In this article
Google Ads Quality Score is a 1–10 per-keyword diagnostic that directly shapes how much you pay at auction. When it drops, your CPA climbs even if your bids stay constant. This guide explains exactly how Quality Score works in 2026, what has changed with Smart Bidding and Performance Max, and the practical levers that bring CPA back down without touching your budget.
Contents
What is Google Ads Quality Score?
How Quality Score determines what you pay
What determines your Quality Score?
Quality Score and Smart Bidding in 2026
Performance Max and asset quality ratings
Practical steps to raise your Quality Score
When does it make sense to bring in a specialist?
Frequently asked questions
A marketing manager at a growth-stage retail brand watches her Google Ads CPA climb from $45 to $80 over six months. Despite holding bids constant, adding negative keywords, tightening audiences, and refreshing ad copy, the CPA keeps drifting up.
Quality Score explains most of this story. When the underlying signals that Google uses to judge ad relevance degrade (because a landing page has not been updated, an ad group has become too broad, or CTR has slipped) Google charges more for the same position. The budget is doing less work, not because bids went up, but because Ad Rank went down.
Improving Quality Score is the fastest lever to cut CPA without raising budget, because it directly reduces the effective cost per click at auction. Every dollar saved on CPC compounds into lower CPA and stronger ROAS across the entire account.
What is Google Ads Quality Score?
Google Ads Quality Score is a diagnostic metric, scored 1–10, assigned to each keyword in your account. It reflects how relevant Google judges your keyword, ad, and landing page to be relative to the search query a user typed.
The score is not what Google uses to set your actual auction price in real time. Google calculates a contextual signal at each individual auction that is richer and more granular than the stored 1–10 score. But Quality Score is the best available diagnostic in your account: a low score tells you there is a relevance problem, and the three sub-scores tell you exactly where it lives.
Each keyword receives a rating on all three components: Below Average, Average, or Above Average. A keyword at QS 4 with a landing page experience rated Below Average is giving you a clear instruction: fix the landing page.
Google’s prediction of how often your ad will be clicked when shown for this keyword, compared to other ads competing for the same query. This is based on historical CTR data for the keyword, your ad, and the user’s device, not just your own account history.
How closely your ad matches the intent behind the search query. An ad group containing 40 loosely related keywords pointing at a single generic ad will consistently score Below Average here. Tighter, more specific ad groups score higher.
How useful and relevant your landing page is to someone who just clicked your ad. Google evaluates the page’s relevance to the keyword, its loading speed, mobile usability, and whether it delivers on what the ad promised. A landing page that covers women’s running shoes but ranks for generic ‘trainers’ queries will score poorly here.
How Quality Score determines what you pay
Quality Score feeds directly into Ad Rank, the score Google uses at each auction to decide which ads appear and in what position. A higher Quality Score means your ad can achieve a better position at a lower bid than a competitor with a lower score.
Google’s Ad Rank formula (as documented in the Google Ads Help Centre) considers your bid, your quality signals, the expected impact of ad extensions, and auction context including the user’s device, location, and search query. Quality Score is the visible proxy for the quality signals component.
The practical consequence: two advertisers bidding the same amount per click will pay different prices at auction. The advertiser with the higher Quality Score wins a better position and pays less per click to hold it. Google rewards relevance with a lower effective cost, and that saving flows directly into CPA and ROAS.
| Scenario | Quality Score | Max CPC Bid | Ad Rank (simplified) | Likely Outcome |
|---|---|---|---|---|
| Broad ad group, generic landing page | 4 | $3.00 | 12 | Lower position, higher actual CPC to hold rank |
| Tight ad group, matched landing page | 8 | $3.00 | 24 | Higher position, lower actual CPC to hold rank |
| Tight ad group, matched landing page | 8 | $2.00 | 16 | Similar position to QS 4 at $3.00, at one-third less spend |
Ad Rank shown as bid x Quality Score (simplified illustration). Actual Ad Rank also includes extension impact and auction context. Source: Google Ads Help Centre: About Ad Rank.
What determines your Quality Score?
Each of the three Quality Score components has a specific improvement path. Treating them as one undifferentiated problem leads to wasted effort: a low ad relevance score and a low landing page experience score require completely different fixes.
Expected CTR is the component most directly under your control through ad copy. If your expected CTR is rated Below Average, your headlines are not compelling enough relative to competitors bidding on the same query. Test headline variations that include the keyword itself, add a specific number or benefit, and use pinned headlines strategically in Responsive Search Ads to control what Google assembles. Ad extensions (sitelinks, callouts, structured snippets) also influence perceived relevance and click propensity. A well-structured extension set raises the quality of the full ad unit.
Ad Relevance is almost always an ad group structure problem. When one ad group contains 30 keywords spanning a broad theme, the single responsive search ad cannot be specific enough to match all of them well. The fix is tighter Single Theme Ad Groups (STAGs): group keywords by the single intent they share, write ads that speak directly to that intent, and keep each group narrow enough that the ad copy feels written for that specific query. One ad group per product sub-category, not one ad group for the entire category.
Landing Page Experience is frequently the most impactful component to fix and the most neglected. Google assesses relevance between the page and the keyword, but also the experience: loading speed, mobile usability, navigability, and transparency. A common failure mode: an ad for “women’s waterproof hiking boots” lands on the general footwear category page. The user sees 80 products, the keyword appears nowhere in the headline, and half the page is invisible on mobile. The fix is keyword-specific landing pages, or at minimum ensuring the ad’s destination URL takes the user to the most relevant page on the site, with content that explicitly matches what the ad promised.
