Google Ads Quality Score Explained: How to Improve It and Lower Your CPC
Google Ads Quality Score determines your ad rank and what you pay per click. A score of 7–10 can lower your CPC by 50% or more. Here's exactly how it's calculated and how to improve it.
Quality Score is the most misunderstood lever in Google Ads — and the most expensive one to ignore.
Advertisers with a Quality Score of 3 or below pay up to four times more per click than advertisers with a score of 9 or 10 for the exact same keyword and the same ad position. That is not a marginal difference. On a $5,000 monthly ad budget, a poor Quality Score can mean spending the equivalent of $15,000–$20,000 in wasted CPC premiums every single month.
The flip side: advertisers who consistently achieve Quality Scores of 7–10 can secure top ad positions while paying 30–50% less per click than competitors with inferior scores. Google deliberately built this dynamic into the auction system to incentivize relevance. When your ad is highly relevant to what the searcher typed and your landing page delivers what the ad promises, Google rewards you with lower costs and better placement.
Understanding exactly how Quality Score is calculated — and the seven specific levers that control it — is one of the highest-leverage investments any Google Ads advertiser can make.
What Is Quality Score?
Quality Score is Google's rating of the overall quality and relevance of your keywords, ads, and landing pages on a scale of 1 to 10. A score of 1 means your ad is performing poorly relative to competitors for that keyword; a score of 10 means your ad is among the most relevant and well-structured for that search.
Quality Score is calculated at the keyword level — each keyword in your account has its own score. It is not an account-level or campaign-level metric, though poor keyword-level scores collectively drag down the efficiency of the entire account.
The score itself is a diagnostic indicator, not a direct bidding signal. Google does not use the 1–10 number directly in the auction. What it uses are the three underlying components that comprise the score.
The 3 Components of Quality Score
Quality Score is built from three sub-scores, each rated as "Below Average," "Average," or "Above Average." These three components drive everything.
1. Expected Click-Through Rate (CTR)
Expected CTR is Google's prediction of how likely someone is to click your ad when it shows for a given keyword, relative to other ads competing for the same keyword. This is based on historical data about how your ad — and ads like it — have performed for that search.
Expected CTR is a forward-looking estimate. Google accounts for ad position when calculating it, so a lower position does not automatically penalize your expected CTR score. What matters is whether your ad copy, offer, and call to action are compelling enough to earn clicks.
2. Ad Relevance
Ad relevance measures how closely your ad copy matches the intent behind the search query. When someone searches "emergency plumber Toronto" and your ad headline reads "Trusted Plumbers in the GTA — Book Online Today," the ad is directly relevant. If your headline reads "Home Services Near You," Google considers it a weak match.
Ad relevance penalizes generic, catch-all ad copy. The more tightly your ad mirrors the specific keyword and the searcher's likely intent, the higher this component scores.
3. Landing Page Experience
Landing page experience assesses whether the page a user reaches after clicking your ad is genuinely relevant and useful for what the ad promised. Google evaluates this based on signals including page load speed, mobile usability, content relevance, navigability, and how many users bounce back to the search results immediately after landing.
A landing page that sends every ad click to a generic homepage fails this component even if the ad itself is highly relevant. The chain must be coherent: keyword → ad → landing page must all address the same specific need.
How Quality Score Affects Ad Rank and CPC
Ad Rank — your position in the ad auction — is not determined by your bid alone. It is calculated by multiplying your bid by your Quality Score components (plus additional factors like ad extensions and auction-time context).
The practical consequence:
- An advertiser bidding $5.00 with a Quality Score of 9 can outrank an advertiser bidding $10.00 with a Quality Score of 3.
- Your actual CPC (what you pay) is determined by dividing the Ad Rank of the advertiser below you by your Quality Score, then adding one cent. A higher Quality Score directly reduces the price you pay.
This means Quality Score improvements compound. Every point you add to your score reduces your cost per click, which in turn improves your return on ad spend — without increasing your bid.
The Quality Score Scale: What Each Range Means
1–3 (Poor): Your ad, keyword, or landing page is significantly less relevant than competing ads for this search. Google charges a substantial CPC premium and limits how often your ad appears. This range typically results from keyword themes that are too broad for the ad group, generic ad copy, or landing pages with no direct connection to the keyword.
4–6 (Average): This is where most advertisers live. Your ads are adequate — not irrelevant, but not distinguished. You are paying near-market CPCs and achieving decent but unspectacular impression share.
7–8 (Good): Your ad setup is tighter than most competitors. You receive a modest CPC discount and more consistent ad delivery. This is an achievable target for any well-structured campaign.
9–10 (Excellent): Reserved for ads that are highly specific, tightly matched to a narrow keyword theme, and backed by fast, highly relevant landing pages. Achieving this range requires deliberate structure — small, focused ad groups with closely clustered keywords, tailored headlines, and dedicated landing pages. The CPC discount at this level is substantial: scores of 9–10 can reduce CPC by 30–50% compared to a score of 5.
