What is Keyword Density?

[Fatema]

a.The number of times the keyword is used / (DIVIDED BY) the total word count on page - (MINUS)the total words in HTML on the page
b.The number of times the keyword is used X (MULTIPLIED BY) the total word count on page
c.The number of times the keyword is used in the page description
d.The number of times the keyword is used in the page title
e.The number of times the keyword is used / (DIVIDED BY) the total word count on the page

[Venu]

E. The total number of keywords (key phrases) / total number of words (without stop words)


For example 500 words in the webpage. within that words 100 words are stop words (eg: the, is, on, upon, was, ...) net words 400. target keywords in that page 15.
keyword density = 15/400 =3.75
it's good. The keywords density is recommended between 2 and 5.