How Much Protein in an Egg: 6.3 Grams per Large Egg, Yolk vs White, and Why Grade and Size Change the Count

A large egg sold in the United States carries about 6.3 grams of protein, all of it inside the shell, and almost all of that figure is unaffected by how you cook it. Size is what moves the number: a small egg holds roughly 4.8 grams, a jumbo closer to 8. The split between white and yolk is roughly 3.6 grams and 2.7 grams respectively, which surprises people who assume the yolk is where the protein lives.

A Large Egg Delivers 6.3 Grams of Protein, and the USDA Sets That Mark

The 6.3-gram figure traces to the U.S. Department of Agriculture's FoodData Central database, which lists one large raw egg, yolk and white together, at 6.28 grams of protein per 50-gram serving. That's the number nutrition labels and diet apps build on. It's also the number you'll see in most clinical dietetics materials, because the USDA's Nutrient Database for Standard Reference has carried it for decades.

That 50-gram serving is not a guess. The USDA grades eggs by weight per dozen, and a dozen large eggs must weigh at least 24 ounces, which works out to roughly 50 grams per egg in the shell. The edible portion, shell removed, lands near 43 to 44 grams. So when you see "one large egg," picture about 44 grams of actual food yielding just over 6 grams of protein.

Nutrition panels round. A carton may declare "6 g" per egg, and that's a legal rounding of 6.28, not a different measurement. If you're tracking macros tightly, the unrounded 6.3 is the better planning figure. Over a week of one egg per day the rounding gap is about 2 grams of protein, small but real.

The World Health Organization's protein quality scoring gives eggs a perfect digestibility-corrected amino acid score, commonly abbreviated PDCAAS, of 1.00. That means the protein is fully digestible and supplies every essential amino acid in the proportions humans need. A gram of egg protein does more work than a gram of many plant proteins, which typically score between 0.5 and 0.9 depending on the source and preparation.

Size Weighs More Than Anything Else on Your Carton

Egg sizes in the U.S. are set by the USDA's Agricultural Marketing Service and defined by minimum weight per dozen, not by volume or appearance. A carton labeled large must average 24 ounces per dozen; mediums average 21 ounces; jumbos 30 ounces. From those weights you can compute protein per egg with reasonable confidence, because the ratio of protein to edible mass is fairly constant.

Here's the practical table, built from USDA weight classes and the 6.28-gram-per-50-gram raw ratio. Edible mass is roughly 87 percent of in-shell weight for a fresh egg.

Notice that a large egg's in-shell weight of about 57 grams is heavier than the 50-gram reference serving, which is why the protein figure is 6.3 grams rather than 6.28 applied literally. The reference serving measures edible content; the grade measures the whole shell-on egg. That distinction trips up people comparing cartons to nutrition apps.

Buying extra large or jumbo to "get more protein per egg" works arithmetically but rarely saves money. Retail pricing usually scales with size, and the cost per gram of protein lands close to identical across grades. Medium eggs sometimes carry a small per-gram premium, which is why budget shoppers who crack six eggs into an omelet should check the unit price rather than the carton grade.

The White Carries 3.6 Grams and the Yolk 2.7, Which Inverts Most People's Assumption

Split a large egg and the protein divides unevenly. The white, which is mostly water and ovalbumin, delivers about 3.6 grams. The yolk contributes about 2.7 grams. Anyone who has been discarding yolks to cut fat has also been discarding roughly 43 percent of the egg's protein, along with nearly all of its choline, vitamin D, and lutein.

The yolk's protein sits in lipoproteins and phosvitin, and it's bound up with the fat that gives yolk its richness. That's why yolk protein digests slightly more slowly than white protein, though the total absorbed amount is the same. The white's ovalbumin is a glycoprotein that denatures readily with heat, which is why a fried white turns opaque before the yolk sets.

Here's the split for common sizes, computed from the USDA ratio with whites at roughly 66 percent of edible mass and yolks at 34 percent.

Liquid egg products sold in cartons follow the same math. A quarter cup of liquid egg whites, about 61 grams, delivers roughly 3.6 grams of protein, matching the white of one large egg. Carton egg substitutes that blend whites with coloring and gums vary; read the panel, because some dilute the protein with water and thickeners and land near 3 grams per quarter cup.

Raw, Boiled, Fried, or Scrambled: Cooking Barely Touches the Count

Heat changes protein structure, not protein quantity. A boiled large egg and a raw one both contain about 6.3 grams. What heat does change is digestibility, and the direction is not what raw-food enthusiasts claim. Raw egg whites contain avidin, a protein that binds biotin, and raw whites are only about 51 to 91 percent digestible depending on the study. Cooked egg protein is absorbed at roughly 91 percent, according to research published in the Journal of Nutrition in 1998 by Evenepoel and colleagues using labeled egg protein.

