What exact measure defines a standard drink in terms of pure ethanol content in the United States?

Answer

0.6 fluid ounces or 14 grams

A standard drink is defined by the amount of pure ethanol it contains, which is standardized in the US as 0.6 fluid ounces or 14 grams of pure alcohol, irrespective of the beverage type.

What exact measure defines a standard drink in terms of pure ethanol content in the United States?
beveragedrinkconsumptionethanolalcohol