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Did you you know that the percentage of times a keyword appears on your web page compared to the total number of words on that page can have an impact on the page's ranking?
Sure it does, and it's called “Keyword Density.”
Mention a keyword or phrase too many times and search engines will likely frown at your site. Do it a little less than necessary and search engines may not pick up enough signals to rank the page for that particular keyword.
Simply put, you ought to get your keyword density just right for the best search performance. Not too much, not too little!
But how can you start calculating how many times keywords appear on a web page or blog post? Can you even do it accurately?