That depends!trainz71 said:Some say 3/4 cup and some say 1 cup...to 5 gallons...so I split it down the middle...not quite a full cup..would this make much difference? Thanks!
If your FG was 1.018 and you added 1/4 cup more than you needed, you have a potential for bottle bombs. BUT, your FG was low so you should be fine. The most that could happen is you will have some extra fizz in there. A good rule of thumb is: If you are unsure, add less! This will keep you from the dreaded bottle bombs!
The best way to measure would be with a scale! BeerSmith uses "Sugar Weight" because it is more precise and you can get very precise with your carbonation. I bought a scale off Ebay for under $10 with shipping and it helps me measure all kinds of things like hops, Belgian Candy sugar, among other things.
Cheers
Preston