Understanding Quality Score and Its Impact on Ad Spend

This guide explains exactly what Quality Score is, how Google calculates it, what it means for your ad spend, and — most importantly — how to improve it systematically so your campaigns deliver more results for less money.

What Is Quality Score?

Quality Score is a diagnostic metric used by Google Ads to estimate the quality and relevance of your ads, keywords, and landing pages. It is measured on a scale of 1 to 10, where 10 represents the highest possible quality score. The score is calculated at the keyword level — each keyword in your account has its own Quality Score.

Quality Score is not just a performance indicator — it is a direct input into Google’s ad auction. It affects both where your ad appears and how much you pay per click. A higher Quality Score means better ad positions at lower costs. A lower Quality Score means worse positions at higher costs — or no ad showing at all.

The Three Components of Quality Score

Google calculates Quality Score from three underlying factors, each rated as Above Average, Average, or Below Average. Understanding each component — and how to influence it — is the foundation of every Quality Score improvement strategy.

Component 1 — Expected Click-Through Rate (CTR)

Expected CTR is the most heavily weighted component of Quality Score. It measures how likely your ad is to be clicked when it appears for a particular keyword — not your historical CTR, but Google’s prediction of future CTR based on your ad copy, keyword, and historical performance data.

Google compares your expected CTR against the average CTR of other advertisers targeting the same keyword. An Above Average rating means your ad is expected to generate more clicks than most competitors. A Below Average rating means Google predicts your ad will underperform — and penalises you accordingly.

Component 2 — Ad Relevance

Ad relevance measures how closely your ad copy matches the intent and language of the keyword being searched. Google wants ads to feel like a direct, specific answer to what the user is looking for — not a generic promotional message that happens to be triggered by the keyword.

The most common cause of Below Average ad relevance is having too many keywords in a single ad group, leading to generic ads that cannot be specifically tailored to each keyword. The solution is granular campaign structure — tightly themed ad groups where every keyword in the group is addressed by the ad copy.

• Splitting large ad groups into smaller, tightly themed groups
• Including the primary keyword in the ad headline
• Writing ad copy that directly addresses the specific problem the keyword represents

Component 3 — Landing Page Experience

Landing page experience measures whether the page users arrive at after clicking your ad delivers on the promise made in the ad — and whether it provides a positive, relevant, and trustworthy experience. Google evaluates this through a combination of algorithmic signals and user behaviour data.

Landing page experience is the component most frequently underinvested in by advertisers who focus entirely on ad copy and bidding. Yet a poor landing page experience suppresses Quality Score regardless of how excellent the other two components are.

• Relevance of page content to the ad and keyword
• Page load speed (especially on mobile)
• Ease of navigation
• Clarity of the page’s purpose
• Absence of excessive ads or interstitials
• Transparency about the business

How Quality Score Affects Ad Rank — The Auction Mechanics

To understand Quality Score’s impact on your ad spend, you need to understand how Google’s ad auction works. Many advertisers assume the highest bidder always wins — this is categorically false.

The Actual CPC Formula

Your actual cost per click is not determined by your maximum bid — it is determined by the Ad Rank of the advertiser below you, divided by your Quality Score, plus one cent. This means a higher Quality Score directly reduces the amount you pay per click, even if your bid stays the same.

This formula has profound implications. It means that improving your Quality Score from 5 to 8 can reduce your CPC by 37.5% — without changing your bid at all. Conversely, a drop from 8 to 5 increases your CPC by 60%. Quality Score is not a vanity metric — it is a direct multiplier on every dollar you spend.

The Real Cost Impact of Quality Score — A Worked Example

The following example illustrates how dramatically Quality Score affects advertising costs for five advertisers competing for the same keyword, each bidding $2.00 maximum CPC.

Quality Score	Max Bid	Ad Rank	Actual CPC	vs Average (QS 6)
10/10	$2.00	20	$0.72	−64% cheaper
8/10	$2.00	16	$0.94	−53% cheaper
6/10	$2.00	12	$1.25	Benchmark
4/10	$2.00	8	$1.88	+50% more expensive
2/10	$2.00	4	$3.75	+200% more expensive

The numbers above are illustrative but directionally accurate. An advertiser with a Quality Score of 10 can achieve the same ad position as an advertiser with a Quality Score of 2 while paying approximately one-fifth of the cost per click. This is not a marginal difference — it is a fundamental competitive advantage.

