To answer your question, I believe that a density of 1-2 % is good.
5-10% is too much in most cases just make sure you don’t repeat
the same words too many times.
I always use the following checklist:
1.Having keywords on the page.
2.Keywords in the domain name.
3.Keywords in the URL.
4.Keywords in H1, H2, H3 tags.
5.Keywords in bold, strong, italic, emphasis, and larger size.
6.Keywords in on site links and off site links. As long as your pages appear pretty natural, you won’t have much to worry about. Just write as you would normally write, make sure your keywords are in your title, URL, and perhaps the domain name, and get keyword-rich links back from relevant sites.
Once i read some where formula of keyword density that is
Total Word Count: suppose 400
keyword uses: 12
density = (12*100)/400
Many o fmy SEO friends suggest that in your first 50 words many of the keywords must be include..Also keyword density is from 1 to 3% not more than that.
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