Whether or not you have intentionally attempted to manipulate the search engines with your keyword usage, what matters is what the search engines "think". Search engines can factor keyword density into their formula for determining the degree a web page may - or may not - be relevant to a specific search keyword or keyword phrase.
To help you proactively prevent penalties for what a search engine might deem to be keyword stuffing (i.e., overuse of keywords), Rank Ranger's On-Page Keyword Density tool measures the keyword density of any web page. By analyzing the number of times a keyword or phrase appears on a web page vs. the total number of words on that page, we calculate and display the number of occurrences and keyword density percentage.