How Many Calories in an Egg? Full Nutrition Breakdown

A large chicken egg contains about 72 calories, with roughly 60 of those coming from the yolk and the remaining 12 or so from the white. That calorie count shifts depending on egg size, cooking method, and what you add to the pan, but the plain egg itself is a remarkably nutrient-dense package for fewer than 80 calories. What makes eggs interesting from a nutrition standpoint goes well beyond their calorie content: they deliver high-quality protein, a wide range of vitamins and minerals, and several compounds that are hard to get in adequate amounts from other common foods.

Calories by Size and by Part

Egg sizes are standardized by weight per dozen. A medium egg (about 44 grams) runs closer to 63 calories, a large egg (about 50 grams) sits around 72, an extra-large (about 56 grams) hits roughly 80, and a jumbo (about 63 grams) approaches 90. Almost all published nutrition data and recipes use the large egg as the reference.

The yolk and white have very different nutritional profiles. A single large egg white contains about 17 calories, almost entirely from protein (around 3.6 grams), with negligible fat and no cholesterol. The yolk, by contrast, packs about 55 calories, roughly 4.5 grams of fat, 2.7 grams of protein, and about 186 milligrams of cholesterol. The yolk also houses nearly all of the egg’s vitamins and minerals, along with the fat-soluble nutrients that make eggs distinctive.

Macronutrient Profile of a Whole Egg

A large egg delivers about 6.3 grams of total protein, 4.8 grams of fat (roughly 1.6 grams saturated, with the rest split between monounsaturated and polyunsaturated), and less than half a gram of carbohydrate. The protein is considered among the highest quality available from food. Egg protein has long been used as a reference standard for evaluating other protein sources because of its amino acid completeness and balance.

One underappreciated detail: cooking matters for how much of that protein your body actually absorbs. A study using isotope-tracing techniques found that the true digestibility of cooked egg protein was about 91%, compared with only about 51% for raw egg protein.¹ In practical terms, eating a cooked egg gives your body access to nearly twice as much usable protein as eating a raw one. A more recent trial with young men found that boiled eggs produced about 20% higher peak levels of essential amino acids in the blood compared with raw eggs, though muscle protein synthesis rates after exercise were similar between the two groups.² So the Rocky training montage was not the best nutritional strategy.

Vitamins, Minerals, and the Nutrients You Might Be Missing

Eggs are one of the few foods that naturally contain vitamin D, providing about 41 IU per large egg (roughly 6-7% of a typical daily target). They also supply meaningful amounts of B12, riboflavin (B2), selenium, phosphorus, and vitamin A. But the nutrient that sets eggs apart from most other common foods is choline.

A single large egg yolk contains about 147 milligrams of choline, making eggs the most concentrated common dietary source of this nutrient. Choline is essential for liver function, nerve signaling, and brain development. Most adults do not consume enough of it. Research involving children and adolescents has found that those who eat eggs have higher daily intakes of choline, along with protein, vitamin D, selenium, lutein, zeaxanthin, and omega-3 fatty acids like DHA compared to non-egg-eaters.³

The yolk’s yellow-orange color comes from carotenoids, particularly lutein and zeaxanthin, which are associated with eye health. While dark green leafy vegetables contain higher absolute amounts of these compounds, egg yolks are considered a highly bioavailable source, meaning the body absorbs and uses them efficiently.⁴ The fat in the yolk likely helps with absorption, since these carotenoids are fat-soluble.

Choline and Brain Function

The choline story deserves its own space because most people have never heard of it. Adequate intake is set at 550 milligrams per day for men and 425 milligrams for women, and surveys consistently show that the majority of people fall short. Two eggs at breakfast get you more than halfway to the daily target.

A randomized, placebo-controlled trial in healthy middle-aged and older Japanese adults found that supplementing with egg yolk-derived choline led to improved verbal memory scores and higher plasma choline levels compared with a placebo group over 6 to 12 weeks.⁵ That is a single study in a specific population, so the results should be taken as suggestive rather than definitive, but they align with the broader understanding that choline plays a structural role in the brain and that many people get too little of it.

