Optmyzr Blog

How the Demise of Right-Side Ads Will Impact Google AdWords Advertisers

Feb 26, 2016
Google Ads

Frederick Vallaeys

Co-Founder & CEO



Google made a big change this month in how it displays ads on its search results pages (SERPs). They will no longer serve text ads on the right side of the organic results, a location where there used to be as many as 9 text ads before. Instead of showing up to 11 ads on a page, there is now only room for 7 ads. While this is a 36% decrease in the number of ads that can show, I think this will result in 18% more clicks for advertisers without changing anything to their accounts. While the removal of ads may sound like a negative, I think this is a big win for Google and for advertisers. Let me explain why.

The end of ads on the right side concludes Google’s longest experiment

Google is known for keeping products in beta for a long time but this one may have been the longest of them all. While Search Engine Land reports this experiment has been going on since 2011, the original work that led up to this month’s big change started well before that. I was on the Google team originally working on this back in 2008 when we added new ad slots below the search results in Australia and Japan.

Our goal was to test if bottom ads could be launched in larger markets as well. The reason we didn’t launch back then is that we weren’t considering turning off the ads on the right side but were merely going to add new slots at the bottom. Because we knew that bottom ads had better CTRs than those on the right, we thought it would be logical to award those slots to ads with better ad ranks.

The highest ranked ads would continue to show above the organic results, the next highest ranked ones would get the bottom slots, and the lowest ranked ones would fill out the right side. That proposal drew fire from advertisers who were more interested in seeing their ads above-the-fold than getting more clicks. It was a situation where the numbers clearly made a case for continuing with bottom ads but we could not convince the advertiser-base at the time that this was the right thing to do.

Then a few years later, Google started experimenting with 4 ads above the results with mortgage ads in 2010 and in 2011 they started serving ads below the search results in cases where they didn’t show ads on the right. These experiments have now culminated in the permanent removal of right side ads in favor of new ads below the organic results.

The new layout has been active on the majority of traffic for over a year

Remember that Google told us last year that the majority of queries happen on mobile in the US and 8 other countries and these devices have always had the ad layout we’re now getting on desktops. The layout of a mobile SERP has never had ads on the right side, and has instead shown ads above and below the organic results. Now the layout of ads on desktops and laptops looks more like what we’re already used to on mobile devices.

The number of searches on desktops has been declining for some time whereas mobile search volume has been growing.

decline of desktop search
The overall number of queries on desktops is decreasing.


Fighting for RHS ads was no longer a viable long-term strategy since those slots were part of a shrinking market. Competing aggressively for top positions on the other hand is a great long-term strategy because it goes after the most important ad positions for a growing segment of all searches. Now that mobile and desktop layouts look very similar, all advertisers will basically compete for the same positions. This reduces some of the complexities that advertisers had to deal with because one ad position meant different things depending on the device.

Clicks from right side ads are a small fraction of top ad clicks

Ads that show above the search results outperform ads on the right side in terms of CTR. Optmyzr’s data shows that ads shown at the top easily get 10 times the CTR of the same ads shown on the right side. This is consistent with recent reports from iProspect that their clients get 14 times better CTRs in top positions than on the right.

This change instantly increases clicks by 18%

Let’s take iProspect’s numbers to calculate how this change might impact the number of clicks available in AdWords, assuming all else remains the same.

iProspect says that the CTR of the top ads is 14 times that of RHS ads:

top ad CTR: 14_x
RHS ad CTR: 1_x

Let’s simplify our scenario by assuming there used to always be 3 ads at the top and 8 on the RHS. This is how many clicks there used to be to go around:

3_14_x (for the 3 top ads) + 8_1_x (for the 8 RHS ads) = 50*x clicks (the total clicks of a page)

If they just removed the RHS ads, that’d be 6.25% of all clicks on Google that they just relinquished:

8_1_x (for the 8 RHS ads) / 50*x (the total clicks of a page) = 6.25%

But remember they are adding one new ad at the top, that one may also get 14 times the clicks of a RHS ad.

