A bottle labeled 90 proof contains approximately what percent ABV?

A bottle labeled 90 proof contains approximately what percent ABV?

• A. 45%
• B. 90%
• C. 18%
• D. 60%

Answer: (A)

Understanding how proof relates to ABV is key. In the US system, ABV is about half of the labeled proof. So a bottle marked 90 proof contains roughly 45% alcohol by volume. ABV tells you the actual percentage of ethanol in the liquid, independent of how the beverage is labeled. That’s why 100 proof is about 50% ABV, and 120 proof would be about 60% ABV. The other numbers don’t fit because they would require ABV values like 90%, 18%, or 60%, which correspond to proofs of 180, 36, and 120 respectively.

Understanding how proof relates to ABV is key. In the US system, ABV is about half of the labeled proof. So a bottle marked 90 proof contains roughly 45% alcohol by volume. ABV tells you the actual percentage of ethanol in the liquid, independent of how the beverage is labeled. That’s why 100 proof is about 50% ABV, and 120 proof would be about 60% ABV. The other numbers don’t fit because they would require ABV values like 90%, 18%, or 60%, which correspond to proofs of 180, 36, and 120 respectively.