What Quality Score actually measures
Quality Score (1–10) is Google's prediction of how relevant your ad and landing page are to a user searching your keyword. It combines three sub-scores: expected CTR (how likely your ad is to get clicked), ad relevance (how closely your ad matches the keyword), and landing page experience (how useful and relevant your page is to visitors).
Each sub-score is rated below average, average, or above average. A score of 1–4 means at least two of the three components are weak. A score of 7–10 means Google considers your ad genuinely relevant to the searcher.
- Expected CTR: historical and predicted click-through rate for this keyword and match type
- Ad relevance: how closely your ad copy matches the search query and keyword intent
- Landing page experience: page relevance, load speed, mobile usability, and absence of friction
- Quality Score is not used in real-time auction decisions — Ad Rank is. But QS components feed directly into Ad Rank.
Why Quality Score matters for cost
Ad Rank determines your ad position and the price you pay. Ad Rank = bid × Quality Score component × expected impact of extensions. A higher Quality Score means a higher Ad Rank at the same bid — which means a better position at a lower cost per click.
The cost differential is material. Moving from a Quality Score of 5 to 7 on a keyword with a $2.00 CPC typically reduces it to around $1.60–$1.70. Across a campaign spending $5,000/month, that is $300–$400 in saved spend without touching anything else.
The fastest Quality Score improvements
The highest-leverage improvement is usually tightening ad groups. When an ad group contains ten unrelated keywords, the RSA cannot include all of them relevantly. A single-keyword or tight-theme ad group where the main keyword appears in the headline produces much higher expected CTR and ad relevance scores.
For landing page experience, the two most common problems are slow mobile load time and a mismatch between the ad headline and the page headline. If someone clicks an ad for "project management software" and lands on a generic homepage, the landing page experience score drops — and so does Quality Score.
- Add the target keyword in at least two RSA headlines
- Match the landing page H1 to the ad headline keyword
- Ensure the page loads in under 3 seconds on mobile (check with Google PageSpeed)
- Remove navigation links that let visitors leave without converting
- Ask Claude to pull keywords with QS = 5 and diagnose which sub-score is lowest for each
What to do with low-QS keywords
Keywords with QS below 4 and significant spend are costing you in two ways: directly through higher CPC and indirectly by pulling average account quality down. The right action depends on conversion performance: if the keyword converts, improve its ad and landing page alignment. If it does not convert, pause it.
A common mistake is keeping low-QS keywords because they occasionally produce impressions. Impressions from irrelevant traffic have negative expected CTR, which reduces your predicted score further. Pausing the weakest keywords often improves account-wide QS within two weeks.
Using MCP Ads to diagnose QS issues
Connect your Google Ads account and ask Claude: "Pull all keywords with Quality Score below 5 and more than $30 spend in the last 30 days. For each, show which sub-score is below average and the estimated monthly waste from the QS penalty."
Claude can also suggest specific ad copy and landing page improvements based on the keyword theme and current ad content — turning a QS audit into an actionable rewrite list in one conversation.
