Dog Calorie Calculator
How many calories does your dog need every day? Enter its weight and life stage to see the daily calories and the resting energy requirement the estimate is based on.
A starting point, not a prescription
Daily calories
985 kcal
Check the highlighted fields to see your result.
- Resting energy (RER)
- 615 kcal
- Life stage factor
- × 1.6
Results are estimates for information only and do not constitute financial, medical, or legal advice.
How it works
The calculator starts with the resting energy requirement (RER): the calories a dog uses at rest, which depends on its body weight. Then it multiplies by a factor for the dog's life stage to get the maintenance energy requirement, the calories per day to start from. Every dog is different, so adjust by watching its weight and body condition.
The formulas
RER = 70 × (weight in kg)0.75
Calories per day = RER × life stage factor
Factors used: puppy under 4 months 3.0, puppy 4 to 12 months 2.0, neutered adult 1.6, adult not neutered 1.8, less active or prone to weight gain 1.3, and weight loss 1.0 (using the ideal weight).
Worked example
A neutered adult dog weighs 40 lb, which is 18.1 kg.
- RER: 70 × 18.10.75 = 615 kcal.
- Calories per day: 615 × 1.6 = 985 kcal.
Sources and cautions
The method follows theMerck Veterinary Manual on nutritional requirements. These are estimates by weight and life stage, not by breed, and real needs can differ by about 30% in either direction. Check with your veterinarian, especially if your dog is overweight, pregnant, nursing, or has a health condition.
Frequently asked questions
How many calories does my dog need per day?
A neutered adult dog needs about 1.6 times its resting energy requirement. For a 40 lb (18 kg) dog that is roughly 985 calories a day. Puppies, active dogs, and dogs that are not neutered need more; less active dogs need less.
Are "calories" and "kcal" the same?
Yes. The calories on pet food labels and in nutrition guides are kilocalories (kcal), the same unit used for human food.
How many calories should an overweight dog eat?
The AAHA guidelines suggest calculating calories from the dog's ideal weight, not its current weight, and then feeding a percentage of that amount. Choose "Weight loss plan" and enter the ideal weight, but ask your vet to set the target, since losing weight too fast is unsafe.
Do treats count?
Yes. Treats, chews, and table scraps all add calories. If you give treats, take their calories out of the daily total so your dog does not gain weight.