Quality Score
A rating on a 1-10 scale used by Google Ads to measure the relevance and quality of your keywords, ads, and landing pages. It is composed of three components: expected click-through rate, ad relevance, and landing page experience, each rated above average, average, or below average. Quality Score is calculated at the keyword level and updated dynamically as performance data accumulates. While other platforms like Microsoft Ads use similar quality metrics, Google's Quality Score is the most widely referenced. A score of 7 or above is generally considered good, while scores below 5 indicate significant optimization opportunities.
Why It Matters
Quality Score directly impacts how much you pay per click and where your ads appear through the Ad Rank formula, which multiplies your bid by your Quality Score. Advertisers with high Quality Scores can outrank competitors who bid higher by providing more relevant experiences. The cost savings are substantial: moving from a Quality Score of 5 to 8 can reduce CPC by 30-50%, effectively multiplying your budget. Quality Score also acts as a diagnostic tool, identifying whether poor performance stems from weak ad copy, irrelevant keywords, or a subpar landing page experience. Monitoring Quality Score trends across your account helps prioritize optimization efforts for maximum ROI impact.
Example
Two advertisers bid on 'running shoes.' Advertiser A bids $3 with a Quality Score of 8 and pays $2.10 per click at position 1. Advertiser B bids $4 with a Quality Score of 4 and pays $3.80 at position 2 despite bidding 33% higher. Advertiser A then audits keywords with Quality Scores below 6 and finds that landing page experience is the weakest component. After creating dedicated landing pages matching each ad group's intent and improving page speed from 4.2 to 1.8 seconds, the average Quality Score increases from 6.2 to 7.8 across the account, reducing overall CPC by 28% and saving $4,200 per month.
Related Terms
Ad Relevance
A measure of how closely an ad matches the intent behind a user's search query or browsing context. Ad relevance is one of the three components of Google Ads Quality Score and is assessed by comparing the language and intent of your keywords to the messaging in your ad copy. Platforms evaluate relevance at the keyword-to-ad level, meaning a single ad group with tightly themed keywords will score higher than a broad group covering unrelated topics. Beyond search, ad relevance also applies to social and display campaigns where platforms score how well creative content matches the interests and behaviors of the targeted audience.
Impression Share
The percentage of total available impressions that your ads actually received in a given time period. Google Ads breaks this into two sub-metrics: impression share lost to budget (your budget ran out before all eligible auctions completed) and impression share lost to rank (your Ad Rank was too low to compete). Impression share is reported at the campaign, ad group, and keyword level. A 100% impression share means your ads appeared for every eligible search. For branded keywords, top advertisers typically target 90-95% impression share, while non-branded campaigns often operate at 40-70%.