An average egg contains between 55 and 80 calories depending on its size. Specifically:

• Small egg: about 54–55 calories
• Medium egg: around 63–66 calories
• Large egg: approximately 72–80 calories
• Extra-large egg: about 80 calories
• Jumbo egg: around 90 calories

Most of these calories come from the yolk, which is nutrient-dense. Egg whites have fewer calories (about 17 calories for a large egg white)

. The calorie count also varies by cooking method:

• Boiled or poached large egg: about 74–79 calories
• Fried egg: ranges from 85 to 120 calories depending on the oil or butter used
• Scrambled eggs (with milk and butter): roughly 170–245 calories for two eggs
• Omelette (plain, 1 egg): about 96 calories

In summary, a typical large egg has roughly 70–80 calories, with variations depending on size and preparation method.