Nutrition Facts. According to the Household USDA Foods Fact Sheet, one cup of cooked black eyed peas contains 198 calories, 1 gram of fat, 36 grams of carbohydrates and 14 grams of protein. One serving, or one-half cup, contains 99 calories, 0 grams of fat, 18 grams of carbohydrates and 7 grams of protein. Black eyed peas are also an excellent source of fiber. One cup contains 12 grams, and one serving contains 6 grams.