21+ Calculating Proof Gallons. (80 proof ÷ 100) × 1 wine gallon = 0.8 proof gallons. How to compute and report proof gallons.

How to compute and report proof gallons. Ascertain the liquid gallons and multiply that figure by the proof (after pointing off two decimal places). (80 proof ÷ 100) × 1 wine gallon = 0.8 proof gallons.







