Bar Literacy · August 2026
Standard drinks in a cocktail
A transparent estimate can describe declared ingredients, but it cannot decide whether a person can drive or how they will feel.

NIAAA defines one U.S. standard drink as 0.6 fluid ounces of pure alcohol. The Evening Measure estimates a declared recipe by multiplying each alcoholic ingredient's volume by its ABV, adding the results, and dividing by 0.6. Water from ice can change concentration but not the pure alcohol listed in the formula.
Example: 2 oz of a 40% ABV spirit contains 0.8 fl oz pure alcohol. 0.8 ÷ 0.6 = 1.33 estimated U.S. standard drinks. This is not a BAC calculator, a time-to-drive tool, or a personal consumption limit.
Compare this approach on the Old Fashioned card and the Martini card. For a night out, arrange the trip home before ordering with a transport-first plan.
Reader note: This page is reviewed against the publication’s source and correction rules. Read the method · suggest a correction