertisers showing for the same keyword over the past 90 days: expected click-through rate, ad relevance, and landing page experience.
Expected click-through rate is the hardest to shift quickly because it's a prediction based on historical performance for that keyword and ad combination, not something you can edit directly. It responds to better ad copy, tighter ad group themes, and time.
Ad relevance is about how closely your ad text matches the intent behind the search term. This is usually the quickest win: an ad group built around ten loosely related keywords will always score worse here than one built around a tight cluster of three or four, because the ad copy can't speak precisely to all ten at once.
Landing page experience is where most below-average scores actually come from, and it's also the component agencies most often ignore because it isn't a Google Ads setting. If the page a click lands on loads slowly, doesn't match the ad's promise, or buries the thing the searcher was looking for, Google marks it down regardless of how good the ad itself is. We've taken over accounts with well-written ads and tight keyword lists that were still scoring 3 or 4 because the client was sending every click to a generic homepage. Fixing that is a conversion rate optimisation problem before it's a Google Ads problem.
Why a high score isn't the goal
We've had clients ask us to get every keyword to 9 or 10. That request usually comes from a misunderstanding: a keyword sitting at 6 or 7 that is converting well and hitting your target cost per acquisition is already doing its job. Pushing it to 9 or 10 by broadening the ad group or diluting the landing page copy to appeal to more search variants can easily drop the conversion rate while the diagnostic number climbs. The score describes relevance to the average searcher for that term, not profitability for you.
Low Quality Score keywords are worth investigating. They're not worth "fixing" by editing away the specificity that makes them convert.
Where to actually spend the effort
Start with landing page experience, because it's usually the biggest gap and the one most under your control. A dedicated page for the search intent behind a keyword group, not a generic service page, is the single change we see move Quality Score the most consistently across client accounts. This is also the fastest way to lift conversion rate, which matters far more than the score itself.
Once that's sorted, tighten your ad groups, splitting broad themes into smaller, tightly matched groups so ad copy can speak directly to the search term rather than a generalised version of it. Then look at ad copy and assets, making sure headlines and descriptions use the actual language searchers use, not internal company terminology.
This is the pattern we see across the Google Ads accounts we manage and in the case studies we publish: the strongest Quality Scores follow from fixing landing pages and ad relevance, not from tweaking settings inside Google Ads itself.
When to stop looking at it altogether
If a keyword is converting well, hitting your target cost per acquisition, and the account is growing, a below-average Quality Score on that keyword is not a problem that needs solving. Quality Score is a useful early warning system for keywords that are underperforming for reasons you can't otherwise see, particularly landing page mismatches. It is not a target to optimise for its own sake, and any agency reporting on Quality Score improvements as a headline result, without reference to cost per acquisition or conversion rate, is reporting on the wrong metric.
Getting this balance right, knowing which diagnostics to act on and which to ignore, is most of what separates an account that spends efficiently from one that just looks tidy in the dashboard. If you want a second opinion on what your account's Quality Scores are actually telling you, get in touch and we'll take a look.