Calories from alcohol tend to have a more complicated agenda than those from other food components. Much depends on your diet, your overall health and your drinking habits. Regarding strict calorie content, one gram of alcohol contains about seven calories. Compare this with carbohydrates and proteins, which contain four calories per gram, and fat, which contains nine calories per gram. While there can be brew-to-brew variances, the alcoholic content of beer is about 5 percent by volume, except in states or counties having regulations that limit alcohol content to 3.2 percent. There will be additional carbohydrates in beer, and there can also be an additional amount in other alcoholic beverages, such as liqueurs and finished wines.
Unlike packaged foods, there is no requirement for a Nutrition Facts label on alcoholic beverages. To get a caloric breakdown for a specific beverage, check with the manufacturer.