Learn how many calories are in a mango fruit. A medium mango fruit has 135 calories; a cup of sliced mango, 107 calories. An average mango weighs about 200 grams. Mango is made up primary of carbohydrates: the mango fruit provides 35.2 grams of carbohydrates including 3.7 grams of dietary fiber and 30.6 grams of sugar.