Keyword density also plays an important role in site optimization. First make your site keyword rich and use your target keyword in content. The SEO professional prefer to 3 to 7 % keyword density. Although there are no strict rules you can increase your density, but it not mean that you use too much keyword in a content, otherwise search engine consider that you stuffing of keywords.

Following are some tools to find a keyword density:

1 http://www.seochat.com/seo-tools/keyword-density/
2 http://www.ranks.nl/tools/spider.html
3 http://www.webconfs.com/keyword-density-checker.php 
4 http://www.linkvendor.com/seo-tools/keyword-density.html 
5 http://www.iwebtool.com/keyword_density 

From these tools you can easily check your keyword density.

Placing of keyword:

Very shot rule for SEO expert – start you document with the target keyword and try to highlight first keyword of document or using h1 and h2 tags, because search engine pay special attention to highlight keywords and h1, h2 and h3 kinds of keywords.

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