A single large egg contains about 72 calories and 6 grams of protein. That compact nutritional package makes eggs one of the most efficient protein sources available, but the exact numbers shift depending on egg size, which part you eat, and how you cook it.
Calories and Protein by Egg Size
Most nutrition labels and recipes assume you’re using a large egg (50 grams), but egg sizes vary quite a bit at the grocery store. Here’s how the calories scale:
- Small (38 g): 54 calories
- Medium (44 g): 63 calories
- Large (50 g): 72 calories, 6 g protein
- Extra-large (56 g): 80 calories
- Jumbo (63 g): 90 calories
Protein scales proportionally with size, so a jumbo egg delivers roughly 25% more protein than a large one. If you’re tracking macros carefully, weighing your eggs is more accurate than counting them, since two “large” eggs from the same carton can differ by several grams.
Yolk vs. White: Where the Nutrients Live
The white and yolk split the protein almost evenly, but the calories are heavily concentrated in the yolk. A single egg white provides about 17 calories and 3.6 grams of protein. The yolk accounts for the remaining 54 or so calories and about 2.7 grams of protein, along with nearly all the fat (roughly 5 grams).
If you’re eating egg whites only to cut calories, you’re saving about 55 calories per egg. That adds up with a three-egg omelet. But you’re also losing more than just calories. The yolk contains the bulk of the egg’s micronutrients, including choline, a nutrient important for brain function and liver health. A whole raw egg provides about 125 mg of choline (based on the USDA’s figure of 250 mg per 100 grams of whole egg), which is roughly a quarter of the daily recommended intake for most adults. The yolk also carries the egg’s vitamin D and B12.
For most people, eating the whole egg is worth it nutritionally unless you’re on a strict calorie budget and need the protein without the extras.
How Cooking Changes the Numbers
A hard-boiled egg clocks in at about 78 calories, just slightly above a raw egg, because nothing is added during cooking. A fried egg jumps to around 90 calories per large egg, and that’s a conservative estimate. The difference comes entirely from the cooking fat. Fry an egg in a tablespoon of butter and you’re adding closer to 100 extra calories on top of the egg itself.
Poaching lands in the same range as boiling since the egg cooks in water. Scrambled eggs depend entirely on what you add. A splash of milk and a pat of butter can push two scrambled eggs well past 200 calories, while scrambling in a nonstick pan with no additions keeps the count close to two boiled eggs.
Protein stays essentially the same regardless of cooking method. You’re not losing or gaining protein by boiling, frying, or scrambling. Research from the University of Illinois found that boiling, frying, and scrambling had no measurable effect on egg protein quality.
Why Egg Protein Is Especially Useful
Not all protein is created equal. The protein in eggs scores at the top of quality scales because it contains every essential amino acid your body needs, and in proportions your body can actually use efficiently. For anyone older than six months, cooked eggs have no limiting amino acid, meaning your body can fully utilize the protein without needing to combine it with another food source. Eggs are rated as “excellent” quality protein by digestibility standards.
That protein quality has a practical effect on hunger. A study published in the Journal of the American College of Nutrition compared an egg breakfast to a bagel breakfast with the same number of calories and the same weight of food. Women who ate the egg breakfast felt fuller afterward and ate significantly less at lunch. The calorie reduction wasn’t small: the egg group consumed roughly 160 fewer calories at the next meal. The effect persisted beyond lunch. Total calorie intake stayed lower for the rest of the day and even into the following day, up to 36 hours after the egg breakfast.
This makes eggs particularly useful if you’re trying to manage your weight. The combination of protein and fat in a whole egg slows digestion and keeps you satisfied longer than carbohydrate-heavy foods with the same calorie count.
Cholesterol: What the Guidelines Say Now
Eggs contain about 186 mg of cholesterol per large egg, all of it in the yolk. For years, dietary guidelines recommended limiting cholesterol to 300 mg per day, which effectively capped egg intake. The current Dietary Guidelines for Americans (2020-2025) take a different approach. They recommend keeping dietary cholesterol “as low as possible without compromising the nutritional adequacy of the diet,” but they don’t set a specific daily number. Eggs are listed as a nutrient-dense protein food alongside lean meats, poultry, and seafood.
For most healthy adults, eating one to three eggs per day doesn’t raise heart disease risk in the way researchers once feared. Dietary cholesterol has a smaller effect on blood cholesterol than saturated and trans fats do. That said, people with existing heart disease or diabetes may want to be more conservative and discuss their intake with a doctor.
Practical Calorie Math for Common Portions
Since most people don’t eat a single egg in isolation, here’s how the numbers add up in typical servings. Two large boiled eggs give you about 156 calories and 12 grams of protein. A three-egg omelet cooked in a teaspoon of oil runs roughly 250 to 280 calories with 18 grams of protein, before you add cheese or vegetables. Four egg whites scrambled in a nonstick pan come to about 68 calories and 14.4 grams of protein, making them one of the leanest high-protein options available.
For context, getting 30 grams of protein from eggs alone (a common per-meal target for muscle maintenance) requires about five large eggs, or roughly 360 calories if boiled. That’s a reasonable calorie cost for that much high-quality protein, comparable to a chicken breast but with more micronutrient variety.