How Cooking Changes Calories and Nutrition

A plain boiled or poached egg has essentially the same calorie count as a raw one, because you are not adding anything. The moment you introduce fat to a pan, the numbers shift. A fried egg cooked in a tablespoon of butter adds roughly 100 calories. Scrambled eggs made with butter and milk can easily double the per-egg calorie count. The calorie difference between cooking methods comes almost entirely from added ingredients, not from changes in the egg itself.

On the lipid side, research has shown that when you fry or scramble eggs in oil or butter, the egg absorbs a considerable amount of that cooking fat, and the final fatty acid profile of the egg essentially reflects whatever fat was used for cooking.⁶ In other words, frying an egg in olive oil produces a different fat composition than frying it in butter, and the egg takes on the profile of whichever fat you choose. The rapid cooking time of eggs, though, means the fats in the egg and the cooking oil do not undergo significant degradation or oxidation under normal kitchen conditions.

Higher temperatures and longer cooking times do produce cholesterol oxidation products, sometimes called oxysterols, which are a concern separate from cholesterol itself. Research on egg-containing food systems has confirmed that the extent of cholesterol oxidation is closely related to both temperature and the lipid environment of the food.⁷ Frying at high heat produces more of these oxidation products than gentle boiling or poaching.⁸ The practical takeaway: softer cooking methods preserve more of the egg’s nutritional quality.

Whole Eggs Versus Egg Whites for Muscle Building

If you are eating eggs for their protein, you might assume that egg whites are the better choice, since they deliver protein with barely any fat or calories. The research suggests otherwise. A study in young men found that eating whole eggs after resistance exercise produced a greater muscle protein synthesis response than eating an equivalent amount of protein from egg whites alone.⁹ Follow-up work showed this was related to the yolk’s ability to activate specific signaling pathways involved in muscle repair.¹⁰

The exact components in the yolk responsible for this boost are not fully pinned down, but the fat, micronutrients, and phospholipids in the yolk are strong candidates. For someone focused purely on calorie restriction, egg whites still make sense as a lean protein source. But if you are trying to maximize muscle recovery and can accommodate the extra 55 calories per yolk, the whole egg appears to be more effective.

Eggs and Satiety

Eggs have a reputation as a filling breakfast food, and multiple controlled trials support this. In overweight and obese adults, an egg breakfast led to significantly lower energy intake at a subsequent lunch compared with a cereal breakfast matched for calories, and hunger ratings were lower after the eggs as well.¹¹ Another trial in adult men found that an egg breakfast suppressed the hunger hormone ghrelin and reduced total energy intake over the following 24 hours compared with a calorie-matched bagel breakfast.¹²

One caveat: a trial comparing egg-based and cereal-based breakfasts in people with type 2 diabetes found that the satiety advantage of eggs was strong on day 1 but had largely faded by day 7, suggesting some adaptation.¹³ The combination of protein and fat in eggs likely drives the initial satiety effect, but your body may adjust to a habitual breakfast over time.

The Cholesterol Question

For decades, eggs were treated as something to limit because of their cholesterol content. The American Heart Association’s 1968 recommendation to consume fewer than 300 milligrams of dietary cholesterol per day effectively put eggs on a restricted list, since a single yolk contains about 186 milligrams. That limit was dropped by most health agencies around 2015 as evidence accumulated that dietary cholesterol has a more modest effect on blood cholesterol than was previously assumed.¹⁴

That does not mean the story is completely settled. A large meta-analysis of randomized controlled trials found that people who consumed more eggs did end up with modestly higher LDL cholesterol compared with control groups, and the effect appeared to grow with longer consumption periods.¹⁵ However, people vary in how strongly they respond to dietary cholesterol. Research in older adults found that so-called “hyper-responders” showed increases in both LDL and HDL cholesterol when eating eggs, but their LDL particles shifted toward a larger, less harmful size, and total particle numbers did not change.¹⁶ “Hypo-responders,” meanwhile, saw no significant change at all.

