Check out this presentation about calories in an apple. It has all the details about apples: small, medium or large, plus ingerdients and some fun facts:

Comparing calories in an apple to calories in a coke: how many apples would equal a coke?

Comparing calories in an apple to pizza calories: how many apples would equal a pizza?

You get the idea.

You can download the “calories in an apple” presentaion, or watch the “calories in an apple” online presentation.