Tag: Proof calculation

According to the U.S. standard for measuring alcohol, a liquor's proof is two times its alcohol by volume (ABV). This straightforward formula means that if you are asking what proof is 30 percent alcohol, the answer is 60 proof. This strength is commonly found in many different types of alcoholic drinks, particularly liqueurs and mixed cocktails.

In the United States, 40% alcohol by volume (ABV) translates directly to 80 proof. This simple doubling rule is the standard for spirits, defining a widely recognized benchmark for liquor strength, found in countless vodkas, whiskeys, and other spirits.

According to the Centers for Disease Control and Prevention (CDC), a standard U.S. drink of spirits is 1.5 ounces of 80-proof liquor, meaning an 8oz of whiskey contains more than five standard drinks, depending on its proof and how it's poured. This guide breaks down the math behind calculating how many drinks are in an 8oz of whiskey for responsible consumption.