Egg conversion?

I have a recipe for molded cookies which calls for medium eggs so that the cookie as it is baking doesn’t lose its detail. Does anyone have a formula, i.e. volume/liquid measurement equivalent for using large or extra large egg?

Thanks so much. My recipe needs 1 medium egg and I have large ones. I’m from New England and frugal – didn’t want to buy a dozen medium eggs. Now all I have to do is throw away 1/4 T of a large egg! Oh no, down the drain it goes!