Quality Score Reference Guide

Use this reference to understand what your keyword-level Quality Scores mean and exactly what action to take at each level.

Score	Rating	What It Signals	Priority Action
9/10	Excellent	All three components Above Average. Your ad is highly relevant and your landing page delivers a superior experience.	Maintain current structure — protect this score as you expand the campaign.
8/10	Excellent	Strong performance across components. Minor optimisation opportunities remain.	Test new ad copy variations to push CTR higher. Audit landing page speed.
7/10	Good	Performing above average. One component likely rated Average rather than Above Average.	Identify the weakest component in Google Ads interface and focus optimisation there.
6/10	Average	Typical score for a moderately optimised campaign. Paying approximately the market rate per click.	Review ad relevance — is your ad copy specifically matching search intent? Split test headlines.
5/10	Average	Paying a CPC premium. Ad groups likely too broad or landing page relevance below par.	Restructure ad groups into tighter themes. Audit landing page for keyword relevance.
4/10	Below Avg	Significant performance issues. Paying 50%+ more per click than necessary.	Urgent: audit all three components. Check for keyword-ad mismatch and irrelevant landing pages.
3/10	Below Avg	Serious campaign health issues. Google may limit when these keywords trigger ads.	Pause poorly performing keywords. Rebuild ad groups from scratch with tight theming.
2/10	Poor	Near-maximum CPC penalty. Very poor relevance across the board.	Consider pausing keywords entirely and rebuilding with granular ad groups and dedicated landing pages.
1/10	Poor	Maximum CPC penalty. Google essentially deems the keyword/ad/page combination irrelevant.	Pause immediately. Rebuild the keyword, ad, and landing page combination from the ground up.

How to Improve Quality Score — A Systematic Approach

Improving Quality Score is not a single action — it is a systematic optimisation programme that works through each of the three components in order of impact. Here is the step-by-step approach.

The single most impactful structural change you can make to improve ad relevance and expected CTR is to move from large, loosely themed ad groups to tightly themed ones. Single Keyword Ad Groups (SKAGs) or Single Theme Ad Groups (STAGs) ensure that every ad in the group is specifically relevant to every keyword in the group — dramatically improving both ad relevance and CTR.

• Audit your current ad groups — any group with more than 10–15 keywords is almost certainly too broad
• Identify clusters of highly similar keywords (same intent, same search term variations) and group them into dedicated ad groups
• Write ad copy specifically for each tightly themed group — headlines should include the exact or near-exact keyword
• For high-volume, high-value keywords, consider creating a dedicated single-keyword ad group
• Adjust match types within tightly themed groups — use phrase and exact match to control which queries trigger each ad
• Review search term reports weekly after restructuring to identify new keywords to add or negative keywords to exclude

Ad copy is the primary lever for improving both expected CTR and ad relevance simultaneously. The goal is to write ads that feel like the perfect, specific answer to each search query — so relevant that clicking feels obvious.

• Include your primary keyword in at least one of the three headline positions — Headline 1 is most visible and highest impact
• Mirror the language of the search query as closely as possible — use the exact words your customers use
• Lead with the most compelling benefit or offer — what makes your business the obvious choice for this specific search?
• Use all available ad extensions: sitelinks (at least 4), callouts (at least 4), structured snippets, call extension, location extension
• Use Responsive Search Ads (RSAs) with 15 headlines and 4 descriptions — give Google enough material to find the highest-CTR combinations
• Pin your primary keyword in Headline 1 position to ensure it always appears
• A/B test headline variations systematically — change one element at a time and let data drive decisions
• Include a specific, action-oriented CTA in every description line: ‘Get a Free Quote Today’, ‘Book Your Consultation’, ‘Call Now for Immediate Service’

Landing page experience is often the most neglected Quality Score component and the one with the highest improvement potential for most advertisers. The landing page must deliver exactly what the ad promises — in terms of content, offer, and user experience.

