Pet Calorie Calculator
How much food, roughly.
Pet Calorie Calculator
Estimate resting and daily calorie needs for a dog or cat from body weight and life stage.
Use your pet’s current weight, and ask a veterinarian before changing a diet. Growing, pregnant, and medically fragile animals need individual assessment, not a formula.
630kcal/day
Maintenance estimate for a neutered adult
- Resting energy (RER)
- 394 kcal
- Life-stage factor
- ×1.6
- Practical range
- 567–693 kcal
- Treat allowance (10%)
- 63 kcal
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What This Calculator Does
The Pet Calorie Calculator estimates resting energy requirement and daily maintenance calories for a dog or cat. It uses body weight and a life-stage factor, and shows a practical range plus a treat allowance so the number can be used for feeding rather than just displayed.
How It Works
Resting energy requirement is 70 × body weight in kilograms raised to the power 0.75, the allometric scaling used in veterinary nutrition. Maintenance energy multiplies that by a life-stage factor: about 1.6 for a neutered adult dog, 1.2 for a neutered adult cat, lower for weight loss, and higher for growth.
Example
A 10 kg neutered dog has a resting requirement of 70 × 10^0.75 ≈ 394 kcal. Multiplying by 1.6 gives about 630 kcal a day, with a practical range of roughly 567–693 kcal and a 63 kcal treat allowance. A 4 kg neutered cat needs about 238 kcal a day instead.
Formula
RER = 70 × weight(kg)^0.75MER = RER × life-stage factorMER × 0.9 to MER × 1.1Individual metabolism, activity, and body condition vary more than the formula admits.
Reading the Results
Daily calories
A starting maintenance estimate for an adult animal at the chosen life stage. Adjust up or down over a few weeks based on body condition, not on the number alone.
Resting energy
The energy needed at complete rest in a thermoneutral environment. It is the baseline that life-stage and activity factors multiply.
Sources and References
National Research Council — Nutrient Requirements of Dogs and Cats (2006)
Resting and maintenance energy equations
The standard scientific basis for the 70 × BW^0.75 allometric equation.
World Small Animal Veterinary Association — Global Nutrition Guidelines
Body condition scoring and feeding assessment
Recommends adjusting intake to body condition rather than relying on a formula alone.
American Animal Hospital Association — Nutritional Assessment Guidelines
Life-stage and clinical nutrition screening
Explains why growing, pregnant, and ill animals need individual veterinary assessment.
References identify the method or data behind this calculator. Where a standard or tariff changes, the current edition applies, and the assumptions stated above take precedence over a remembered figure.
Frequently Asked Questions
How accurate is a calorie formula for pets?
It is a starting point, not a prescription. Two dogs of the same weight can differ by 25% in energy needs because of age, activity, neuter status, and individual metabolism. Adjust gradually and judge by body condition.
Should I use current weight or ideal weight?
Use current weight for a rough estimate, but if the animal is overweight, calculate from its target weight instead. Feeding an overweight pet for its current weight keeps it overweight.
How much of the daily calories can be treats?
A common guideline is no more than about 10% of daily calories from treats, with the rest from a complete balanced food. The calculator shows that allowance so it is easy to keep track.
Why is the cat factor lower than the dog factor?
Cats have a different metabolic rate and are more prone to obesity, so the maintenance multipliers used in veterinary practice are lower. A neutered adult cat is typically about 1.2 times resting energy, against 1.6 for a comparable dog.