What is a standard serving of alcohol? 12 ounces of beer 5 ounces of wine 1.5 ounces of 80 proof liquor or 1 ounce of 100 proof Note: These standards are based on 5% alcohol in 12 oz. beer, 12% alcohol in a 5 oz. wine. Course Progress Slide 42 / 121 Audio file Your browser does not support the audio element. Course Resources GlossaryIncident FormNew Employee FormFAQsHelpful Links