The number of calories in an egg varies primarily by its size and preparation method:

• A small egg (~38 grams) contains about 54 calories.
• A medium egg (~44 grams) contains about 63 to 66 calories.
• A large egg (~50-56 grams) contains about 72 to 80 calories.
• An extra-large egg (~56 grams) contains about 80 calories.
• A jumbo egg (~63 grams) contains about 90 calories

Regarding cooking methods:

• A boiled or poached egg retains the same calorie count as raw, typically around 74 to 79 calories for a large egg.
• A fried egg has more calories due to added fat from cooking oil or butter, ranging from 85 to 120 calories depending on the amount and type of fat used.
• Scrambled eggs made with milk and butter can range from about 170 calories for two eggs (microwave method) to 200-245 calories (pan method with butter)

In summary, a typical large egg has roughly 70 to 80 calories , with variations depending on size and cooking method. Most calories come from the yolk, which contains fats and essential nutrients, while the white is mostly protein with fewer calories