One-half of a cup of chopped celery or one medium celery rib contains 2 grams of carbohydrates, one of which is fiber. This means that ½ cup or one rib has only 1 gram of effective carbohydrates, which the body uses for energy.
Celery is a low-carbohydrate, low-calorie food. It is a good source of fiber, vitamin K, vitamin A and potassium, and it has trace amounts of vitamin C and other nutrients. Celery is an appropriate accompaniment to high-protein dips and an acceptable low-calorie, crunchy snack for those who are watching their carbohydrate intake. One-half of a cup of chopped celery has approximately eight calories.