A single large egg white contains about 17 to 20 calories, with virtually all of those calories coming from protein. That makes egg whites one of the leanest protein sources available, especially compared to the whole egg, where the yolk alone adds roughly 55 additional calories.
Calories by Egg Size
The calorie count of an egg white depends on the size of the egg, because larger eggs have proportionally more white. The white makes up about 60 to 63 percent of an egg’s total weight, and that percentage actually increases slightly as eggs get bigger. Here’s how the sizes break down:
- Medium egg: The white weighs about 35 grams and contains roughly 14 calories.
- Large egg: The white weighs about 42 grams and contains 17 to 20 calories.
- Extra-large egg: The white weighs about 49 grams and contains roughly 23 calories.
Per 100 grams, egg whites clock in at approximately 47 calories. If you’re using liquid egg whites from a carton, one cup (about 243 grams) contains roughly 115 to 120 calories and around 26 grams of protein.
Macronutrient Breakdown
Egg whites are almost pure protein. A single large egg white delivers about 3.6 grams of protein, zero fat, and less than half a gram of carbohydrate. That protein-to-calorie ratio is hard to beat: you get a meaningful dose of complete protein for fewer than 20 calories.
The protein in egg whites contains all nine essential amino acids your body can’t produce on its own. One large egg white provides about 0.34 grams of leucine, the amino acid most directly responsible for triggering muscle repair and growth. Egg white protein has long been considered a reference standard for protein quality, and it’s one of the reasons bodybuilders and athletes have gravitated toward it for decades.
Egg Whites vs. Whole Eggs
A whole large egg contains about 70 to 75 calories total. The yolk accounts for roughly three-quarters of those calories, plus nearly all the fat (about 5 grams) and cholesterol. If your goal is cutting calories while keeping protein high, swapping whole eggs for whites is one of the simplest trades you can make. Three egg whites give you about 11 grams of protein for only 51 to 60 calories, while a single whole egg provides 6 grams of protein for 72 calories.
That said, the yolk is where most of the micronutrients live: vitamins A, D, E, B12, choline, and iron. Egg whites on their own are nutritionally narrow. A common compromise is combining one whole egg with two or three whites, which keeps the calorie count moderate while still delivering the fat-soluble vitamins from the yolk.
Why Egg Whites Keep You Full
Protein is the most satiating macronutrient, and egg white protein appears to be especially effective at reducing appetite. Research comparing egg white protein to plant-based proteins like wheat gluten found that egg white led to significantly smaller subsequent meals. Animals fed egg white protein ate about 27 percent less at their next meal compared to those fed wheat gluten.
The likely reason involves specific amino acids. Egg white protein produces notably higher blood levels of certain amino acids linked to appetite suppression, including a 60 percent increase in lysine, a 34 percent increase in valine, and a 24 percent increase in tryptophan compared to wheat gluten. These amino acids appear to trigger gut hormones that signal fullness. The appetite-suppressing effect lasted up to about four hours after eating, which aligns well with the gap between meals for most people.
Raw vs. Cooked Egg Whites
If you’re adding raw egg whites to smoothies, you’re losing a significant amount of their protein value. Protein digestion from raw eggs is around 40 percent lower than from cooked eggs. Cooking unfolds the tightly wound protein structures in egg whites, making them far easier for your digestive enzymes to break apart and absorb.
Raw egg whites also contain a protein called avidin, which binds to biotin (vitamin B7) and prevents your body from absorbing it. Cooking deactivates avidin completely. While eating an occasional raw egg white won’t cause problems, regularly consuming large quantities of raw whites could contribute to biotin deficiency over time. For both protein absorption and safety, cooked egg whites are the better choice.
Practical Calorie Counts for Common Servings
Since most people don’t eat a single egg white on its own, here’s how the calories add up in typical servings:
- 3 large egg whites (a standard omelet): 51 to 60 calories, about 11 grams of protein
- 4 large egg whites (scramble): 68 to 80 calories, about 14 grams of protein
- 1 cup liquid egg whites: 115 to 120 calories, about 26 grams of protein
- 1 whole egg + 3 egg whites: roughly 130 calories, about 17 grams of protein
Cooking method matters too, but only because of what you add. Egg whites cooked in a nonstick pan with cooking spray add essentially no extra calories. Cooked in butter or oil, you’re adding 30 to 50 calories per teaspoon of fat. The egg whites themselves don’t change in calorie content when cooked. They just become dramatically better at delivering their protein to your body.