Alcohol Calories Calculator
Alcoholic beverages contribute calories from two sources: ethanol (7 kcal per gram, per the Atwater factor used by the FDA) and carbohydrates such as residual sugars from brewing or added mixers (4 kcal per gram). Many people underestimate how many calories are in alcohol because standard nutrition labels were not historically required for alcohol in the US. This calculator estimates total calories from a drink based on its volume, alcohol by volume (ABV) percentage, and carbohydrate content. The ethanol mass is calculated from volume, ABV, and the density of ethanol (0.789 g/mL), then multiplied by 7. Add carbohydrate calories for the full picture.
Alcohol calorie formula
Ethanol (g) = Volume (mL) * ABV/100 * 0.789
Ethanol kcal = Ethanol (g) * 7
Carb kcal = Carbs (g) * 4
Total kcal = Ethanol kcal + Carb kcal
Ethanol density is 0.789 g/mL. The Atwater factor for ethanol is 7 kcal/g. Carbohydrates provide 4 kcal/g. These are the values used on FDA nutrition labels.
Typical drink calorie reference
- 12 oz regular beer (5% ABV, 13 g carbs): approximately 150 kcal total.
- 5 oz wine (12% ABV, 4 g carbs): approximately 122 kcal total.
- 1.5 oz 80-proof spirits (40% ABV, 0 g carbs): approximately 97 kcal from ethanol.
- 12 oz light beer (4.2% ABV, 5 g carbs): approximately 103 kcal total.
- Cocktails with juices or syrups can easily double or triple the calorie count of the spirits alone.
Alcohol calories calculator: frequently asked questions
How many calories are in alcohol (ethanol)?
Pure ethanol provides 7 kilocalories per gram, which is the Atwater factor used by the FDA on nutrition labels. This is more than carbohydrates or protein (4 kcal/g) but less than fat (9 kcal/g). Alcohol is unique in that these calories are not stored as body fat in the same way but must be metabolised first, affecting fat burning.
How is the calorie content of a drink calculated?
Total alcohol calories = volume (mL) * 0.789 (ethanol density g/mL) * ABV/100 * 7. Carbohydrate calories are added separately: carbs (g) * 4. A standard 12-oz (355 mL) beer at 5% ABV has about 14 g of ethanol, yielding approximately 98 kcal from alcohol alone.
Do cocktails and mixers add extra calories?
Yes. Mixers such as juice, regular soda, syrups, cream, and simple syrup add significant carbohydrate and sometimes fat calories on top of the alcohol calories. A standard margarita can easily contain 200-300 kcal, with roughly half from the mixer.
What is a standard drink in the US?
A US standard drink contains 14 g of pure alcohol, equivalent to 12 oz of regular beer (5% ABV), 5 oz of wine (12% ABV), or 1.5 oz of 80-proof spirits (40% ABV). These all provide approximately 98-100 kcal from ethanol alone.
Does alcohol affect weight loss?
Yes. The body prioritises ethanol metabolism over fat burning because ethanol is a toxin. While alcohol is being processed, fat oxidation is suppressed. Additionally, alcohol can stimulate appetite and lower inhibitions around food choices, increasing total calorie intake.
Official sources
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.