All terms
Distillery glossary
Proof Gallon
A proof gallon is one liquid (wine) gallon of spirits at 100 proof (50% alcohol by volume) at 60°F. It is the unit the TTB uses to measure and tax distilled spirits.
Because spirits are stored and removed at many different proofs, the TTB standardizes everything to proof gallons so quantities and taxes are comparable. To convert, multiply the wine gallons by the proof and divide by 100: 10 wine gallons at 125 proof equals 12.5 proof gallons. Getting this conversion consistent everywhere is what keeps storage, production, and excise reports in agreement.
Related
See your distillery in Spirit Sight
Book a walkthrough with our team. We’ll show your operation - barrels, TTB, and the books - in one place.
Schedule a Demo