Use the free Keyword Density Analyser tool to see how many times your keyword occurs in relation to the text on your page. For the search engine optimization it is very important that there are not too many times of the keyword and also that there is a certain amount of occurances of the KW.
Just enter the URL of your website and the keyword or keyword phrase that you want to analyse and the tool gives you the number of the occurances and the relative number. than advises you how many times more or less to have the keyword in your text.