Here is the translation for calories on food packaging:Calorie free:   Fewer than 5 calories per servingLow calorie:  40 calories or less per serving.  If a serving is 30 grams or less or 2 tablespoons or less, it signifies 40 calories per 50 g of the foodReduced or fewer calories:  At least 25 percent fewer calories per serving than the reference foodThat means you can say something is "reduced in calories" if there are 25% fewer calories, but the food can still be very high calories.  75% of a big amount is still a big amount  (Source: The Doctor Weighs In)