PeterHoggan
New Member
KEI is an acronym of Keyword Effectiveness Index its goal is to highlight the most effective keywords to target by comparing search frequency or popularity with competing pages. Sumatra Roy is credited with inventing KEI and a slightly tweaked version was later incorporated into Wordtracker. (Keyword services for professional search engine optimization)
By way of example the terms “seo company” and “seo services” were searched 22,200 times and 27,100 respectfully in the UK last month according to Google’s Keyword Tool (https://adwords.google.co.uk/select/KeywordToolExternal). To calculate KEI we divide these numbers by the number of pages returned for an exact match search for each term on google.co.uk.
The higher the KEI, the more popular the keywords are, and the less competition they have, which means they have a better chance of getting to the top. These calculations are based on the Sumatra Roy’s original calculation; Wordtracker tweaked the calculation slightly (P^2/C) or (P/C*P) to put more weight on popularity (P) and less on competing pages (C). Using the new formula we get the following KEIs:
Wordtracker tweaked the calculation in recognition of a fundamental failing i.e. the number of competing pages (C) fails to reflect any level of competition. It’s simply the number of pages that contain an exact term match, which in reality tells us nothing about the efficacy of the optimisation used on those pages or what is required to compete with them.
In both sets of calculations above “seo company” emerges with the highest KPI (+38% and +22% respectfully),even though “seo services” is by far the most popular search. Furthermore the calculation still takes into account the number of competing pages, although to a lesser extent. Yet the number of pages “competing” for any term is somewhat irrelevant, what is relevant is the number of pages driving traffic for a term. Regardless of the keyword phrase or how many results are returned for an exact search those pages number 30 and are found on the first three search engine results pages.
So, to calculate the real level of competition you need to evaluate these pages, this is something KEI cannot accomplish and involves reverse engineering and identifying the tactics used by these pages to attain their position. Anything beyond the first 30 results are not competition they’re also-rans.
Nota Bene: The numbers used for popularity in the above examples represent UK local search volumes and were obtained from Google’s Keyword tool. The number of competing pages was derived by conducting an exact match search on google.co.uk (web results). The reason for this was to present figures that are relevant to a UK market.
By way of example the terms “seo company” and “seo services” were searched 22,200 times and 27,100 respectfully in the UK last month according to Google’s Keyword Tool (https://adwords.google.co.uk/select/KeywordToolExternal). To calculate KEI we divide these numbers by the number of pages returned for an exact match search for each term on google.co.uk.
- “seo company” 22,200/1,530,000 (KEI = 0.0145098039)
- “seo services” 27,100/2,580,000 (KEI = 0.010503876)
The higher the KEI, the more popular the keywords are, and the less competition they have, which means they have a better chance of getting to the top. These calculations are based on the Sumatra Roy’s original calculation; Wordtracker tweaked the calculation slightly (P^2/C) or (P/C*P) to put more weight on popularity (P) and less on competing pages (C). Using the new formula we get the following KEIs:
- “seo company” 22,200/1,530,000*22,200 (KEI = 322.117647)
- “seo services” 27,100/2,580,000*27,100 (KEI = 284.655039)
Wordtracker tweaked the calculation in recognition of a fundamental failing i.e. the number of competing pages (C) fails to reflect any level of competition. It’s simply the number of pages that contain an exact term match, which in reality tells us nothing about the efficacy of the optimisation used on those pages or what is required to compete with them.
In both sets of calculations above “seo company” emerges with the highest KPI (+38% and +22% respectfully),even though “seo services” is by far the most popular search. Furthermore the calculation still takes into account the number of competing pages, although to a lesser extent. Yet the number of pages “competing” for any term is somewhat irrelevant, what is relevant is the number of pages driving traffic for a term. Regardless of the keyword phrase or how many results are returned for an exact search those pages number 30 and are found on the first three search engine results pages.
So, to calculate the real level of competition you need to evaluate these pages, this is something KEI cannot accomplish and involves reverse engineering and identifying the tactics used by these pages to attain their position. Anything beyond the first 30 results are not competition they’re also-rans.
Nota Bene: The numbers used for popularity in the above examples represent UK local search volumes and were obtained from Google’s Keyword tool. The number of competing pages was derived by conducting an exact match search on google.co.uk (web results). The reason for this was to present figures that are relevant to a UK market.




