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Quality Score can seem like a bit of a mystery to new search advertisers.
The promise of search advertising is that ads will be shown for selected keywords, so long as the advertiser is willing to pay for the resulting clicks.
But with thousands of advertisers vying for top rankings on the same keywords, there’s clearly more to it.
That’s where Quality Score comes into play.
Why does Google use Quality Score, how do they calculate it, and how can advertisers improve it?
I served on the Quality Score team for Google Ads (then AdWords) while I worked at Google, so let me shed some light.
What Is Quality Score?
Quality Score is Google’s measure of how relevant a keyword is. As soon as Google has enough data, keywords in an advertiser’s account are assigned a score between 1 and 10, with 10 being the best.
This number is a representation of the aggregate relevance of the keyword across the many auctions in which it participates. It is meant to guide advertisers but it is not used to rank ads.
What is used to rank ads behind the scenes of every ad auction, is the real-time Quality Score that takes a lot of additional factors into account.
While the 1-10 number helps advertisers gauge how good a job they are doing at choosing the right keywords, writing good ads, and driving users to helpful landing pages, it’s the real-time Quality Score that really matters.
The real-time Quality Score is more granular than a 1-10 number but it is not shared with advertisers because it fluctuates all the time and is different for every single search that happens on Google.
Why Google Uses Quality Score
All of that sounds complicated, so why does Google have Quality Score?
They use it to help show more relevant ads to users every time a search happens.
Google depends on revenue from advertising so they have a big incentive to make sure users find the ads interesting and click on them.
If they allowed low-quality ads to take up space that could be filled with more relevant ones, they’d make less money in the short term and risk alienating users in the long term.
While it can sometimes be a struggle to improve Quality Score, it is useful for advertisers too because they like getting the type of high-quality leads that are possible with Google Ads.
For those leads to keep coming, advertisers have to do their part in picking relevant keywords and writing compelling ads. And when they do, it can lead to big wins by reducing their CPCs.
How Quality Score Is Calculated
Google has so much data about how users interact with search results that they can use “big data” with machine learning techniques to come up with a measure of the expected relevance of every ad, keyword, and landing page relative to every search that happens.
That’s a mouthful, so it’s called Quality Score.
Rather than asking Google employees to judge the relevance of every keyword, a process that would be hugely time-consuming, subjective, and prone to errors, they use the principle of the “wisdom of the crowds” to assign Quality Score. Specifically, their algorithms monitor what users interact with on the search results page (SERP) to make predictions about future interactions.
At its heart, Quality Score is really a predicted click-through rate (CTR).
In the early days of Google Ads, before Quality Score, they used CTR to determine if keywords were low relevance and should be disabled, or pay more to get a good position in the ad auction.
Over time, as machine learning techniques became better, Google started to consider more factors when determining expected CTR and the term Quality Score was introduced to replace the CTR component that had been part of the ad ranking mechanism before.
So the simplest way to think about Quality Score is as a measure of how likely it is that users will click your ad for a particular keyword.
Why Quality Score Matters
Advertisers care a lot about their Quality Score because it is one of the factors used to decide:
- Which ads are eligible to enter the ad auction.
- How the eligible ads are ranked.
- What actual CPC the advertiser needs to pay.
Entering the Auction
Google doesn’t want to show irrelevant ads and it’s easy to understand why. They charge advertisers primarily for clicks on their ads. If an advertiser uses a very high bid to hog a high position on the page with an irrelevant ad, it won’t get clicked on and Google won’t make any money.
Search advertising is a direct response advertising model and not a branding model.
For example, while a car manufacturer may think an ad for a new pickup truck would really resonate with someone looking up the score for the big game, that ad is unlikely to garner a click and hence is detrimental to Google Ads.
So when Google predicts a particular keyword to be very irrelevant and assigns it a very low Quality Score, that ad may not even enter into the auction for most searches.
On the flipside, having a high Quality Score ensures an ad is eligible to participate in more ad auctions so it moves on to the ranking step.
Once Google has selected the keywords and ads that are likely to be relevant for a search, those are entered into the ad auction.
This is a split-second auction where Google evaluates how much each one is bidding (max CPC), how relevant they are (QS), and what other factors like ad extensions may give a boost to the CTR.
Each ad gets a score and the resulting rank determines who gets their ad shown in the top slot, and who misses out on the first page of results.
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The actual CPC an advertiser has to pay for a click is calculated based on the CPC they would need to maintain their rank above the next ad in the auction.
This discount is the reason most advertisers have an average CPC that is lower than their max CPC.
Advertisers benefit from a higher Quality Score because it means they have to pay less to maintain their position versus their next competitor. In effect, the higher the QS, the less they have to pay for the same click.
How to Improve Quality Score
You can improve Quality Score by improving the relevance of your keywords, ads, and landing pages.
To focus your efforts, start by looking at the relative score of the three subcomponents of quality score:
- Expected click-through rate
- Ad relevance
- Landing page experience
The value for each component will be:
- Below average.
- Above average.
So this can guide you towards what to optimize.
Expected Click-through Rate
This is a measure of how likely your ad is to generate a click when the search term is exactly the same as your keyword. If it’s low, make sure the keyword is relevant to what you’re advertising.
Also consider that your ad may only be relevant in a limited number of cases.
For example, a dog walking service may sometimes be relevant for the keyword ‘dog’ however there are many searches a user might do including the word dog when they’re not looking for your service, but instead need a vet, dog food, or photos of dogs. This will negatively impact the CTR of the keyword and it may be time to consider adding more relevant keywords to the account.
If your keyword is relevant, but this score is low, try writing a stronger ad that is more compelling by highlighting its relevance to the keyword or by including a stronger call to action or unique value proposition.
This component measures how well the message in your ad matches the keyword. If this component is low, it may be because your ad groups cover too broad a range of themes.
A solution may be to split the ad group into smaller, more tightly themed ad groups.
For example, if you’re a pool contractor, keywords like “pool design,” “in ground pool construction,” and “pool renovation” may all be highly relevant, but when they are all in the same ad group where they share the same ad text, some relevance is bound to be lost.
By having too disparate a list of keywords grouped in one ad group, you can cause the ad that is shown to be too generic or about the wrong theme.
Don’t just rely on dynamic keyword insertion, but take the time to properly structure your account by building separate ad groups for each set of closely related keywords.
In the example before, each of the 3 pool related keywords is a different theme and should be in different ad groups.
Landing Page Experience
This final Quality Score component measures what happens after a user clicks the ad.
When searchers arrive on your landing page, are they happy they came or do they turn right around and leave?
If this component is too low, make sure that the landing page is closely related to what the user searched for and delivers on the promise in the ad.
Usually deep linking (i.e., linking to a specific landing page) is better than taking someone to the homepage.
Make it easy to use the landing page on both mobile and desktop devices. Make the page load fast and consider using an accelerated mobile page (AMP).
Offer unique and valuable content and treat the user’s data with respect.
Along with the bid, Quality Score is a major part of how Google decides which ads to show and how to rank them.
A good Quality Score can be just as beneficial as a high bid. In fact, ads with lower bids can beat those of higher paying competitors by having better relevance.
This makes PPC very appealing because it’s not just the biggest advertiser who always wins.
Monitor your Quality Score and tackle optimizations when a low Quality Score is holding you back from achieving your targets.
However, don’t get so bogged down with Quality Score that you lose track of the ultimate goal, which is to run an efficient business that makes a meaningful connection with new prospects through search marketing so that the people who work at the company make a good living, and users get their problems solved.