On average... 3 Oz per plant (if ur good) 28 (i belive) grams per oz, so 28x3 = 84 84 grams per plant (if ur lucky) expect about 30% of the plants to be male, which wont count for anything. and there ya go.
pappa puff is right i used hydro for the first time on my last grow and damn i got 5 oz from one plant and around 4 from the rest..when i was lucky to be getting 2 before...go hydro..