SEPI: Total pages * Keyword Difficulty 2/ Position2
SEPI = Total SERP x Keyword Difficulty2 / Position2
SEPI: search engine positioning index
Total SERP: Total page results for the keyword searched in Google. The keyword can be a phrase, with or without quotes.
Keyword Difficulty: PageRank of the 10th site under that keyword.
There is a very good measure calculated from several factors, going from 0 to 1 (see below). We simplify this measure using PageRank of the 10th site under that keyword. 10th is arbitrary, but we found that the first 4-6 sites have a too high PageRank that does not reflect the term difficulty.
Position: position in Google SERP
Keyword Difficulty according SEOmoz.org
|0 - 15%||Non-competitive term, top rankings achievable with well optimized on-page keyword use|
|16 - 30%||Low competition, top rankings achievable with well optimized on-page keyword use and light link strength||35||Google First Place: 24% -|
|31 - 45%||Slightly competitive, top rankings require well optimized on-page use and moderate link strength||743||SEO Tools: 41.49%|
|46 - 60%||Competitive, top rankings achievable only with highly optimized on-page content and substantial link strength|
|61 - 75%||Highly competitive term, top rankings require on-page optimization, well-established history and robust link strength|
|76 - 90%||Exceptionally competitive term, top rankings only achievable with highly-established site and overwhelming link strength|
|91%+||Among the most competitive terms on the web, only the most powerful & popular sites can achieve rankings|
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