What is keyword density and what is the formula for knowing keyword density?

[Rscomp]

What is keyword density and what is the formula for knowing keyword density?

[evejones]

Keyword density is a measure of the relative importance of a keyword on a given page, based on its rate of occurrence.

[ImpalaWardrobes]

Keyword density is the percentage of the number of times a keyword appears on a page divided by the total number of words in that page. So if in an article of 100 words you are using your keyword 10 times, your density will be 10%. Many people use different formulas to calculate keyword density (like this one)

[RH-Calvin]

Keyword density is the measurement in percentage of the number of times a particular keyword or phrase appears compared to the total number of words in a page.