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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.
Calories in one hard boiled egg In chicken eggs there are: approx 80 calories in one extra large size hard-boiled egg approx 90 calories in one jumb â¦ o size hard-boiled egg approx 54 calories in one small size hard-boiled egg approx 63 calories in one medium size hard-boiled egg approx 72 -78 calories in one large size hard-boiled egg. For the calorie content of scrambled eggs, see the page links, further down this page, listed under Related Questions.