A single large egg white contains about 17 calories. That’s roughly a quarter of the 71 calories in a whole egg, since the yolk carries the majority of the fat and energy. For anyone tracking calories while trying to keep protein intake high, egg whites are one of the most efficient foods available.
Full Nutritional Profile
Those 17 calories come almost entirely from protein. A single large egg white (about 34 grams) delivers 3.6 grams of protein with virtually zero fat and zero cholesterol. A whole egg, by comparison, provides 6.3 grams of protein and 71 calories. So the white holds more than half the egg’s protein while contributing less than a quarter of its calories.
Egg whites also supply some useful micronutrients. One white provides about 11% of your daily value for riboflavin (vitamin B2), which your body uses to convert food into energy, and 8% of your daily selenium, a mineral involved in thyroid function and immune defense. Beyond that, egg whites are nutritionally sparse. The yolk is where you’ll find iron, vitamin D, vitamin A, choline, and healthy fats.
Calorie Counts by Egg Size
The 17-calorie figure applies to a large egg, which is the standard size used on nutrition labels in the United States. Smaller eggs produce smaller whites with fewer calories, and jumbo eggs produce larger whites with slightly more. As a rough guide, expect about 14 calories from a medium egg white and around 20 from a jumbo. The differences are small, but they add up if you’re making a four- or five-white omelet.
Fresh Whites vs. Carton Whites
Liquid egg whites sold in cartons are nutritionally similar to the whites you’d separate at home. The calorie and protein content is essentially the same. The main difference is that carton products always contain some type of preservative to extend shelf life and maintain consistency. Some brands also add thickeners or flavor agents. If you go the carton route, check the ingredient list and look for products where egg whites are the only ingredient, or close to it.
Cartons are convenient for cooking in volume, since separating a dozen eggs by hand is tedious and wastes the yolks unless you have a use for them. Nutritionally, though, you’re getting the same thing.
Why Cooking Matters
Your body absorbs protein from cooked egg whites far more efficiently than from raw ones. Cooking unfolds the protein molecules, making them easier to break down during digestion. Raw egg whites also contain a protein called avidin that binds tightly to biotin (vitamin B7) in your digestive tract, preventing absorption. The bond between avidin and biotin is essentially irreversible, so the biotin passes through your body unused. Heat denatures avidin and eliminates this effect entirely, so cooked egg whites pose no risk to your biotin levels. Eating raw egg whites regularly, on the other hand, can lead to biotin deficiency over time.
How Egg Whites Fit Into a High-Protein Diet
The ratio that makes egg whites appealing is hard to beat: 3.6 grams of protein for 17 calories. That works out to roughly 85% of the calories coming from protein. For context, a skinless chicken breast gets about 75% of its calories from protein, and Greek yogurt sits around 55 to 65% depending on the brand.
Three large egg whites give you nearly 11 grams of protein for just 51 calories. Combine those with one whole egg (71 calories, 6.3 grams of protein) and you have a 122-calorie meal with over 17 grams of protein. That blend gives you the volume and protein of whites with the flavor, fat, and micronutrients the yolk provides.
Egg whites are a complete protein, meaning they contain all nine essential amino acids your body can’t produce on its own. They’re particularly rich in leucine, the amino acid most directly involved in stimulating muscle repair after exercise. This makes them a staple for athletes and anyone focused on body composition, not just because they’re low-calorie but because the protein quality is high.