Way to calculate how much food your dog needs:
The Dog Food Calculator below can help you estimate the proper serving size for your pet. It’s based upon a study published by a respected veterinary institute.
To use the calculator, you’ll need to know your dog’s ideal weight. This is what you believe your pet should weigh.
You’ll also need to know the number of calories in the specific dog food you’re feeding him.

From the folks who published the above – here is the newest info that provides a lot more than just calculation: “Our pet experts published an updated piece to that article complete with advice on how much to feed your pup by age, ways to tell if your dog is at a healthy weight, and feeding tips. We even created a printable calendar that owners can use to keep track of their pet’s food schedule:”