Proof Definitions and Conversion Factors

Proof The ethanol content of a liquid at SOT (15.56°C) stated as twice the percent of ethanol by volume. Proof = 2 X volume percent ethanol in a liquid (at 60 F) 

Apparent Proof The equivalent of proof for ethanol solutions containing ingredients other than water (i.e., denatured alcohol). Apparent proof is determined by specific gravity readings for ethanol-water mixtures at 60/60°F. 

Proof Gallon Amount of ethanol in one wine gallon of 100 proof alcohol at 60 F. 

Wine Gallon A United States gallon of liquid measure equivalent to the volume of 231.2 cubic inches. 

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