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One large hard-boiled egg that weighs 50 grams has 78 calories. With 1.6 calories per gram, a hard-boiled egg is a low-energy dense food. Energy density refers to a food's calorie count compared to its weight. Foods with a low-energy density fill you up on fewer calories.
General Nutrition. One large hard-boiled egg has 78 calories, 6.3 grams of protein, 5.3 grams of fat, negligible amounts of carbohydrates and no fiber.itamins. Hard-boiled eggs are a rich source of several different vitamins. One large egg offers 23 percent of the recommended dietary allowance of vitamin B-12, 8 percent of the RDA of vitamin A, 7 percent of the RDA of vitamin D and 6 percent of the RDA of folate.