The standard drinking size for beer in the United States is 12 ounces for a beer with 5% alcohol by volume (ABV). This size contains about 0.6 fluid ounces (14 grams) of pure alcohol, which defines one standard drink. Beers with higher alcohol content, such as 10% ABV, count as two standard drinks for the same 12-ounce serving. So, typically:

• A 12-ounce beer at 5% ABV is one standard drink.

This is the commonly accepted standard for measuring alcohol consumption in beer. If you want to compare, other standard drink sizes include 5 ounces of wine at 12% ABV and 1.5 ounces of distilled spirits at 40% ABV. This standard helps with understanding alcohol intake and drinking responsibly.