How much is one measure of alcohol?

One standard measure of alcohol typically contains about 14 grams of pure alcohol, which is roughly equivalent to one 12-ounce beer (at 5% alcohol by volume), a 5-ounce glass of wine (at 12% ABV), or a 1.5-ounce shot of distilled spirits (at 40% ABV). These measures can vary slightly by country, but the general guideline remains consistent.