You are welcome Rajesh !!!
But if you have a 6% key word density are you automatically considered a spammer ?
I am using SeoQuake tool to check keyword density.
You can use an online keyword density checker to find it...addme.com/keyword-density.html...is a good tool...
dont use too much keywords in content and i think max keyword density is 5% in the whole content.
There may be two strategies by which you can measure the keyword density. the first one is you can check it manually by doing some simple steps . You are supposed to write an article on MS word by adding your key words and key word phrases and check the total no of word counts on that particular page and then find the total no of Keywords used on that particular page By using Ctrl+F shortcut and then find out the keyword density by using Calculator. Note that keyword density should not be more than 3-5% of the total word count. Rather than doing this, You may use some online keyword density checking tools for measure the keyword density.
Use Swoosty SEO Tool of Firefox add-on to check keyword density, PR, dofollow, whois and much more.