Per cup, black beans have 227 calories, 40.8 grams of carbs, 15.2 grams of protein, and .9 grams of fat, while pinto beans have 245 calories, 44.4 grams of carbs, 15.4 grams of protein, and 1.11 grams of fat. Although,if you’re getting your beans pre-cooked or in a can, check the labels for any additives.