Do you use 30 grams of ground coffee to 500grams of water when using a French Press Plunger?

I have a Plunger and was worried about how much coffee I was putting in (2 heaped teaspoons to 500mil of water) . So I Googled as you do, and came across this vid:

[media=https://youtu.be/st571DYYTR8]

Going by what he suggested, my coffee has been weak. So I was wondering. How much do you use?