What calculation method is used to find the percentage of alcohol from its proof?

The method used to find the percentage of alcohol from its proof involves dividing the proof by two. This is based on the convention that proof is defined as twice the percentage of alcohol by volume. For instance, if a beverage has a proof of 80, it contains 40% alcohol by volume. This calculation is straightforward: you simply take the proof measurement and halve it to obtain the corresponding alcohol percentage.

Understanding this method is critical, especially in the context of Alcoholic Beverage Control and regulations surrounding the sales and distribution of alcohol. Recognizing how proof translates to alcohol content helps ensure compliance with legal definitions and assists in responsible service of alcoholic beverages.