Keyword Density :
See in the webpage that the keyword density is anywhere in between 1% to 3% and for getting better ranking in Google and other search engines, the starting 20 words of your website's webpage must have the keywords that you are targeting.
- To get the desired ranking in the Google, Bing, Yahoo, etc. search engine the keyword density is most important.
Tools :
To check the keyword density there are different tools.for-example: wordcounter.net