how is one drink of alcohol defined?
<answer> One standard drink contains roughly 14 grams of pure alcohol, which is found in 12 ounces of regular beer, which is usually about 5% alcohol and 5 ounces of wine, which is typically about 12% alcohol. <context> That’s why it’s important to know how much alcohol your drink contains. In the United States, one standard drink contains roughly 14 grams of pure alcohol, which is found in: 1  12 ounces of regular beer, which is usually about 5% alcohol.  5 ounces of wine, which is typically about 12% alcohol.