What percent should be the Keyword Density

Today, Keyword Density matters very little. Google suggests writing articles keeping in mind the user experience. Use keywords smartly in your article and place your keywords in the right places. This will give you better results.

If you think that if you use keywords again and again, you will rank higher in SERPs, then you are absolutely wrong!

Doing so can be really bad because Google may treat your page as "keyword stuffing" and penalize you.

I recommend you to keep 1-2% keyword density with Semantic Keywords. Semantic keywords are words that are synonyms, variations, or related.