The best estimating of Keyword Difficulty is a complex formula deviced by the authors of seomoz.org . It is free, and it takes into account many the factors, like:

# of results in Google, Yahoo and others # of results with and without quotes # of paid ads Alexa ranking

Keyword Difficulty goes from 0 to 100%, although I never found any keyword higher than 0.5. Sex, hosting and Brittney all are around 0.45. Very weird keywords are usually 0.2 or so.

Thus, Total Results and Keyword Difficulty are used to calculate our new index. These factors influencing positioning difficulty were chosen because they are relatively easy to calculate. However, I wish I knew all what it takes to be always first in SERP. Of course, that is a valuable commercial secret.

A good Search Engine Positioning Index should be:

- Reproducible - Consistent - Non-manipulable - Easy to calculate - Accepted - Non-proprietary - Free (or cheap)

Then, I propose:

Keyword SEPI = Total page results for the keyword searched between quotes in Google * Seomoz.org Keyword Difficulty ^2(to the square) / (Position ^2)

Keyword SEPI is: Keyword Search Engine Positioning Index

To analyze multi-keyword results, such as those coming from a campaign, a tool or a SEO company, we consider the sumatory of the partial SEPIs.

We believe SEPI will be a useful index for the webmaster community. A free SEPI calculator is located in our website:

http://www.domaingrower.com/domain-valuation.htm

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