1 cup or 256g raw soybeans usually contain about 376 calories, 33.2 g protein, 28.3 g carbohydrates, 17.4 g fats, 74.2 mg vitamin C, 1.1 mg thiamine, 504 mg calcium, 166 mg magnesium, 1587 mg potassium, and 9.1 mg iron. On the other hand, 172 gm dry and roasted mature seeds contain almost 776 calories.