I think you have to experiment and go with personal taste. I can't even say how much I use. I grind a certain amount (which is not always accurate with my inexpensive but useful grinder), then I pour the grounds in the filter basket, and judging by eyeball, estimate the amount of water I need to add.
Personally, I like my coffee just shy of being able to stand a spoon up in it.
I broke the carafe for my french press a while back and haven't replaced it. I need to get another one. IMHO, nothing tastes as good as french press.