A single large hard-boiled egg contains about 78 calories. That makes it one of the most nutrient-dense foods you can eat for under 100 calories, packing over 6 grams of protein, healthy fats, and a surprisingly wide range of vitamins and minerals into a small package.
Full Nutrient Breakdown
Here’s what you get from one large hard-boiled egg (about 50 grams):
- Calories: 78
- Protein: 6.3 g
- Total fat: 5.3 g (1.6 g saturated)
- Carbohydrates: 0.56 g
Eggs are essentially a zero-carb food. Nearly all their calories come from protein and fat, which is one reason they keep you full longer than many breakfast options with the same calorie count.
Where the Calories Live: Yolk vs. White
The yolk and white split the calories unevenly. The white of a large egg has just 17 calories and 3.6 grams of protein, with almost no fat. The yolk carries 55 calories, 2.7 grams of protein, and 4.5 grams of fat. If you eat only egg whites, you’re cutting calories by about 75% per egg, but you’re also losing more than half the protein and nearly all the vitamins.
Most of the egg’s nutritional value is concentrated in the yolk. Choline, a nutrient important for brain function and liver health, is almost entirely found there (680 mg per 100 g of yolk compared to just 1 mg per 100 g of white). The yolk also supplies vitamin B12 and selenium. A single egg can provide roughly 50 to 70% of your daily selenium needs if the hens were raised on selenium-enriched feed, though a standard egg contains less.
Boiled vs. Fried: The Calorie Difference
Boiling is the leanest way to cook an egg because it adds nothing. A fried egg jumps to about 90 calories, and that’s with minimal oil. Use a tablespoon of butter and you could add another 30 to 50 calories on top. Poaching is comparable to boiling since the egg cooks in water. Scrambled eggs vary widely depending on whether you add milk, butter, or cheese.
Why Eggs Keep You Full
The 78 calories in a boiled egg punch above their weight when it comes to appetite control. A crossover study in overweight and obese adults compared an egg breakfast to a cereal breakfast and found that people who ate eggs consumed significantly fewer calories for the rest of the day. After the egg breakfast, total energy intake dropped by about 18% compared to the cereal day.
Participants also reported feeling less hungry, more satisfied, and fuller for longer after eating eggs. Hunger returned to baseline much more quickly after cereal. The egg breakfast even reduced the desire for sweet foods later in the day. This comes down to protein: at 6.3 grams per egg, two or three boiled eggs deliver a high-protein start that slows digestion and stabilizes blood sugar more effectively than a carb-heavy meal with the same number of calories.
Cholesterol: What You Should Know
One large egg contains about 186 mg of cholesterol, all in the yolk. For years, dietary guidelines set strict limits on cholesterol intake, which gave eggs a bad reputation. That thinking has shifted considerably. The American Heart Association’s 2026 dietary guidance states that dietary cholesterol is no longer a primary target for heart disease risk reduction for most people, and that moderate egg consumption fits within a heart-healthy eating pattern.
The bigger concern, according to the AHA, is what you eat alongside eggs. Bacon, sausage, and other processed meats commonly paired with eggs at breakfast carry their own cardiovascular risks. A boiled egg on its own, or paired with vegetables and whole grains, is a different nutritional story than a plate of eggs with fried processed meat.
Quick Calorie Math for Multiple Eggs
If you’re tracking calories, here’s a simple reference:
- 1 large boiled egg: 78 calories
- 2 large boiled eggs: 156 calories
- 3 large boiled eggs: 234 calories
Egg size matters. Medium eggs run closer to 63 calories, while jumbo eggs can hit 90. If you’re buying from a farmers’ market where sizes aren’t standardized, the calorie count per egg could vary by 15 to 20 calories in either direction.
Storing Hard-Boiled Eggs Safely
Hard-boiled eggs last up to seven days in the refrigerator, whether peeled or unpeeled. That makes them ideal for meal prep. Store them in a sealed container to prevent them from absorbing fridge odors. If you notice a slimy texture, off smell, or discoloration, discard them regardless of how recently they were cooked.