Just follow the following formula - (Nkr * Nwp / Tkn) * 100, Where, NKR = how many times you repeated a specific keyword Nwp= Nwp is the number of words in the phrase Tkn = the total words in the analyzed text
I use Yoast which is a Wordpress plugin that monitors the density of any given article along with other features that ultimately assist in properly optimizing your post.
Also, you can use SEO processor plugin on Wordpress, it is good for analyzing backlinks of a website, there is no doubt to it but I think it is paid...
Hey dotcompals, I have used this tool..It is awesome as compared to other tools that i was using since last time..Thanks for sharing such a good link...