Why not do a google search for a priming calculator? Sry, I haven't carbed anything, yet, but I know I've seen people reference priming calculators. I *think* people have said to use 1oz sugar per gallon, fill your bottles and fill one PET soda bottle as a tester. Let sit at 70F until tester bottle is firm(like a full bottle of soda), then try one of your other bottles. Again, this is advise I've seen online, haven't carbed anything myself, so take it with a grain of salt...just wanted to give you *some* feedback, since no one else responded...