Keyword density is a measure of the frequency with which a keyword appears in a particular block of text – usually some kind of article, landing page or sales page. It is important that articles should have an appropriate level of keyword density to appear relevant to that term both to search engines and to users. One would expect an article about Hill’s Race win to have the words ‘Hill’ and ‘Race’ fairly frequently if you’ve found the most relevant article. On the other hand you wouldn’t expect those words to be inserted into the article so often as to make it difficult (unpleasant) to read.
Calculating keyword density as a percentage is a useful tool. Simply calculate the percentage of times that word appears. For example the keyword density of ‘Hill’ in a 700 word article if it appears 7 times is 1%. There is no exact science for determining the ‘perfect’ keyword density as it varies hugely depending on the type of content and the intended target audience and even the topic itself. A good guide for Internet marketers to follow is that important keywords should appear often during the article but never so much that it would look unnatural to human readers. It’s a good idea to have the keywords appear in prominent positions – headings, during the introduction and conclusion of your article also. Some of these other factors can be just as important, if not more important than the keyword density itself.