Is There A Perfect Keyword Density For SEO?
(K9) The short answer to this is – no. There is no one-size-fits-all keyword density, no optimal percentage.
I do not subscribe to the idea that there is a certain percent of keywords per 1000 words of text to get a page to number 1 in Google. Search engines are not that easy although the key to success in many fields is simple seo.
I write natural page copy where possible always focused on the keyterms – I never calculate density in order to identify the best % – there are way too many other things to work on. Hey, I have looked, a long time ago 
If it looks natural, it’s ok with me. Normally I will try and get related terms in the page, and if I have 5 paragraphs, I might have the keyword in 4 or 5 of those as long as it doesn’t look like I stuffed them in there.
I think optimal keyword density is a bit of a myth these days, although there are many who disagree. Crazy stuff. I think the page I just linked to is the longest page on the internet debunking keyword density.
Written by Shaun Anderson
You are right.. there are a lot of SEO myths. Content you write should only be natural.
That’s absolutely right… I have seen few websites where keyword density is very high while they are ranking very well. So I think it doesn’t matter till your content is natural.