A McDonald's Big Mac contains approximately between 540 and 580 calories, with most reliable sources converging around 560-564 calories. Specifically:

• McDonald's official US nutrition page lists it at 580 calories

• Several nutrition trackers and analyses report values around 540 to 564 calories, such as 540 calories

, 550 calories

, 563 calories

• The fat content is roughly 30-34 grams, carbohydrates about 44-46 grams, and protein around 25-26 grams

Thus, the Big Mac generally contains about 560 calories on average, depending on the source and slight regional recipe variations.