There isn't any. It's completely dependant on the settings you're using. If you use a size 12 font you're going to fit less on a page then with a size 10.
The actual font matters.

Not to mention the type of page you're printing onto. A4 paper will hold more text than the pages of a book, for example.

That why, whenever I need to convert, I make it a point to mention those details. That way people know the settings that caused it. And of course, there's also the matter of formatting.

You'll find more words on a page of pure description then you will one with most dialogue. Usually, anyway.