So a boiled egg doesn't lose protein, but your body extracts more of it than from a raw egg. Cooking also deactivates avidin, which is why eating raw egg whites regularly can contribute to biotin deficiency over time. The practical takeaway: cook your eggs and count the same 6.3 grams.

Cooking method affects water content, which changes weight but not protein grams. A hard-boiled egg weighs slightly less than a raw one because moisture escapes through the shell during boiling, yet the protein total is unchanged. Scrambled eggs cooked with milk add protein from the dairy; two large eggs scrambled with two tablespoons of whole milk add about 0.5 grams. Fried in butter, the egg gains fat calories but no protein.

One edge case deserves attention. Egg whites whipped into meringue and baked lose water aggressively, so a meringue cookie made from one white weighs a fraction of the raw white but still carries the full 3.6 grams of protein. Weighing cooked egg dishes to estimate protein will undershoot unless you account for moisture loss, which can run 15 to 25 percent for a hard-cooked yolk.

Grade A Versus Grade AA Is a Freshness Label, Not a Protein Label

Egg grades, printed inside the USDA shield on the carton, describe interior quality and shell condition. Grade AA eggs have thick, firm whites and high, round yolks; Grade A eggs have reasonably firm whites; Grade B eggs are fine for scrambling but spread thin when fried. None of these grades changes the protein content, because grade measures freshness and albumen quality, not composition.

What genuinely varies is feed. Hens fed flaxseed or a diet enriched with omega-3 sources produce eggs with higher omega-3 fatty acid content, and pasture-raised hens' eggs often show higher vitamin D and carotenoid levels. Protein per egg stays close to 6.3 grams for large eggs across all these production systems, because the hen's protein output is biologically constrained. A 2010 study in Renewable Agriculture and Food Systems by Karsten and colleagues found pasture-raised eggs averaged slightly higher total fat and lower cholesterol than caged, but protein differences were within measurement noise.

Shell color is irrelevant to protein. Brown, white, and blue-green eggs come from different hen breeds, and a brown large egg carries the same 6.3 grams as a white one. Organic certification governs feed and husbandry, not nutrient density in any measurable protein sense.

If you want to verify a specific carton, the Nutrition Facts panel is the controlling document, and it must follow FDA labeling rules for the serving size stated. A carton claiming "7 grams per egg" on a large-egg product would be out of step with USDA reference data and worth a second look at the serving definition.

Build a Daily Target From Eggs Using Simple Arithmetic

Protein needs scale with body weight and activity. The Institute of Medicine's acceptable macronutrient distribution range sets protein at 10 to 35 percent of calories, and the recommended dietary allowance sits at 0.8 grams per kilogram of body weight for sedentary adults. A 70-kilogram adult following that baseline needs 56 grams daily, which is about nine large eggs if eggs were the only source.

Athletes and older adults often aim higher. Research on resistance-trained individuals and on adults over 65 supports 1.2 to 1.6 grams per kilogram, per position stands from the American College of Sports Medicine and the PROT-AGE study group. For a 70-kilogram active adult at 1.4 grams per kilogram, that's 98 grams daily, or roughly 15.5 large eggs. Nobody eats that many eggs alone, which is why the arithmetic matters: eggs are a contributor, not a sole source.

A worked example makes it concrete. Breakfast of two large eggs plus a half cup of cooked oatmeal (about 3 grams from the oats) lands near 15.6 grams. Add a cup of Greek yogurt at lunch for 17 grams and a 100-gram chicken breast at dinner for 31 grams, and you're at roughly 63.6 grams before snacks. Hitting 98 grams requires another 34 grams, which is where a protein shake or a second serving of meat fits.

Eggs are cheap protein per gram in most U.S. markets. When a dozen large eggs is priced at a given figure, dividing by 12 gives cost per egg, and dividing again by 6.3 gives cost per gram of protein. That calculation is the fair comparison against chicken, beans, or whey, and it shifts with regional prices and seasonal demand, so run it against your own receipt rather than a remembered figure.

Hard-Boiled Eggs Keep Their Protein for a Week, With One Catch

A hard-cooked egg stored in its shell in a refrigerator holding 40°F or below keeps for about one week, per USDA FoodSafety.gov guidance. The protein doesn't degrade in that window. What degrades is texture and, if the shell cracks, safety: a cracked boiled egg should be eaten within a day or discarded if it sat out.

Peeling removes a thin layer of white along with the shell membrane, so a peeled egg weighs slightly less and carries marginally less protein, on the order of 0.1 to 0.2 grams. That's not worth counting. The bigger loss comes from overcooking, which turns the yolk gray-green from iron sulfide formation and makes the white rubbery, but the protein grams hold steady.

