This is the Google guide to the Minimum Bid Quality Score:
For defining minimum CPC bid requirements and your overall keyword quality within Adwords, your Quality Score evaluates your keyword’s click through rate (CTR) and the relevance of the keyword, your ad’s text, and landing page.
Notice that, unlike the Ranking Quality Score, the Minimum Bid Quality Score uses the landing page. At the time of writing this, this is causing much anguish for affiliate marketers, who have suddenly found that their campaigns have gone from £0.10 minimum bids to £10 minimum bids. And all because Google doesn’t like their websites…
As long as your minimum bid is less than the amount that you are willing to pay for a click, then it’s irrelevant. However, this number is quite useful.
Unlike the Ranking Quality Score, you can actually see the Minimum Bid Quality Score on Adwords (the column is hidden, but if you look in one of the Adgroups, and customise the visible columns, you can elect to show it).

The Minimum Bid Quality Score and the Ranking Quality Score both use the CTR, Advert Text and Keyword Relevance. So the Minimum Bid Quality Score is probably the best guide that you have as to how good your Ranking Quality Score is – it’s far from perfect, but it’s a lot better than having nothing.
Lets look at the four factors in turn.
Page last updated by Steve Baker on May 11, 2008 at 7:09 pm.
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I love this guide…it is better than any Adwords book I’ve read!
Hi there – I think the Quality Score has been removed. It was there last month but I’m just setting up a new campaign and I don’t see it in my hide/show customisations….oh no…
Hi Annabel
Are you looking at the list of keywords? The Quality Score/Minimum Bid is still an option. If you’re not seeing it, make sure you aren’t looking at the list of Adgroups?
Steve