According to the United States Agricultural Department, two eggs alone contain about 142 calories. However, if you add butter or oil to the pan, you will need to factor in those calories, as well. A tablespoon of butter lends about 100 calories, and a tablespoon of most vegetable oils adds 124 calories to your dish. So a couple of large eggs scrambled with a tablespoon of butter is about 240 calories. A little more if you cook with oil. And don't forget to factor in any calories from added vegetables or cheese. Cheese can really rack up the calories. But vegetables will add a negligible amount in comparison to the eggs and cooking fat.