How the calculator works
The resting energy requirement is what a dog burns at rest in a comfortable room: RER = 70 × (ideal weight in kg)0.75. The 0.75 exponent is Kleiber's law, and it matters: the linear shortcut you will see online (30 × kg + 70) drifts badly for very small and very large dogs, which is why the app and this page use the exponent.
The maintenance energy requirement multiplies RER by a life-stage factor from the WSAVA Global Nutrition Toolkit and AAHA guidelines: puppies under four months 3.0, puppies from four months to adulthood 2.0, neutered adults 1.6, intact adults 1.8, low-activity or weight-prone dogs 1.2 to 1.4, dogs in light work 2.0. The calculator shows the range where one exists.
Two rules from the same sources: use the ideal weight, not the current one, or an overweight dog is fed to stay overweight; and expect real dogs to sit anywhere within about 50% of the estimate, so the number is a starting point and body condition is the feedback. Treats should stay under 10% of the day. None of this is feeding advice; it is the arithmetic your vet starts from. For the body-condition side, read Is my dog overweight? How to check in two minutes and How much should my dog weigh?.
Frequently asked questions
How many calories does a 50-pound dog need?
A neutered adult at an ideal 50 lb (22.7 kg) has an RER of about 730 kcal and a maintenance need of about 1,170 kcal a day. An intact adult of the same weight lands near 1,310; a weight-prone one 875 to 1,020.
Should I use current or ideal weight?
Ideal. Feeding to the current weight of an overweight dog maintains the excess. If you are not sure what ideal is, the body condition score and your vet settle it.
Why does the bag say something different?
Feeding guides on packaging are generic ranges for an average dog of that weight. RER and MER are the formulas behind those guides; your dog's real need can differ by up to 50%, so watch the trend and body condition rather than the label.
Does walking change the number?
Only a little for a typical walk: a mile burns roughly 1.3 to 1.6 kcal per kilogram, a few percent of the day. Very active dogs move up a multiplier band instead.
Sources
- National Research Council, Nutrient Requirements of Dogs and Cats, 2006. www.nationalacademies.org/publications/10668
- WSAVA Global Nutrition Toolkit (energy requirement tables). wsava.org/wp-content/uploads/2021/04/WSAVA-Global-Nutrition-Toolkit-English.pdf
- AAHA, 2021 Nutrition and Weight Management Guidelines. www.aaha.org/resources/2021-aaha-nutrition-and-weight-management-guidelines/home/
- Pet Nutrition Alliance, RER and MER reference sheet. petnutritionalliance.org/wp-content/uploads/2023/03/MER.RER_.PNA_.pdf
- APOP, veterinary daily energy requirement calculator. www.petobesityprevention.org/veterinary-der-calculator
This guide is general information from published veterinary and scientific sources, not veterinary advice. Every dog is different: for exercise, weight or feeding decisions, talk to your vet. Pawdometer never gives diet advice.