🍽️ Pet Calorie Calculator
Enter your dog's or cat's weight and life stage to estimate their resting and daily calorie needs using the same RER and MER formulas vets use.
🔧 Estimate Daily Calorie Needs
What is a Pet Calorie Calculator?
A pet calorie calculator estimates how much energy your dog or cat needs in a day. It combines body weight with a life-stage and activity factor to turn the veterinary resting-energy formula into a practical daily calorie target you can feed to.
Getting calories right is the foundation of healthy weight management — pet obesity is one of the most common and preventable health problems, and the number here helps you feed enough without overfeeding.
❓ Frequently Asked Questions
How are my pet's daily calories calculated?
The calculator starts with the Resting Energy Requirement (RER), the calories a pet burns at complete rest, using the veterinary formula RER = 70 × (body weight in kg)^0.75. It then multiplies that by a factor for your pet's life stage and activity — a growing puppy or a working dog needs far more than a sedentary, neutered adult — to give the Maintenance Energy Requirement (MER), which is the daily target.
Why does spaying or neutering change the calorie number?
Neutering lowers a pet's metabolic rate and tends to increase appetite, so a fixed adult typically needs noticeably fewer calories than an intact one of the same weight. Feeding a neutered pet as if it were intact is one of the most common causes of creeping weight gain, which is why the tool offers separate factors for each.
Should I feed the exact number the calculator gives?
Use it as a well-grounded starting point, then adjust based on what you see. Weigh your pet regularly and check body condition — you should feel the ribs easily without a layer of fat and see a visible waist from above. If your pet is gaining or losing when you don't want them to, nudge the amount up or down and consult your vet, especially for puppies, seniors, or pets with health conditions.
Do treats count toward the daily total?
Yes. Treats, dental chews, and table scraps all add up, and they should make up no more than about ten percent of daily calories. If you train with a lot of treats, subtract those calories from the meal portions so your pet doesn't slowly overeat.