It all depends on your glass. The caloric intake of an alcoholic beverage depends on its alcohol content, the amount of sugar it contains and, of course, the quantity you drink! A gram of alcohol provides 7 Kcal (calories) while a gram of carbohydrate (sugar) provides 4 Kcal.
A 150 ml glass of standard wine with an alcohol content of 11.5% represents approximately 120 Kcal (calories). Although beer has lower alcohol content than wine - approximately 5% - it doesn't have less calories. In fact, beer contains more carbohydrates, as much as six times more than wine. A beer bottle of 340 ml represents a caloric intake of about 150 Kcal (calories).
That is why moderation has much better taste — for safety reasons as well as for the waist line!