As for actual cardiovascular outcomes, a dose-response meta-analysis of egg consumption and stroke risk found no significant association overall, though there was a suggestion of a J-shaped curve: one to four eggs per week was associated with slightly reduced stroke risk, while more than six per week was associated with a slight increase.¹⁷ A recent review of studies on cardiovascular mortality found that five out of six publications reported a higher risk of cardiovascular death with the highest egg intake compared with the lowest.¹⁸ And a study specifically in stroke survivors found that consuming more than one egg per day was associated with a 40% increased risk of all-cause mortality, though the relationship with cardiovascular mortality specifically did not reach statistical significance.¹⁹

The honest read on the evidence: for most healthy people, an egg or two a day is unlikely to cause problems. High consumption, particularly above six or seven per week, starts to enter territory where the data get murkier, especially for people who already have cardiovascular risk factors.

Pasture-Raised Versus Conventional Eggs

A pasture-raised egg and a conventional cage-free egg contain roughly the same number of calories and grams of protein. The differences show up in the fat profile and micronutrient content. A study comparing pasture-raised eggs to cage-free eggs found that the pasture-raised eggs had about twice the carotenoid content, three times the omega-3 fatty acids, and a dramatically lower omega-6-to-omega-3 ratio.²⁰ The deeper orange yolk color you see in pasture-raised eggs is a direct reflection of higher carotenoid levels from the hens’ more varied diet.

Hen diet can also be modified deliberately. Supplementing hen feed with flaxseed or fish oil has been shown to significantly increase the omega-3 content of the resulting eggs.²¹ This is how “omega-3 enriched” eggs on supermarket shelves are produced. They cost more than standard eggs but less than most other concentrated sources of omega-3s.

How Duck and Quail Eggs Compare

Chicken eggs are the global default, but duck and quail eggs show up in many cuisines. A comparative analysis found that duck and quail eggs both contain more protein per 100 grams than chicken eggs: roughly 15 grams for duck and quail versus about 13 grams for chicken. Fat content was similar across all three (around 13 grams per 100 grams). The big difference was cholesterol: duck eggs contained about 537 milligrams per 100 grams, quail eggs about 423 milligrams, and chicken eggs about 374 milligrams.²² Duck eggs are also physically larger than chicken eggs, so a single duck egg delivers more total calories and nutrients, while a quail egg, being much smaller, delivers proportionally less per individual egg.

Mineral content was slightly higher in both duck and quail eggs compared to chicken eggs. If you are cooking with duck eggs, expect a richer yolk and a slightly different baking performance due to the higher fat-to-protein ratio.

Egg Allergies and the Role of Cooking

Egg allergy is one of the most common food allergies in children, with the main culprits being two proteins in the white: ovalbumin and ovomucoid. An interesting wrinkle is that many children who react to lightly cooked eggs can tolerate baked eggs without problems. Research has shown that high-temperature cooking denatures egg white proteins in ways that reduce their ability to trigger immune responses. In mice, heated ovalbumin and ovomucoid did not cause allergic symptoms when administered orally, even though heating did not entirely eliminate the capacity of those proteins to bind allergy-related antibodies.²³ Digestion further reduced their allergenic potential.

Human cell studies have confirmed that heat-denatured egg proteins shift the immune response away from the allergic pattern and toward a tolerant one, with decreased histamine release from mast cells.²⁴ The temperature and duration of heating matter, and the presence of a wheat matrix (as in a muffin) also affects how the proteins break down.²⁵ This is why allergists sometimes introduce baked goods containing egg as part of oral immunotherapy protocols, gradually building tolerance before advancing to less thoroughly cooked forms.

Storing Eggs Without Losing Nutrition

Fresh eggs kept refrigerated maintain their nutritional quality well. Research on liquid egg yolk found that cold storage had no significant effects on protein solubility or overall composition.²⁶ Hard-boiled eggs are a different story depending on how you store them. A study evaluating hard-boiled eggs at room temperature, refrigerator temperature, and freezer temperature found that refrigeration at 4°C kept eggs structurally and chemically stable for up to 48 hours, while room temperature and freezing both caused quality changes, with freezing making the whites noticeably harder due to ice crystal formation.²⁷ If you meal-prep hard-boiled eggs, the refrigerator is the clear winner over both the counter and the freezer.