Dog Calorie Calculator
How many calories a dog needs depends on its weight and life stage. The estimate below uses the same formula vets use — resting needs scaled by an activity factor — so it is a sound place to start portioning food.
Daily calories
794 kcal
per day — for a 30 lb dog.
How many calories does a dog need?
Vets start from the resting energy requirement — the calories a dog burns at rest — then multiply by a factor for its life stage. The resting figure is 70 × (body weight in kg) raised to the power 0.75; the factor is 1.6 for a neutered adult, 1.8 if intact, 1.4 for a dog prone to weight gain, and 2 to 3 for a growing puppy.
Treat the number as a starting point, not a prescription: Merck notes a given dog can need as much as 30% more or less than another dog of the same weight. Weigh your dog every few weeks and adjust the portion if it is gaining or losing.
Common questions
How many calories does my dog need a day?
Start from the resting energy requirement — 70 × (body weight in kg) raised to 0.75 — then multiply by a factor for life stage: 1.6 for a neutered adult, 1.8 if intact, 1.4 for a dog prone to weight gain, and 2 to 3 for a growing puppy.
How do I turn calories into cups of food?
Read the kilocalories per cup printed on your dog food, then divide the daily figure above by it. That number differs from one food to the next, so we can’t do that step for you without knowing the bag.
Does neutering change how much my dog needs?
Yes. The Merck Veterinary Manual uses 1.6 × resting needs for a neutered adult against 1.8 for an intact one — roughly 11% less for the same weight.
Why can two dogs of the same weight need different amounts?
Activity, age, coat, climate and individual metabolism all move the figure; Merck notes a given dog can need as much as 30% more or less than another dog of the same weight. Weigh your dog every few weeks and adjust — the scale is a better guide than any formula.
This is a starting estimate. A dog’s real needs can run 30% higher or lower with age, breed and activity, and a weight-loss plan should be set with a veterinarian, not guessed. It does not replace professional advice.
Verified on . Based on Nutritional Requirements of Small Animals — energy requirements of the dog and cat (Merck Veterinary Manual, “Energy” section, accessed 2026-07-23). See the method.