Well if you just eat weed you are pretty much wasting your bud, you may get a little stoned but you won't get the potential out of it. To get really stoned you must dissolve the THC into a fatty substance such as butter. Your body will then be able to absorb it a lot better. I use a 1/4 of an ounce for 8 brownies so that's a little under a gram per brownie(correct me if my math is off). One brownie gets me plenty stoned, but I use double the pot that the recipe actually calls for. So I'm guessing about half a gram of bud will get you high when ingested properly. You have to realize that when you smoke, you are wasting over half the THC in second hand smoke, exhaled smoke and resin deposits. When you ingest it you are getting almost 100% of that THC.