Originally Posted by Frodo
Looks like 6 gal to me. You'll want gallon marks on the carboy anyway, so just add a gallon at a time, and mark the glass with nail polish as you go. The top "ring" below the neck is where the carboy is "full" and whatever your volume is at that point indicates the size of the carboy.
Great tip! Thanks, I will do that tonight. I would like to start this batch on Saturday. I can't wait!!