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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.
So how many calories in a hard boiled egg? As you can see from the table, there are about 1.5 calories per gram of hard boiled egg. A large hard-boiled egg for example has approximately 74 calories in it (give or take a few calories). These calories come from a combination of the calories in the egg yolk and the calories in the egg white. The egg yolk contains most of the calories however, and the egg white contains the majority of the protein. Approximately 70% of the calories in a hard boiled egg comes from the egg yolk.