Google Updates Its Ad Quality Scoring

Google is rolling out an improved ad ranking algorithm for AdWords, with a little more transparency than before. They actually now give you a vague idea of what your ad quality score is.

AdWords is the system that places small text advertisements on a Google search results page or places text/image ads on pages in thousands of AdSense enabled sites around the world. (This is relevant for South African advertisers, because Google lets you target the pages on which your ad may appear by location -- so your ad could show exclusively on South African websites if that was your wish).

Those ads are designed and created by advertisers, and are associated with keywords that the advertiser "bids" for. When a searcher enters a search phrase that is or contains a keyword that an advertiser has bid for, the relevant ad appears as a "sposored link" in the upper right hand corner of the search results page.

But many people will bid for the same keywords, so several ads may appear. And the ad at the top of the list is not necessarily the one whose creator has bid the most for the keyword in question.

The Google algorithm takes more than just bid level into account when deciding which ads get precedence -- the "quality" of the ad plays into the ad ranking as well. (If that sounds confusing, it's because you are not supposed to know how it really works -- that way advertisers can't cheat the system and Google's competitors can't easily copy it).

One of the elements that go into the AdRank calculation which scores the quality of your ad is the quality of the landing page -- the page searchers get to if they click your ad. (The other elements are the actual click through rate your ad gets on Google, and the relevance of your keyword and ad text). In theory even if your bid is low you can have your ad displayed at the top of the list if you have a very high quality score, say because you have a good landing page. And, if your quality score is high, you can find yourself paying less per click than the ads placed below you.

This is because Google does not charge you the maximum you have bid for a keyword. You pay only one US cent more than you would have had to to pay if you were the next highest ranking ad.

Here's an example of how it works. Remember that you never actually get to know what your quality score is -- Google will tell you that it is good, average or bad but will not disclose the number. In any event, the score is recalculated every time a relevant keyword search is run.

Joe's Garage bids a maximum cost per click of $0.40 for the keyword "fanbelt"
Jill's Garage bids $0.65 for the same keyword.
Pete's Garage bids only $0.25.

Joe has a well worded ad that gets better click rates and has a good relevant landing page. Jill has not taken much care over her ad, doesn't get a lot of clicks, and sends clickers to her home page. Pete is somewhere in between. Google does its quality calculations and produces Quality Scores of 1.8, 1.0, and 1.5 for Joe, Jill, and Pete respectively.

Google multiplies Joe's maximum bid by his Quality Score and gives him a ranking number of 0.4 x 1.8 = 0.72.
Jill's ranking number is 0.65, her maximum bid (0.65) times her Quality Score (1.0).
Pete comes out as 0.25 x 1.5 = 0.38.

Joe goes to the top of the list, since he has the highest ranking number, with Jill second and Pete third. But what do they actually pay each time their respective ads get clicked?

For Joe to be listed in second place he would have to pay Jill's ranking number divided by his quality score (0.65/1.8), or $0.36. But he's ranked above her, so he must pay one cent more, or $0.37. Note this is lower than the $0.40 he actually bid.

For Jill to be listed in third place she would have to pay Pete's ranking number divided by her own quality score (0.38/1.0), or $0.38. But she's ranked above Pete so she pays a cent more, or $0.39. That's a lot less than she bid, but it is more than Joe is paying in the top slot.

Pete has nobody below him, so he pays only his minimum threshold fee (in this case only 4 cents) every time someone clicks his ad.

The moral of the story is that you can really lower your CPC rates by making sure you create good ads and use focused relevant landing pages. And being third on the list can be a really cheap option..

To become an instant expert on AdWords, go to Google's AdWords Learning Center".