Keywords represent a word, or up to a three word phrase, that tells in detail exactly what your website is about. Even though these should be used throughout your site, you should never overuse them. You should use just the right amount to please the engines.
There is a great danger your site will be rejected or you will have very low rankings if your repeat keywords every line or every other word.
Your density is always equal to the percentage of you total keyword count on any given web page.
Ok, say you have 100 words on your website page, to make it simple. Now, do not add the the words and symbols used in the HTML coding. Say you have 5 keywords. Just divide the total number of keywords by the number of words on your web page.
Now we need to divide 5 by 100. Your keyword density is always a percentage of your sites page total word count, so multiply the total by 100 ( this is part of the formula always used not the word count in our example), now we have .05 x 100 = 5%
You should never exceed the accepted standard for most search engines that is between 3% and 5%. Doing this will cause the engines to think you are just trying to stuff the right words in your site to get higher rankings.
This rule applies for every page on your site, not just the home page. Here are some simple steps to check your page for your density:
Simply choose a page you would like to check. Then, copy and paste the content into a word-processing program like Word or Word Perfect.
Now that you have it pasted into your word-processing program go to the 'Edit' menu and click 'Select All'. Then in the 'Tools' menu select 'Word Count'. Write the number of words you have on that page on a sheet of paper.
Go to the 'Find' function located in the 'Edit' menu. Now in the 'Find' field type in the keyword you want to check. In the 'Replace' type that same word so you do not change your content.
When the replace function has completed, the program will give you a count of how many times it found that word or phrase. This will be your keyword count for that web site page.
You can now use your formula and figure out your keyword density for any page, when you are website writing, armed with the total keyword count and total word count. Keep the search engines smiling when they see one of your sites by staying inside the the accepted standards.