In a cup of raw green grapes, there are 104 calories, according to the United States Department of Agriculture. A cup of green grapes is approximately 151 grams. In one serving of a cup, there are 27.33 grams of carbohydrates, 23.37 grams and 1.09 grams of protein.
Water and fiber are other nutrients found in green grapes. This serving of grapes also are sources of certain vitamins and minerals, such as vitamins A and C, potassium, calcium and phosphorus. For example, there are 4.8 milligrams of vitamin C and 288 milligrams of potassium in this portion size of fruit.
The same serving size of raw red grapes also contains the same amounts of each of these different nutrients.