Total Carbohydrates. The value for total carbohydrates includes the combined amount of sugars, starches and fiber contained in the food. Adults should consume 130 grams of total carbohydrates daily, according to the Institute of Medicine. One banana has 26.95 grams and an orange has 11.28 grams of total carbohydrates. These values are for a medium banana that’s about 7 inches long and weighs 118 grams, and a small orange that’s about 2 inches in diameter and weighs 96 grams.