First, a quick definition. Keyword density is the frequency of a particular search phrase within a body of text or element within a web page. If a keyword phrase appears 100 times within the body of a web page with 1000 words, this frequency represents a keyword density of 10%.
I recently began thinking about keyword density after researching the question and learning that very few experts agree on the proper percentage of keyword density needed to achieve superior search engine results for a given keyphrase. So, we set out to run some analysis on a high-value, highly competitive search phrase to see what we could learn about keyword density. We selected the top search engine results pages and ran the results through a keyword density analyzer; we tabulated the results below.
How to Test Keyword Density: What Keyphrase to Test?
Our test had a few parameters:
First, the search phrase had to be something that was competitive. We wanted to test a search phrase that the SEO’ers had worked hard to optimize. A competitive phrase was more likely to have been tested and retested to obtain high rankings.
Second, we wanted a phrase from within the world of SEO–again, a phrase that was worked by its handlers, people that are versed in the idea of keyword density.
So, we settled on the phrase "SEO Expert".