Rorty has a guage chart on his site, it seems to be a bit different than what we use in canada though. We sell gauge plate at my shop, I don't have a chart in front of me but just off the top of my head....
16ga....062
14ga....074
12ga....104
11ga....119 (not sure about this one)
10ga....134
3/16....188
1/4....250
etc.