A single grape contains 0.9 gram of carbohydrates. A standard 1-cup serving of raw grapes, about 5.3 ounces in weight, contains 23.7 grams of carbohydrates.
Whether red, green or raw, a grape is about three calories, and the standard serving of 1 cup of grapes contains about 104 calories. Carbohydrates make up about 9 percent of a typical serving of grapes. These carbohydrates are mostly sugar.
A serving of grapes contains about 1.5 percent of the daily needed amount of dietary fiber. Grapes contain virtually no fat – just 0.2 gram per serving – and only minimal amounts of calcium and potassium.