Tag: Proof system

According to the TTB, the standard for a spirit to be labeled 80 proof in the United States is that it must contain 40% alcohol by volume. This means that for 80 proof tequila, 40% of the liquid in the bottle is pure alcohol.

In the United States, a standard calculation for alcoholic spirits dictates that proof is exactly double the percentage of alcohol by volume (ABV). This means that for anyone asking what proof is 30% alcohol by volume, the answer is precisely 60 proof. This specific strength is quite common among various liqueurs and aperitifs found in bars and homes across the country.