
Found
this which might give you a general idea.
How silly though that the feeding guidelines are based on what the puppy will be as an adult. What about crossbreeds where you have no idea how big/small they'll end up! I know you should go on how the dog looks and alter the food intake as necessary but a lot of people do use the feeding charts on packets as a guideline, especially a first puppy.
Hope that site helps anyway :)