Should you include off-page content, like meta tags and titles, in your calculations? What about keyword frequency or keyword proximity or keyword prominence? And like I’ve said before, bear in mind that if your keyword density gets too high, search engines just might realize it and penalize your page.
But now, hold on. Even though keyword densities are getting to be a complex science with lots of complicated algorithms, you can do it!
Keyword densities really are not rocket science, so don’t fall into the trap of making things more complicated than they need to be. Go to Google and search on "keyword density." The first three pages should be ones that provide about 20 or 25 different tools for calculating KWD.
Now all you have to do is pick one that feels user-friendly to you and use it to optimize your web page, noting the results. Now try something else: run a Google search on your keyword, and run the analysis on the first ten sites. Take a good hard look at the results. From this, you should get a good idea how your page will compare with the ten top ranking pages in Google, at least in terms of keyword density.
Here’s the thing that frustrates people, though: if you go and do that with three or four different KWD tools, you will no doubt come up with different numbers, but the graph of those numbers will look very similar. Don’t worry about it, because the numbers aren’t the most important thing. You only care how they compare to each other.
Something else you'll probably discover is that keyword density is not a very good indicator of rank. The top ranking page may have a much lower density than the page at number ten, for example.
Why does this happen, when you work so hard to get your keyword density high? It happens because KWD is only one factor among many. It's important to a good ranking, but it's not the be-all and end-all of a good ranking. What you really want to know from your analysis is the range of density values that rank well. Chances are good that if your page is below that range, getting on page one to compete with the big dogs will be tough, and if you're above that range, the search engines may think you’re “keyword stuffing” and you’ll be penalized. Just remember, though, the numbers are guidelines you should know, not carved-in-stone rules that forever define your fate. Experiment!
You may hear self-proclaimed website gurus say that keyword density should always run between two and eight percent or whatever the current numbers being quoted in forums across the Internet happen to be. That’s partly true. Those numbers are probably fairly accurate for most keywords. They’re based on averages and it’s always good to stick close to an average.
But there’s a problem. Here’s how the problem goes: the most commonly used letter in English is the letter “E.” If you wrote a ten word sentence, it would be much easier to use the letter E five times in that sentence than it would be to use, say, the letter Z five times.
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