How many keywords per post/page ?

How many keywords should I use per a post/page ?thanks

There is some mathematical formula for that i think. But I don't know it. LOL! maybe one of the SEO people can tell you what the ratio is.

I have seen people use formulas and I also have written for clients who ask for a percentage or keyword density. The latter would depend on the number of words in your post. If you have, say 500 words and you want a keyword density of 1%, you will have the keyword 5 times in that post. Most clients usually ask for between 1-3% keyword density. I'm guessing that if you go above that, you may be penalized or flagged for spamming those keywords. It's kind of weird though, because sometimes a keyword might naturally be used more than that in organic writing.

Recently, I'm not into calculating keyword density. As long as I have my keyword at the first paragraph, middle of the article and last paragraph...that's fine for me, and it works. Articles still have good rankings. The longer the article, the more I repeat the keywords along with other related keywords in the article.

i think about 2-3 times per 100 words but it must look good visitor must not think that it is repeated many times

tono485 said:

How many keywords should I use per a post/page ?thanks

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I've tested it and off-page SEO is much, much more important than on-page SEO. I know people will disagree with me because conventional wisdow repeats the value of on-page stuff, but I've tested it repeatedly with the same result.

If anything, too many identical/similar keywords on the same page can alert Google to the fact that you are doing SEO, which would cause harm.