The calorie count in fast food varies by menu item and additional toppings or sauces; for example, a Big Mac from McDonald's has 550 calories, while a Whopper from Burger King has 660 calories. The Jumbo Jack from Jack in the Box has 489 calories.
Fast food salad options, including Wendy's mandarin chicken salad with 170 calories and the premium Southwest chicken salad from McDonald's with 368 calories, generally have lower calorie counts, but only without dressing or toppings. Dressing, croutons and other items add to the calorie counts of salads. CalorieCount.com offers a list of nutritional values for common and popular fast food items.