In August, Google reported that the average click-through rate (CTR) for banner ads dropped to .09% in 2010, down slightly from .1% in 2009.
This data tells us that most banner ads need 1,000 impressions to result in ONE click through to your website. One obvious lesson is how imperative it is for advertisers to take advantage of any performance edge they can find to increase their odds of success. The chart below presents click-through rates for different size banner ads, both static and flash-oriented.
View more results information on Google’s DoubleClick Advertiser Blog.