4_14_x (for the 4 top ads) = 56*x clicks

That’s a 12% improvement from before but we’re not done because a few of the old RHS ads now move to the bottom where we expect them to get a better CTR than before, but let’s just say their CTR stays exactly the same:

4_14_x (for the 4 top ads) + 3_1_x (for the 3 bottom ads) = 59*x clicks

So with this change Google may have very well gone from 50_x clicks to 59_x clicks, an increase of 18%.

Advertisers should rejoice that there are now 18% more clicks to be gotten without doing a single thing.

Bottom ads have better CTR than sidebar ads

Back in 2011 Google said “On average, this [bottom ad] placement performed better than side ads in terms of click-through rate in our tests.” I suspect a large part of the reason is that the average user treats ads shown inline with organic results as another organic result and any decrease in CTR due to an aversion to advertising goes away.

CPCs will not go up

Let me be crass. While it is true that advertisers who used to occupy positions 8 through 11 may start to bid more aggressively, let’s remember they were bidding for a tiny fraction of the available clicks and the only reason for this behavior is that they didn’t care or couldn’t afford to bid more. These advertisers will need to fix the issues that prevented them from being more competitive in the ad auction in the past, whether it was a poor conversion rate, lower margins than their competitors or something else. They can’t afford to bid more so they won’t apply new pressure on the auction that would cause CPCs to increase.

But is it possible that first page bid estimates will start to increase now that a higher rank is required to be on page 1? I believe this will not be the case though I will monitor it and am happy to be proven wrong. I believe the increase in CTR of the new positions will offset any required increase in CPC. Remember that Ad Rank is a complex formula, but it all goes back to the days when it was simply as follows:

Ad Rank = Max CPC * CTR

Hence if the CTR goes up because of the new location where the ad is shown, the required CPC to maintain the same position will decrease. Hopefully Google doesn’t tune their formula to immediately remove the CPC discount from the new higher CTRs.

SEO will be hurt by this change

Companies with high organic rankings will see those listings get pushed further down the page, often below the fold. Organic advertisers are the losers with this change.

Advertisers who appear on page 2 will be hurt by this change

Advertisers whose ads have been relegated to page 2 of the results won’t simply make up lost volume with more clicks from the second page of results. A 2013 study shows that page 2 represents less than 5% of all traffic, and page 3 gets only about 1.1%.

traffic of serp by page number
Very little traffic comes from any page after the first page of Google search results.


Furthermore, ads relegated to the second page won’t get the top ad positions on page 2. Those premium slots remain reserved for ads that are known to be better so Google will just repeat ads from page 1 at the top of page 2.

Ads at the bottom convert as well as on the right Side

One fear is that ads at the bottom of the page may not convert as well as RHS ads. While this study is now quite old and didn’t account specifically for bottom ads, Google’s Chief Economist, Hal Varian, said that there is less than 5% variance in conversion rate for the same ad when it is shown in different locations on the SERP. Maybe they can update that study but this is the most authoritative information I have on the point of conversion rate.

Product Listing Ads are winners

While traditional text ads no longer appear on the right side, Product Listing Ads (PLAs), also known as Shopping Ads will continue to show there and this feed-based ad format has been a fast-growing segment of AdWords for retailers. It is good for e-commerce advertisers that Google is making shopping ads more prominent by removing the clutter around them.

What advertisers need to do

AdWords changes constantly and this is actually a change that requires most advertisers whose accounts are already in good shape to do very little, if anything at all. I recommend the following:

  • Monitor performance more closely for a few weeks. Changes in AdWords usually cause advertisers to react and that may cause some fluctuations in your positions and other metrics. Our MCC Dashboard and Anomaly Detection Enhanced Script™ can help you find anomalies.
  • If you need to improve ad rank, consider doing a Quality Score (QS) optimization. Optmyzr has tools to help with Quality Score and I’ve also written extensively about how QS works.
  • Monitor keywords that may be falling off page 1. Optmyzr has a One-Click Optimization™ that automates this.
  • Update #1 – I was asked to offer more data for the statement that bottom ads have better CTR than sidebar ads. Here’s a Google post on that topic which I also added to the original blog post.