Beer, wine, and hard liquor (distilled spirits) all contain alcohol. The following common alcoholic drinks contain equal amounts of alcohol and are often referred to as a drink or a standard drink.

• One mixed drink containing 43 mL (1.5 fl oz) of 40% hard liquor, such as vodka, gin, rye whiskey, or rum
• One 142 mL (5 fl oz) glass of 12% wine
• One 341 mL (12 fl oz) bottle of 5% beer, hard cider, or hard seltzer.

Proof is the amount of alcohol in hard liquor or distilled spirits. The percentage of pure alcohol in the hard liquor is usually one-half the proof. For example, a 100-proof liquor is about 50% pure alcohol. Thus, the higher the proof, the more pure alcohol the hard liquor contains.