7 Tactics to Improve Your Quality Score
1. Tighten Ad Group Keyword Themes (1–5 Closely Related Keywords Per Group)
The single most impactful structural change most accounts can make is breaking large, thematically mixed ad groups into smaller, tightly themed ones. An ad group containing "emergency plumber," "burst pipe repair," "plumber Toronto open now," and "hot water heater replacement" cannot be served by one ad that is highly relevant to all four queries. Split these into separate ad groups — one per tight theme — so each group can have a dedicated, precisely matching ad.
The ideal ad group contains 1–5 keywords that are so similar that every keyword can be addressed by essentially the same headline. This structure is called SKAG (Single Keyword Ad Group) at the extreme end, or tightly themed ad groups in the more practical middle ground.
2. Write Ads That Mirror the Keyword
Your primary headline should contain or closely reflect the keyword in the ad group. If someone searches "roofing company Mississauga," an ad with the headline "Roofing Company in Mississauga — Free Estimates" is more relevant to Google (and more compelling to the searcher) than "Trusted Home Improvement Services." Dynamic Keyword Insertion (DKI) can help automate this at scale, though it requires careful implementation to avoid awkward outputs.
Beyond the headline, use the description lines to address the specific intent behind the keyword: the pain point the searcher is experiencing, the specific outcome your offer delivers, and a clear call to action.
3. Use All Relevant Ad Extensions
Ad extensions do not directly factor into Quality Score calculation, but they improve CTR — which does. Sitelinks, callouts, structured snippets, call extensions, and location extensions all expand the visual footprint of your ad and give searchers more reasons to click. More clicks at the same impression volume signals to Google that your ad is meeting searcher expectations, which improves Expected CTR over time.
4. Improve Landing Page Load Speed
Page speed is a direct factor in Landing Page Experience. Google measures how quickly your page loads on mobile devices. A landing page that takes more than 3 seconds to load loses a significant percentage of clicks before the user even sees the content. Use Google's PageSpeed Insights to identify and fix the specific elements slowing your pages — oversized images, render-blocking JavaScript, unoptimized fonts.
5. Match Landing Page Content to the Ad and Keyword
Every keyword-to-ad-to-landing page chain should be coherent. If your ad promises "Free Google Ads Audit for Toronto Businesses," the landing page should have "Free Google Ads Audit" as its headline, explain what the audit covers, and make booking it the primary action on the page. Generic landing pages that mention dozens of services confuse Google's crawlers and confuse the users who land on them — both outcomes hurt Landing Page Experience scores.
Dedicated landing pages for each ad group or campaign theme consistently outperform generic service pages on this metric.
6. Use Negative Keywords to Filter Irrelevant Traffic
Negative keywords prevent your ads from showing for searches that are clearly not your target customer. An upscale restaurant running ads for "private dining Toronto" does not want to appear for "cheap private dining Toronto" or "Toronto restaurants $15 a person." Adding irrelevant queries as negatives keeps your CTR high by ensuring your ad only appears for searches where it is genuinely relevant — which directly improves Expected CTR.
Run a search terms report weekly in the early weeks of any campaign and aggressively add negatives for off-target queries.
7. Monitor and Pause Low-CTR Keywords
Keywords that consistently produce impressions but generate very few clicks drag down your Expected CTR score for the entire ad group. Audit keyword-level CTR monthly. Keywords with very low historical CTR and no conversions after a reasonable test period should be paused or removed — their presence actively hurts the Quality Score of the better-performing keywords sharing the same ad group.
Quality Score Myths
Myth: Quality Score directly affects ads on the Display Network. Quality Score as a 1–10 score is a Search-specific metric. Google Display campaigns use a different ad ranking system and do not apply the same Quality Score calculation. Improving Search Quality Score will not improve Display Network efficiency.
Myth: Quality Score resets to neutral when you make changes. Quality Score is cumulative, based on historical data. Making changes to an ad or landing page does not instantly reset the score to a blank slate. Google continues to factor in historical CTR data while blending in new performance data over time. Expect gradual movement rather than an immediate reset after improvements.
Myth: A higher bid will compensate for a low Quality Score. While a high enough bid can still secure ad placement despite a poor Quality Score, the cost is prohibitive. The CPC penalty for low Quality Scores means bidding your way out of a quality problem is not economically viable at scale. Fixing the underlying relevance issues is always more cost-effective.
If your Google Ads account is burning budget on low Quality Score keywords and underperforming ad groups, a structured account audit is the fastest path to reducing wasted spend. See how SBG manages Google Ads campaigns.
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Search Beyond Google
Search Beyond Google is a digital marketing growth agency helping ambitious businesses in the GTA and across North America build compounding visibility across SEO, Local SEO, AEO, AIEO, Google Ads, and Social Media. Every article is researched and written by the SBG team — practitioners who build and test these strategies daily across real client campaigns.
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