Two advertisers want the same search. One pays half what the other does and sits above them.
That is not a story about budget. The one paying less is not bidding more, and they are not spending more overall. They have simply done work that Google rewards with cheaper clicks, and the other advertiser has not, so they are paying a premium to sit lower on the page.
Quality score is the mechanism, and in most of the accounts we audit it is sitting untouched with a number in it that is quietly costing money every day.
The Auction Nobody Sees
When somebody searches, an auction runs in the time it takes the page to load.
Position is not sold to the highest bidder. It is decided by ad rank, which is your bid multiplied by your quality score, plus other contextual factors. That multiplication is the entire point, and it is worth sitting with for a second.
A quality score of 10 makes a $2 bid behave like a 20. A quality score of 4 makes a $5 bid behave like a 20 as well. Same position, wildly different price.
Google built it this way deliberately, and it was a genuinely good idea. In the early search engines you could bid on a keyword with nothing to do with your business and simply buy your way to the top, which made results worse for everyone. Tying position to relevance meant you could not purchase a place you did not deserve.
The side effect is that relevance became a discount, and it is one most advertisers never collect.
What It Actually Costs
Here are two advertisers competing for the same search.
Advertiser A bids $3.00 with a quality score of 10. Ad rank of 30.
Advertiser B bids $7.00 with a quality score of 2. Ad rank of 14.
Advertiser A is above them, having bid less than half as much. And because you pay only what you need to clear the advertiser below you, A ends up paying around $2.01 a click while B pays more than double that for the worse position.
Run that across a month. At a thousand clicks, the gap between a good quality score and a poor one is not a rounding error on a report. It is a materially different advertising budget for the same traffic.
The compounding is what makes it matter. A better score buys cheaper clicks, cheaper clicks buy more of them on the same budget, and more clicks on relevant searches produce the engagement that improves the score further. It runs the other way too, which is why a neglected account tends to get more expensive over time rather than staying still.
This is why quality score is worth understanding even though you cannot set it directly. You do not control the number. You control the three things underneath it.
The Three Components
Open your keyword view, add the quality score columns, and Google shows you the score plus three diagnostics, each graded Below average, Average, or Above average.
Expected click-through rate. Whether Google predicts people will click your ad, judged against competitors for that keyword rather than in absolute terms. It is Google's way of asking whether you are bidding competitively enough to be seen and written well enough to be chosen.
Ad relevance. Whether your ad matches the query. This is the most directly controllable of the three, and the one that responds fastest.
Landing page experience. Whether the page answers what the searcher asked, loads quickly, and holds people once they arrive.
Google does not publish how these are weighted, and anyone who tells you the exact percentages is estimating. What is not in dispute is that all three move the number, and that ad relevance is where the fastest gains sit.
Ad Relevance Is a Structure Problem
Here is what makes this chapter follow directly from the one on ad groups.
An ad written to cover forty keywords cannot closely match any of them. It has to be general enough to be true for all of them, which makes it specific to none. Google reads that as low ad relevance, and the whole keyword is marked Below average.
Split the group so five keywords that mean the same thing sit together, write an ad for that meaning, and the relevance grade moves. Nothing about the keyword changed. What changed is that the ad now answers it.
This also explains something that confuses people: the same keyword can carry a different quality score in two different accounts, or in two ad groups in the same account. The score is not a property of the keyword. It is a judgment about the keyword, the ad, and the page as a set.
In a B2B account we audited, keywords showed a quality score of 3 with expected CTR and landing page experience both Below average across the board. The cause was not the keywords. It was one ad group holding everything, so no ad could be relevant to anything.
Landing Page Experience Is the Slowest and the Most Ignored
Ad relevance responds in weeks. Landing page experience is slower, and it is where most accounts have simply never looked.
Two things matter most and both are measurable. Speed, especially on mobile, where we routinely find sites scoring near the bottom while their desktop version scores near the top. And whether the page answers the specific query rather than being a generic homepage receiving traffic from twenty different searches.
That second one is the connection people miss. Sending every keyword to your homepage is a structure decision, and it caps your landing page experience no matter how good the homepage is, because a page that answers everything answers nothing specifically.
The page itself gets its own chapter later in this series. For now the thing worth knowing is that it is not a separate concern from your ads. It is a third of the score that decides what you pay.
How to Read It Without Overreacting
Three cautions, because quality score is easy to misuse.
It is a diagnostic, not a KPI. Nobody makes money from a high quality score. You make money from cheaper clicks and better positions, and quality score is the lever. Optimizing the number for its own sake is a trap.
Low-volume keywords have unreliable scores. A keyword with a handful of impressions has a score built on almost nothing. Do not restructure an account around it.
A null score means no data, not a bad score. New keywords take time to earn one.
The useful way to read it: sort your keywords by cost, look at the highest-spending ones, and check their three diagnostics. A Below average grade on a keyword taking real money is worth fixing. The same grade on a keyword that spent four dollars is not worth an afternoon.
The Twenty Minute Version
- Add the columns. In the keyword view, add Quality Score, Expected CTR, Ad Relevance and Landing Page Experience. They are not shown by default, which is a large part of why nobody looks.
- Sort by cost, descending. Deal with where the money actually goes.
- Read the three diagnostics on your top spenders rather than the overall number. The components tell you what to do; the score alone does not.
- Below average ad relevance means the ad group holds too many ideas. Split it and write ads per group.
- Below average expected CTR usually means the ad is not compelling, or you are bidding too low to be in a position where anyone sees it.
- Below average landing page experience means check mobile speed first, then whether the page matches the query.
- Ignore keywords with negligible impressions. The score is noise at that volume.
None of this requires more budget. It is the rare lever in Google Ads that makes your existing budget buy more, because the price of every future click is partly determined by work you can do today.
We look at the three components on every audit, before anything about bids, because a bid adjustment on a keyword with a quality score of 3 is treating the symptom. If you would rather we worked through it, we can. If you would rather do it yourself, just add the columns. Most accounts have never had them switched on.
