How much protein in egg whites?

Here is how much protein is in egg whites, according to data from the USDA [1]: 

• 1 large (33 g) egg: 3.6 g of protein from egg whites

• 1 cup (220 g) of egg whites: 26 g of protein 

While egg whites are a great source of quality protein, yolks actually contain more protein by weight and make up nearly half of the protein in an egg [1]. In addition to being a good source of protein, the yolk contains other important nutrients, including essential fatty acids, vitamins A, D, B12, and folate, as well as calcium, phosphorus, and iodine.