How much is first page Google is a very popular question. You might be surprised on the difference between the #1 and #2 spot. There is no way to give exact numbers because of all the variables involved, but you can come pretty close. The first set of data you need is to know how many people are going to click on your website on first page Google.
This sample of traffic is from Chitika, which analyzed traffic entering their ad network from Google and broke it down by Google results placement. The #1 spot on Google received 34.35% of the clicks, which equaled almost the same amount of traffic when you combine #2, #3, #4 and #5 and way more than #5 through #20 (second page) combined.
We all know #1 is where you want to end up, but it is hard to believe the #1 spot received so much more traffic than the rest of the first page. On a side note, similar studies have shown that large brands like Amazon receive more clicks even though they are not in the #1 spot. This shows people trust brand names.
The largest jump in % is from the top of page 2 to the bottom of page 1. If you able to perform some SEO on your site and move to #10 from #11 you should see a 143% jump in traffic. However, the base number is very low, from 1.11% to 2.71% of overall traffic. As you move up the first page, the jumps do get larger.
The traffic data was based on a sample of 8,253,240 impressions across the Chitika advertising network.