Google Ads Quality Score Explained (and Why It’s Costing You Money)

Quality Score is Google’s 1-to-10 rating of how relevant and useful your ad and landing page are for a given keyword, and it directly affects what you pay per click — a low score can mean paying two or three times more than a competitor bidding on the exact same keyword with a stronger score. It’s built from three components: expected click-through rate, ad relevance, and landing page experience. Fix those three and your cost per click drops without you needing to raise your bid at all. Here’s how each one actually works.

Why Quality Score exists and why it matters to your budget

Google’s ad auction doesn’t simply award the top spot to whoever bids highest — it multiplies your bid by your Quality Score to determine your actual ad rank and what you pay. This means a business bidding R8 per click with a strong Quality Score can outrank and outspend-efficiently a competitor bidding R15 with a poor one. Most businesses never check this number and simply assume their costs are fixed by the competitiveness of their industry, when a meaningful chunk of what they’re paying is actually a self-inflicted quality penalty.

Component one: expected click-through rate

Google predicts how likely your ad is to be clicked when shown for a specific keyword, based on historical performance data. Ads with generic, vague copy that doesn’t clearly connect to the search term tend to underperform here. The fix is straightforward but often skipped: write ad copy that directly reflects the specific keyword being targeted, rather than one generic ad running across dozens of loosely related keywords. An ad for “emergency plumber Cape Town” should say something different from an ad targeting “geyser installation Cape Town,” even if both link to the same business.

Component two: ad relevance

This measures how closely your ad’s actual text matches the intent behind the specific keyword it’s showing for. Broad, one-size-fits-all campaigns where a single ad group contains dozens of loosely related keywords consistently score poorly here, because no single ad can be genuinely relevant to that many different searches at once.

Tightly themed ad groups — where each group contains a small cluster of closely related keywords, with ad copy written specifically for that cluster — score meaningfully better. This takes more setup time than one broad campaign, but the cost savings from a higher Quality Score usually outweigh that time investment within the first month.

Component three: landing page experience

Google assesses whether the page someone lands on after clicking your ad genuinely delivers what the ad promised, loads reasonably fast, and provides a good experience, particularly on mobile. Sending every ad to your generic homepage, regardless of what was searched, is one of the most common and costly mistakes here — someone searching “geyser repair” who lands on a broad “welcome to our business” homepage, rather than a page specifically about geyser repair, both converts worse and drags down your Quality Score.

Dedicated landing pages matching each ad’s specific offer — even simple ones — consistently improve this component. Page speed matters here too; a slow-loading landing page hurts both Quality Score and the actual conversion rate once someone does land there, a connection we cover in more detail in our piece on what actually determines website cost and quality.

How to actually check your Quality Score

Inside Google Ads, add the Quality Score column to your keyword view (it’s not shown by default, which is part of why so few business owners have ever looked at it). You’ll see a score from 1 to 10 for each keyword, along with a breakdown of the three components rated as “below average,” “average,” or “above average.” This breakdown tells you exactly which of the three areas needs attention for each specific keyword, rather than leaving you guessing.

A realistic scenario

Imagine a home renovation company running one broad ad group covering “kitchen renovation,” “bathroom renovation,” and “home extension” together, with a single generic ad and everything pointing to the homepage. Their cost per click sits around R22, and they assume that’s simply what the industry costs. Splitting this into three tightly themed ad groups, each with its own specific ad copy and its own dedicated landing page matching that exact service, is a realistic path to meaningfully lower Quality Score-driven costs — often 30 to 50% lower cost per click for the same keywords, without changing the bid strategy at all.

Why this matters especially in a competitive market like South Africa

In competitive categories, cost per click can already run high before Quality Score even enters the picture. A poor score compounds that problem, sometimes doubling costs on top of an already expensive baseline. For businesses watching every rand of ad spend closely, this is frequently the single highest-leverage fix available — cheaper and faster to implement than most other optimisation work, because it doesn’t require more budget, just better structure.

What Quality Score doesn’t fix

A strong Quality Score reduces cost per click, but it won’t rescue a fundamentally weak offer, an uncompetitive price, or a business targeting the wrong keywords entirely. It’s a multiplier on efficiency, not a substitute for the underlying campaign strategy being sound in the first place — worth pairing with a genuine look at whether you’re bidding on the right terms at all before assuming Quality Score alone will fix underperformance.

How Outview approaches Google Ads structure

Building tightly themed ad groups with matching landing pages is core to how we structure every Google Ads account we manage — it’s less glamorous than headline strategy work, but it’s often where the most immediate, measurable cost savings actually come from. If you want to understand the fuller picture of what Google Ads costs in South Africa before diving into optimisation, our Google Ads pricing guide is a useful starting point.

FAQ

What’s considered a good Quality Score?
7 or above is generally considered strong. Scores of 5 or below usually indicate a meaningful, fixable problem in one of the three components worth investigating immediately.

Can I improve Quality Score without increasing my budget?
Yes — this is precisely the appeal. Quality Score improvements come from better ad copy, tighter keyword grouping, and better landing pages, none of which require spending more on bids.

How long does it take to see Quality Score improve after making changes?
Google typically updates Quality Score within a few weeks of consistent performance data on the improved ads and pages, though some movement can appear sooner.

Does Quality Score affect all campaign types equally?
It’s most directly relevant to Search campaigns. Display and Shopping campaigns use somewhat different quality signals, though the underlying principle of relevance still matters across all campaign types.

Key Takeaways

Quality Score is Google’s 1-to-10 relevance rating that directly multiplies into what you pay per click. It’s built from expected click-through rate, ad relevance, and landing page experience. Broad ad groups with generic ads and a single landing page consistently score poorly on all three. Tightly themed ad groups with matching, specific landing pages can cut cost per click substantially without raising bids. This is one of the highest-leverage, lowest-cost fixes available in an existing Google Ads account.

If your cost per click feels high and you’re not sure why, get in touch for a Quality Score audit of your existing account.