A typical tomato and cheese omelet contains 508 calories. Depending on the kind of cheese you use, whether you like sun-dried tomatoes packed in oil rather than fresh, and how much oil you use to cook your omelet, that calorie count can be higher or lower.
Eggs
A typical omelet contains 2 eggs per serving. According to the USDA National Nutrient Database, 1 large egg contains 72 calories. The eggs in a 2-egg omelet will contain 144 calories. If you make your omelet from egg whites alone, calculate that each egg white contains 17 calories.
Tomatoes
Fresh red tomatoes, chopped or sliced, contain 8 calories in one-quarter cup. If you use canned, crushed tomatoes, a quarter of a a cup contains 10 calories. If you prefer sun-dried tomatoes, packed in oil and drained, a quarter of a cup contains 59 calories.
Cheese
The calories in your omelet will vary greatly depending on the cheese you choose. A 100-g slice of cheddar cheese contains 403 calories. The same size slice of part-skim mozzarella cheese contains 254 calories. A 100-g slice of American cheese, sometimes called cheese food, contains 137 calories.
Preparation
If you fry your omelet in unsalted butter, add 102 calories per tablespoon. If you use canola oil, add 124 calories for every tablespoon.
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