From alcohol content to carbs, and even flavor profiles, we've got all the details on the best low carb beers.Coors Light – 5g carbs. 12 oz. Busch Ice – 4.2g carbs. Natural Light – 3.2g carbs. Keystone Light – 5g carbs. Bud Light – 7g carbs. Pabst Blue Ribbon – 12g carbs. Miller Lite – 3.2g carbs. Michelob Ultra – 2.6g carbs.