• Match the headline of your landing page to the headline of your ad — message match is the most important landing page principle for Quality Score
• Include your target keyword naturally in the headline, first paragraph, and throughout the page content
• Remove navigation menus from paid traffic landing pages — reduce friction and keep visitors focused on conversion
• Improve page load speed: Google evaluates landing page speed as part of landing page experience. Target LCP under 2.5 seconds on mobile
• Make your business’s identity clear: business name, contact details, trust signals, and what you do should be immediately obvious
• Include social proof: testimonials, reviews, case studies, and trust badges reduce bounce rates and improve engagement signals
• Ensure the page is fully mobile-responsive — the majority of ad clicks arrive on mobile devices
• Create dedicated landing pages for each major ad group theme rather than sending all traffic to a generic homepage

Irrelevant search queries triggering your ads are a direct cause of low CTR and poor ad relevance — which suppresses Quality Score. A robust negative keyword strategy filters out non-converting traffic and improves the signal-to-noise ratio of your Quality Score calculation.

• Download your Search Terms report weekly and identify queries that are irrelevant to your business
• Add irrelevant terms as negative keywords at the campaign or ad group level
• Build a negative keyword list before launching any new campaign — start with obvious mismatches (job seekers, competitors, irrelevant industries)
• Use negative keyword match types strategically — phrase negatives are usually the right balance of precision and coverage
• Review search terms monthly as part of your ongoing campaign management routine
• Use campaign-level negative keyword lists that apply across multiple campaigns for efficiency
• Be careful not to over-negate — removing relevant queries that happen to contain negative terms can suppress valid traffic

Dynamic Keyword Insertion (DKI) automatically inserts the user’s search term into your ad copy — creating the impression of a highly specific ad tailored to that exact query. When used correctly, DKI can significantly improve both ad relevance scores and click-through rates.

• Insert DKI in Headline 1 using the syntax: {KeyWord:Default Text} — Google replaces this with the triggering keyword
• Only use DKI in ad groups where all keywords are appropriate to display verbatim in the headline
• Always set a sensible default text in case the keyword is too long or inappropriate to insert
• Test DKI ads against standard ads in the same ad group — measure CTR and conversion rate differences
• Use ad customisers for countdown timers, location-specific offers, and inventory-based messages to improve relevance
• Avoid using DKI if your ad group contains keywords that would look strange or inappropriate as ad headlines

Quality Score improvement is an ongoing process, not a one-time fix. Regular monitoring of your component scores, combined with systematic A/B testing and search term management, ensures your Quality Scores trend upward over time.

• Check Quality Scores weekly at the keyword level in your Google Ads account
• Monitor the three component ratings (Expected CTR, Ad Relevance, Landing Page Experience) — not just the overall score
• Set up a custom column in Google Ads to display Quality Score alongside other key metrics
• Prioritise keywords with high spend and low Quality Scores — these represent the biggest cost savings
• Track Historical Quality Score using a third-party tool like Optmyzr or manually via a spreadsheet
• After implementing changes, allow 2–4 weeks for Google to recalculate scores before evaluating results
• Document all changes with dates — correlating Quality Score movements with specific actions reveals what works in your account

Common Quality Score Misconceptions

Common Misconception	The Truth
Quality Score is a direct ranking factor in the auction	Quality Score is a diagnostic metric, not the direct auction input. Ad Rank — which uses auction-time quality signals, not the stored QS number — determines actual position.
A score of 7 is good enough — no need to improve	Every point of Quality Score improvement reduces your CPC. Moving from 7 to 8 is as valuable as moving from 5 to 6. Continuous improvement always pays off.
You should delete keywords with low Quality Scores	Low QS keywords can be improved — pausing them should be a last resort after optimisation attempts fail. Deleting resets any historical Quality Score the keyword has accumulated.
High bids will compensate for poor Quality Scores	Higher bids do improve Ad Rank, but at exponentially increasing cost. It is far more efficient to improve Quality Score than to outbid competitors with low QS.
Quality Score is calculated in real time at auction	The displayed Quality Score is an estimate based on historical data. Actual auction quality is evaluated in real time using broader signals, but the displayed score is updated periodically, not continuously.
Landing page Quality Score only applies to your page design	Google evaluates landing page relevance (does the content match the ad and keyword?), transparency (is the business clearly identified?), and ease of navigation — not just visual design.

Quality Score Quick-Win Action List

This article was written by the Innovsystems team. Innovsystems is a results-driven digital marketing agency specialising in SEO, PPC, social media, content, AI automation, and influencer marketing.