What is the KEI (Keyword Effectiveness Index)
The KEI compares the number of searches for a keyword with the number of search results to pinpoint which keywords are most effective for your campaign.
Suppose the number of searches for a keyword is 486 per month and Google displays 214,234 results for that keyword. Then the ratio between the popularity and competitiveness for that keyword is 486 divided by 214,234. In this case, the KEI 0.002.
The higher the KEI, the more popular your keywords are, and the less competition they have. That means that you might have a better chance of getting to the top.
KEI Guide Score Value
0 - 10 KEI Bad
10 - 50 KEI Good
50 + KEI a devine gift