At its most basic level, KD refers to the percentage of total words on the page that are keywords. So, for example, to be properly optimized, you might need a 3% KD on Google and a 2% KD on Alta Vista. 2%-3% is considered a good keyword density.
Formulas for calculating KD (Keyword Density)
KW Density (KD) = Occurrence / Unique words
KW Density (KD) = Occurrence / Total words
Where total words would be the number of the words written in body excluding the html tags and Occurrence would be the number of a particular keyword. Keyword Density would be calculated for individual Keywords.
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