Keyword Density is a parameter that will identify the number of times that keywords are repeated within the entire textual content of each page.

The parameter is determined by a simple count, the number of times the word is repeated divided by the number of words in the entire HTML.

Example: If a keyword is repeated 4 times within a content of 100 words, the density of that keyword will be 4%.

Nobody can confirm what is the ideal percentage that keywords should have to rank better, but based on my experience I can determine that what worked best for me is to achieve a keyword density between 4% and 6%.

It is very important not to abuse this technique since search engines penalize the website when any of its pages have a very high keyword density.

I have experimented many times to determine how agile Google is when it comes to identifying a high keyword density, and I can assure you that its effectiveness is 100%, so I recommend you not to exceed 6% of your keyword density.

The best suggestion I can give you is “Write for users with search engines in mind, never write for search engines with users in mind”.

Some free tools to check your keyword density:

http://www.keywordanalyzer.org/

http://www.web-inspect.com/keyword-density.php

http://www.icrossing.com/tools/calculator.htm

http://www.submitexpress.com/analyzer/

http://keydensity.com/keyword-density-checker-calculator

http://www.webjectives.com/keyword.htm

http://tool.motoricerca.info/keyword-density.phtml

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