A single large egg white contains about 17 calories. Nearly all of those calories come from protein, with virtually no fat or cholesterol, which is why egg whites are a staple for anyone tracking their intake closely.
Full Nutritional Breakdown
One large egg white provides 3.6 grams of protein and almost nothing else in terms of macronutrients. There’s no meaningful fat, no cholesterol, and less than half a gram of carbohydrate. That 17-calorie count makes egg whites one of the most calorie-efficient protein sources available.
Beyond protein, egg whites deliver small but useful amounts of several micronutrients. A single white contains about 0.14 mg of riboflavin (roughly 11% of the daily value), 6.6 mcg of selenium, and nearly 54 mg of potassium. These aren’t headline numbers, but they add up if you’re eating two or three whites at a time.
Egg White vs. Whole Egg
A whole large egg has 71 calories and 6.3 grams of protein. So removing the yolk cuts your calories by about 75% while keeping more than half the protein. The tradeoff is that the yolk carries most of the egg’s vitamins, calcium, and healthy fats. If your primary goal is keeping calories low while hitting a protein target, whites win. If you want the full nutritional package, the whole egg is more complete.
Egg whites contain no cholesterol at all. The yolk holds roughly 186 mg. For most people, dietary cholesterol has a modest effect on blood cholesterol levels, but those with specific lipid concerns sometimes prefer whites for that reason.
Protein Quality
Egg white protein isn’t just plentiful for its calorie cost. It’s also exceptionally high quality. It scores a perfect 1.0 on the PDCAAS scale, a standardized measure of how well your body can digest and use a protein source. That puts egg whites on the same tier as whey protein and above most plant-based options. The amino acid profile earns a score of 100, matching milk and soy for completeness.
In practical terms, this means the 3.6 grams of protein in a single egg white are highly usable. Your body absorbs and puts nearly all of it to work for muscle repair and other functions, with minimal waste compared to lower-quality protein sources.
Scaling Up for Meals
Most people don’t eat a single egg white on its own. Here’s how the numbers look when you scale up:
- 2 egg whites: 34 calories, 7.2 g protein
- 3 egg whites: 51 calories, 10.8 g protein
- 4 egg whites: 68 calories, 14.4 g protein
Four egg whites give you roughly the same calories as a single whole egg but more than double the protein. A common approach for omelets or scrambles is to combine one whole egg with two or three whites, giving you the flavor and nutrients of the yolk without a large calorie increase.
Liquid egg whites sold in cartons are typically pasteurized, making them convenient for smoothies or high-volume cooking. A standard serving size on the carton (about 46 grams, roughly equivalent to one and a half large egg whites) usually lists around 25 calories and 5 grams of protein, though this varies slightly by brand.
Cooking Methods and Calorie Changes
The 17-calorie figure applies to a raw or boiled egg white. Cooking method matters only if you add fat. Poaching, boiling, or microwaving keeps the calorie count unchanged. Frying egg whites in a teaspoon of butter or oil adds about 30 to 40 calories, nearly tripling the total. Using a nonstick pan with cooking spray keeps added calories negligible.
Heat does not significantly alter the protein content or quality of egg whites. Cooking actually improves protein digestibility compared to eating them raw, so there’s no nutritional reason to consume them uncooked.