10.66667 cans of beer in a gallon - regular 12oz. cans. If you down 11 cans (a little bit left in each can, like a few drops and some foam/suds) you have drank a gallon.

Well, the question your asking is basically impossible. It's like asking to convert a gallon of water into cans of pop. It is possible to convert the gallon of water into cans of water not soda. So you can convert dBm to watts, not dBi.