One gram of alcohol contains 7 calories (kcal) of energy. Five bottles of medium strength beer contain the same amount of calories as approximately 100 g of butter.
On average, one unit of alcohol contains the following amount of energy:
One bottle (0.33 l) of medium strength beer contains 140 kcal of energy
One bottle (0.33 l) of sweet cider contains 168 kcal of energy
A restaurant portion (12 cl) of wine contains 81 kcal of energy
A restaurant portion (4 cl) of strong alcohol contains 91 kcal of energy