Energy From Eggs. The calories you’ll get from an omelet increase as the eggs pick up some of the fat you use in the pan, so use as little fat as possible. For example, a plain, two-egg omelet has about 43 more calories than two raw eggs. As a general guideline, plan on getting 188 calories from two large, whole eggs cooked into an omelet. They also contain 12.9 grams of complete protein, which is 28 percent of women’s recommended daily allowance, and 23 percent of men’s.