One large egg white contains about 17 to 20 calories. Nearly all of those calories come from protein, with virtually no fat or cholesterol. That makes egg whites one of the leanest protein sources available in any kitchen.
Calorie and Protein Breakdown
A single large egg white provides 3.6 grams of protein and zero grams of fat. For context, the whole egg clocks in at about 71 calories and 6.3 grams of protein, meaning the yolk accounts for roughly 50 calories on its own. If you’re tracking macros, egg whites are almost pure protein: over 85% of their calories come from it, with a small amount from naturally occurring carbohydrates.
Egg whites also contain 0.335 grams of leucine each, the amino acid most directly involved in triggering muscle repair after exercise. While that’s a modest amount per egg, stacking three or four whites in a meal gets you into a range that meaningfully supports recovery.
How Egg Size Changes the Count
Most nutrition labels and recipes assume a “large” egg, which is the USDA standard. Medium eggs yield a slightly smaller white (closer to 14 to 15 calories), while extra-large and jumbo eggs push closer to 20 to 25 calories per white. The differences are small individually but add up if you’re using several at once. One cup of egg whites takes about 7 large eggs and contains roughly 120 to 140 calories.
Liquid Egg Whites From a Carton
Commercial liquid egg whites, like the kind sold in cartons, are pasteurized and ready to pour. A standard 3-tablespoon serving (46 grams, roughly equivalent to one egg white) contains about 25 calories and 5 grams of protein. The slightly higher numbers compared to cracking your own egg come from minor processing differences and the fact that carton servings are sometimes a touch larger than a single egg white.
These cartons are convenient for baking and cooking since you skip the separation step, and they’re shelf-stable longer than fresh eggs once opened (typically 3 to 5 days in the fridge).
What Nutrients You Lose Without the Yolk
Egg whites are nutritionally simple by design. They contain small amounts of potassium (about 54 mg), selenium (6 mcg), riboflavin (0.13 mg), and magnesium (3.6 mg). But they have essentially zero vitamin A, zero vitamin D, and less than 1 mg of choline, a nutrient important for brain and liver function.
All of those missing nutrients live in the yolk, along with the egg’s calcium, iron, folate, and B12. The yolk also carries all 4.5 grams of fat and 180 milligrams of cholesterol found in a whole egg. So the tradeoff is straightforward: egg whites give you a very low-calorie protein hit, but you’re leaving most of the egg’s micronutrient value behind.
How Cooking Changes the Calories
Plain egg whites, whether boiled, poached, or cooked in a nonstick pan with no added fat, stay right around 17 to 20 calories each. The calorie count only changes when you add something to the pan. A teaspoon of butter adds about 34 calories. A teaspoon of olive oil adds roughly 40. Scrambled egg whites made with milk and butter can easily double or triple the calorie total depending on how generous you are with each.
If keeping calories low is the goal, poaching or using a light spritz of cooking spray in a nonstick skillet are your best options. The protein and nutrient content stays the same regardless of cooking method.
Egg Whites for Weight Management
The appeal of egg whites for weight loss is simple math: you get a solid amount of protein for very few calories. Three large egg whites deliver about 11 grams of protein for only 50 to 60 calories. That same protein from a whole egg would cost you over 200 calories.
Protein in general is the most filling macronutrient, and egg white protein (albumin) is highly digestible. However, a study published in the American Journal of Clinical Nutrition compared egg albumin to five other protein sources and found no difference in how full people felt when the protein was part of a mixed meal containing carbohydrates and fat. In other words, egg whites aren’t magically more filling than other proteins. Their advantage is caloric efficiency, not some special satiety effect.
Common Kitchen Conversions
- 1 large egg white: about 2 tablespoons (30 ml)
- 1/2 cup egg whites: 4 to 6 large eggs
- 1 cup egg whites: 7 large eggs, roughly 120 to 140 calories
These conversions are useful when a recipe calls for egg whites by volume rather than by count, which is common in meringues, angel food cake, and protein-focused meal prep.