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Your results will display both the count and density starting with the most frequently used words and phrases. (Keyword density is a calculated percentage based on the number of times a word or phrase is used, compared to the overall word count for that page.)
Keep in mind that SEO elements (including keyword density) should always take a backseat to quality on your web page or article. Otherwise, all SEO efforts are in vain because only pages that are interesting, entertaining, informational, or valuable in any other way will maintain a sustainable presence in search engine results.
However, it is just as important to use this keyword density tool and avoid the extreme of over-optimizing or under-optimizing. While there aren’t any proven guidelines set forth by Google for keyword density, you should keep your primary keyword(s) between 2 and 3%, and secondary keywords (long tail search phrases) between 1 and 2%.