The keyword density tool helps you reach the optimum keyword density for your keywords and terms.
The Keyword density tool is very helpful since the search engines use the keywords to determine the theme of your site. This helps decide relevancy for search terms. The keyword density tool helps you get the perfect density to get high engine placement.
If you put too many, you will be spamming. If you put not enough, you won't rank well. There is a perfect balance.
This keyword density tool tries to act like a spider. It filters out the usual "stop words" just like the spiders. It allows stop words embedded in a term, however.
The tool is going to show you the keyword density for terms with one, two or three words.