The number of carbohydrate calories you require depends on your body's food requirements to sustain basic bodily function, activities of daily living, and how active you are. According to MayoClinic.com, daily carbohydrate diet requirements are between 225 and 325 grams. Since carbohydrates have four calories per gram, this means that you need between 900 and 1,300 daily carbohydrate calories on a 2,000 calorie diet.