One egg equals 1/4 cup of liquid egg substitute. Liquid egg substitute can replace real eggs in almost all recipes. To obtain good results, add the substitute to the preparation at the point when real eggs would be added.
The majority of liquid egg substitutes are made from egg whites, coloring and seasoning, so they are not a good alternative for those who suffer egg allergy. However, since substitutes do not contain egg yolks, which is where all an egg's fat and cholesterol are found, they offer a fat-free alternative to whole eggs.
Some egg substitutes are not made from eggs, which makes them suitable for those allergic to eggs.