Quality Score (Google Ads)
Google Ads' 1-10 diagnostic score for each keyword, based on expected CTR, ad relevance, and landing page experience. Directly affects Ad Rank and CPC.
Definition
Quality Score is Google Ads' 1-to-10 keyword-level diagnostic that estimates how well your ads, keywords, and landing pages serve the user behind a search query. It is calculated from three sub-components — Expected Click-Through Rate, Ad Relevance, and Landing Page Experience — each labeled Below Average, Average, or Above Average. The score is reported in the keywords tab and is recalculated continuously based on historical performance for exact-match impressions on Google.com. The reason Quality Score matters is mechanical: it feeds Ad Rank, which determines whether your ad shows and in what position. The simplified formula is Ad Rank = max bid × Quality Score (plus thresholds, ad asset impact, and contextual signals). Because Ad Rank is divisor and numerator in the CPC calculation, a higher Quality Score lets you win the same auction position at a meaningfully lower cost-per-click — practitioners commonly see a 5-to-10 jump cutting effective CPC by roughly 50%, and a 5-to-3 drop nearly doubling it. Modern practitioners treat Quality Score as a diagnostic rather than a goal. Chasing 10/10 on a broad portfolio is rarely the highest-leverage move; instead, sort by score × impressions to find the highest-spend keywords with sub-7 scores, then improve whichever component is rated Below Average. Note that for Responsive Search Ads, Google also reports a separate "Ad Strength" metric that does not feed Quality Score directly but influences asset selection.
Key Points
- 1Ad Rank = max bid × Quality Score (plus thresholds and contextual signals)
- 2Higher QS = lower CPC for the same auction position
- 3Going from QS 5 to QS 10 can cut CPC by roughly 50%; QS 5 to QS 3 can nearly double it
- 4Expected CTR is weighted heavily — historical CTR vs. position-adjusted benchmark
- 5Ad Relevance measures keyword-to-ad-copy semantic match
- 6Landing Page Experience covers load speed, mobile UX, content match, and transparency
- 7QS 1-2 is a red flag; QS 3-5 needs work; QS 7+ is healthy on commercial terms
- 8QS is a diagnostic, not a KPI — relevant traffic at acceptable CPA is the real goal
Examples
A SaaS advertiser raised QS on their top spend keyword from 4 to 8 by splitting one broad ad group into five tightly themed ones, cutting CPC from $12 to $6.40.
Context
Ad group restructuring is the highest-leverage QS lever because it lifts Ad Relevance and Expected CTR simultaneously — both components improve from the same change.
An e-commerce account had QS 6 with 'Below Average' Landing Page Experience; fixing mobile LCP from 4.8s to 2.1s lifted QS to 9 within two weeks.
Context
Landing Page Experience is often the most ignored component because it sits outside the Ads UI, but Core Web Vitals improvements move it reliably.
Best Practices
- ✓Sort keywords by spend, then filter for QS under 7 to prioritize fixes
- ✓Tighten ad groups: one tight theme per ad group so ad copy can mirror keywords
- ✓Improve Expected CTR by rewriting headlines to include the keyword and a clear value prop
- ✓Improve Ad Relevance by ensuring each RSA has the keyword in at least 2 headlines
- ✓Improve Landing Page Experience with sub-3-second LCP, mobile parity, and message match between ad and hero
- ✓Pause keywords with persistent QS 1-3 and high spend — they are subsidizing the auction for competitors
- ✓Do not chase QS 10 on every keyword — diminishing returns above 7 on most commercial terms
- ✓Treat Ad Strength (for RSAs) and Quality Score as separate signals; both matter but independently
Frequently asked questions
Common questions about Quality Score (Google Ads), answered.
