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I'm thinking this might be an interesting metric to check in with you all about.
For a well optimized site I've been working on for years which has a position 1 + 2 for the key phrase in Google, I get about 600 visitors per month which is 25% of the 2,500 that the Google Keyword Tool reports.
For a new site that I am starting with, the same calculation yields a visitors / GKT ratio of 10%.
Surely this will vary site to site / market to market etc.
I'd love to get some feedback from others on this.
If you really want to see how many searches Google does, then there is a way of doing it. I was disappointed about the traffic my site was getting for its key phrase, despite being #1 in the SERPS and having the exact-match domain, so I spent a decent chunk of cash and bought myself the #1 Adword position on that exact match search. Then I could log into Adwords and measure the number of impressions on that search. That was an accurate number of searches on that phrase.
The problem with this is, it's expensive. I was having to pay $20 a click to stay up there and guarantee 100% coverage to get accurate stats for a week.
After doing that though, I changed my entire strategy away from exact-match domains and key phrases and I'm now just optimizing for the long tail instead.
The long tail is getting bigger, the head is getting shorter.
It would be interesting to see Avg search v/s impressions in adwords v/s Clicks for spot # 1 to 10 in general.
Who knows we get an answer to yo-yo effect of 4th position.
For my KWS
Position/Avg daily serach/Adwords daily impressions/CTR of organic link (% to impressions)