Quality Score and Smart Bidding in 2026
Smart Bidding strategies (Target CPA, Target ROAS, Maximise Conversions) do not use the stored 1–10 Quality Score to set bids. But they use the same underlying signals, evaluated in real time at every auction. Quality Score remains the clearest diagnostic available for understanding where those signals are weak.
WHY QUALITY SCORE STILL MATTERS IN SMART BIDDING
When a Smart Bidding strategy is underperforming (CPA exceeding target, ROAS falling short) the most common account-level cause is degraded quality signals: poor ad relevance, a slow landing page, or a mismatch between ad copy and destination. Smart Bidding cannot fix those. It can only set bids within the quality environment you have built. A keyword sitting at QS 4 with a Smart Bidding strategy applied is paying a relevance penalty at every auction, and the algorithm has no lever to offset it. Fix the Quality Score signals first; let Smart Bidding optimise within a cleaner signal environment.
One practical shift in 2026: Google’s automated bidding has become more capable at identifying high-intent moments, but it still relies on the advertiser to maintain the relevance architecture of the account. Accounts running Target ROAS with QS 7–9 keywords consistently outperform accounts running the same strategy with QS 4–6 keywords. The algorithm is doing its job in both cases; the relevance ceiling determines the result.
To diagnose Quality Score in a Smart Bidding account, add the Quality Score, Expected CTR, Ad Relevance, and Landing Page Experience columns to your keywords view. Filter for keywords with more than 100 impressions. Any keyword with two or more Below Average sub-scores is leaking efficiency on every impression; fix those before adjusting bids or budgets.
Performance Max and asset quality ratings
Performance Max campaigns do not show keyword-level Quality Scores because PMax does not use keywords in the traditional sense. Asset group quality ratings, rated Poor, Good, or Excellent by Google, serve the equivalent diagnostic function.
A PMax asset group rated Poor means Google judges the combination of headlines, descriptions, images, and videos you have supplied to be insufficiently varied or relevant to the audiences being targeted. The mechanics differ from keyword Quality Score, but the underlying principle is the same: Google rewards relevance with better placement and lower effective CPCs.
Move asset groups from Poor to Good by supplying the full complement of headlines (up to 15) and descriptions (up to 4), including keyword-rich text variations, uploading multiple image formats and aspect ratios, and adding video assets rather than letting Google auto-generate them. Auto-generated videos are rarely as relevant as purpose-built creative, and they signal to Google that the asset group is under-resourced.
Practical steps to raise your Quality Score
Most accounts that come to Shout Digital with CPA problems have the same cluster of Quality Score issues: ad groups that are too broad, landing pages that have not been updated in 12 months, and Responsive Search Ads with too many headlines pinned to position 1. The fixes are structural, not cosmetic.
Take any ad group with more than 10–15 keywords and split it by intent. “Running shoes” and “women’s trail running shoes” have different intents and need different ads and landing pages. Tighter groups produce higher ad relevance scores almost immediately after restructuring.
In Responsive Search Ads, include the exact-match keyword (or a close variant) in at least two of your 15 headlines and pin one to position 1. This lifts both ad relevance and expected CTR. Dynamic keyword insertion (DKI) is a shortcut, but it often produces unnatural headlines; write specific keyword variants manually where volume warrants it.
The headline of the landing page should echo the ad’s headline. The page should answer the specific question the keyword implies. If no existing page matches, create a dedicated landing page variant. See our guide on improving conversion rate from Google Ads traffic for the landing page mechanics that also lift Quality Score.
Google’s PageSpeed Insights gives a direct view of how your landing pages score on Core Web Vitals, the same signals used for Landing Page Experience. A mobile score below 50 on a keyword-driven landing page is a reliable source of Below Average ratings. Prioritise LCP (largest contentful paint) fixes first.
A keyword sitting at QS 2 or 3 after two rounds of structural fixes signals a fundamental mismatch between the query, your offer, and what you can deliver on the landing page. Pausing it improves the overall quality signal of the account. See our broader PPC guide for the keyword research and match type strategy that supports quality account structure.
When does it make sense to bring in a specialist?
Quality Score problems compound. A degraded signal environment left unaddressed for two or three months means higher CPCs, rising CPA, and a Smart Bidding algorithm working with weaker inputs, which produces worse automated decisions that further degrade performance.
The structural fixes in this guide (tighter ad groups, keyword-matched landing pages, RSA headline discipline) are achievable in-house. But they take time and sustained attention to implement across a full account, and they need to be revisited as the account grows. Most marketing managers overseeing Google Ads alongside broader responsibilities reach a point where account complexity outpaces available bandwidth.
Shout Digital’s Google Ads management service runs Quality Score audits as part of every account onboarding. We identify which keywords are leaking efficiency, which ad groups need restructuring, and which landing pages are suppressing Landing Page Experience scores, then implement the fixes as part of a broader 360 Growth Plan. Every account is managed by a senior paid media specialist with 10+ years of experience. If your CPA has been climbing and your budget has not changed, that conversation is worth having.
You can also read our guide to calculating CPC, CPL, and CPA to benchmark where your current numbers sit and identify how much room a Quality Score improvement creates in the account.
Frequently asked questions
Common questions from marketing managers diagnosing Google Ads CPA problems.
Updated June 2026. Shout Digital is a Melbourne-based Google Ads management agency delivering paid search campaigns with a proven track record across retail, ecommerce, B2B, and finance. For related reading, see our guides on building successful PPC campaigns, improving Google Ads conversion rate, and calculating CPC, CPL, and CPA. To discuss your account with a senior specialist, visit our Google Ads service page or contact us directly.
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