Freezing changes texture badly. Raw egg yolks frozen without sugar or salt become gelatinous and unusable, so commercial frozen egg products add those ingredients. Frozen whole eggs from the store retain their protein content, but home-frozen raw eggs in shells will crack and should be beaten first.

The failure case worth knowing: eggs left in a hot car or on a counter for more than two hours should be discarded, per FDA guidance, because Salmonella risk rises with time and temperature. That's a food safety rule, not a protein one. Cooked egg dishes like frittatas keep three to four days refrigerated, and their protein content is stable across that window.

Egg Protein Fits Almost Every Eating Pattern, With Two Real Exceptions

Vegetarians who eat eggs get a complete protein that requires no combining tricks. Vegans avoid them entirely, and egg allergies affect roughly 1 to 2 percent of children, most of whom outgrow it by adolescence according to the American College of Allergy, Asthma and Immunology. For that population, eggs are off the table regardless of protein content.

People with chronic kidney disease often need restricted protein intake, and a nephrologist sets the limit individually. Eggs are a high-quality source but also carry phosphorus, about 95 milligrams per large egg, mostly in the yolk, which matters for some kidney patients managing mineral balance. The kidney dietitian, not a general article, should set that number.

Cholesterol is the other exception. One large egg yolk contains about 186 milligrams of cholesterol, per USDA data. The 2015 Dietary Guidelines Advisory Committee dropped the specific 300-milligram daily limit for healthy adults, concluding that dietary cholesterol has modest effect on blood cholesterol for most people. People with familial hypercholesterolemia or diabetes should discuss egg intake with their clinician, because response varies.

For the majority, eggs fit Mediterranean, vegetarian, low-carb, and omnivorous patterns without modification. One egg supplies 6.3 grams of protein for about 72 calories, a ratio that's hard to beat with any whole food.

Frequently Asked Questions

Does the protein in an egg change if I eat only the white?

No, the total available protein just drops by the yolk's share, which is about 2.7 grams in a large egg. The white alone carries roughly 3.6 grams, so a three-white omelet delivers about 10.8 grams versus 18.9 grams for three whole eggs. Anyone cutting yolks for calorie reasons forfeits 43 percent of the protein along with fat-soluble nutrients like vitamin D and lutein.

Are jumbo eggs a better protein value than large eggs?

Only if the price per dozen rises less than the protein gain, which is about 22 percent from large to jumbo. A dozen jumbo eggs carries roughly 92 grams of protein versus 76 grams for large. If the jumbo carton costs more than 22 percent above the large, large eggs are the better buy per gram, and most retail pricing tracks close to that break-even line.

Can I count egg protein if I'm boiling them for meal prep on Sunday?

Yes, and the count holds for about a week in the refrigerator at 40°F or below, per USDA FoodSafety.gov. Hard-cooked eggs in the shell stay safe and nutritionally stable across that window. Peel them just before eating rather than in advance, since peeled eggs dry out and pick up fridge odors faster.

Do eggs have enough protein to count as a complete protein source on their own?

They do, and they score 1.00 on the PDCAAS scale the World Health Organization uses, the highest possible rating. That means one egg supplies all nine essential amino acids in proportions your body can fully use. The limiting factor for eggs as a sole protein source is quantity, not quality: you'd need about nine large eggs to hit a 56-gram daily target.

Is raw egg protein absorbed better than cooked?

The opposite is true. Raw egg whites are only about 51 to 91 percent digestible in studies using labeled protein, while cooked egg protein is absorbed at roughly 91 percent, according to research published in the Journal of Nutrition in 1998. Raw whites also contain avidin, which binds biotin and can cause deficiency with regular consumption, so cooking improves both safety and usable protein.

How does egg protein compare with whey or chicken per serving?

A large egg's 6.3 grams is modest next to a 100-gram chicken breast at about 31 grams or a scoop of whey at 24 grams. Per calorie, though, egg protein is competitive at roughly 0.087 grams per calorie versus chicken near 0.16 and whey near 0.20, so eggs trade some density for whole-food micronutrients. That makes them a breakfast and snack protein rather than a post-workout staple for high targets.

Do I need to worry about cholesterol if I eat two eggs a day for the protein?

For most healthy adults, the 2015 Dietary Guidelines Advisory Committee found dietary cholesterol has modest effect on blood cholesterol, and two eggs daily supplies about 372 milligrams. People with familial hypercholesterolemia, diabetes, or existing cardiovascular disease should set their own limit with a clinician, since individual response varies widely and this article can't determine yours.