Melon and watermelon have relatively similar calorie values. Watermelon contains about 30 calories per 100 grams, while melon contains around 34–36 calories per 100 grams. Therefore, melon may be slightly higher in calories, but the difference is not dramatic. From a diet perspective, portion size matters more than the fruit itself. Large servings of either melon or watermelon can still increase total energy intake.