Ya know what is funny, seems only drug users and dealers fully understand the metric system in the US.
Basic tip if your in a room full of people and need to find out who uses or deals, ask out loud how many grams are in a quarter pound. Whoever lets the answer roll off their tongue like you had just asked what is 5 * 5 can ussually hook you up.
What is the price around here? Dunno I do not buy weed

I am smack tab in the middle of the "emerald triangle" in norther CA, so take your guesses.