http://www.seochat.com/seo-tools/code-to-text-ratio/ 
Free
The code to text ratio refers to the percentage of actual text present on a web page. This tool extracts the text from paragraphs and anchor text from HTML code to calculate the content ratio.
The code to text ratio of a page is one of the important factors used by search engines to calculate the relevancy of a web page. A value of higher code to text ratio will ensure you in getting a good page rank for your web page. It should be noted that not all the search engines use the code to text ratio factor in their index algorithm, but most of them do. Sometimes having a higher code to text ratio than your competitors can make a difference in ranking results.
To use this tool simply put the URL along with its validation code shown on page and click text ratio.