There are:
- approx 32-34 calories in a 2 egg white omelette if you do not add anything to the omelet and if you cook it on a non-stick surface that requires no oil or fat.
The calorie content of the onions will depend on how much onion you use and whether you dry fry that or not. For the calorie content of onions, see the page link, further down this page listed under Related Questions