To calculate keyword density in its simplest form, you divide the number of times that you have used a specific keyword by the total number of words in the text that you are analyzing and multiply the result by one hundred to achieve your percentage.
Therefore:
Keyword Density = (Nkr / Tkn) x 100
Where:
Density = your keyword density
Nkr = how many times you repeated a specific keyword
Tkn = total words in the analyzed text
Nkr = how many times you repeated a specific keyword
Tkn = total words in the analyzed text
