Stop guessing. Get a personalized daily calorie and portion guide for your dog or cat, powered by the same RER/MER formula veterinarians use worldwide.
Step 1
Select your pet type to get started. The calculator will adjust all values accordingly.
Trusted Science
Built on peer-reviewed veterinary nutrition science, not pet food marketing.
We use the RER/MER formula from the National Research Council's Nutrient Requirements of Dogs and Cats (2006), the gold standard for veterinary nutrition worldwide.
Your pet's caloric needs vary by life stage, spay/neuter status, and activity. We apply the correct WSAVA-aligned multiplier for each combination automatically.
We convert calories into cups or cans based on your food type. Enter your brand's caloric density from the bag for the most accurate result.
Input your pet's Body Condition Score and we'll estimate their ideal weight range and flag if their current diet needs adjustment.
Learn More
Science-backed articles to help you keep your pet healthy and happy.
The vet-standard RER/MER formula, how to convert it into an actual portion, and how to count treats and scraps without losing track.
Read guide →How diet and insulin timing work together, what to feed a diabetic dog versus a diabetic cat, and the warning signs that mean it's time to call your vet.
Read guide →The vet-standard growth formula, a feeding chart by age and weight, and why Labradors need closer portion control than most breeds.
Read guide →Why fresh food math runs on kcal per gram instead of kcal per cup, and how to transition without stomach upset.
Read guide →How to read cat food labels, meet AAFCO standards, and match a formula to your cat's life stage.
Read guide →What to enter into a dry food calculator, how to read the kcal-per-cup label on the bag, and how to check the result against your dog's body condition.
Read guide →Common Questions
Daily food needs depend on your dog's weight, age, activity level, and whether they are spayed or neutered. The vet-standard formula is: RER = 70 × (body weight in kg)0.75, multiplied by a life-stage factor (1.6 for a neutered adult at moderate activity, 1.8 for intact). Use the free calculator above for a personalized result.
A typical 10 lb neutered adult indoor cat needs approximately 200–260 kcal/day. At 350 kcal/cup of dry kibble, that is roughly 0.6–0.75 cups per day. Exact amounts vary by activity level, food brand, and reproductive status; use the calculator for a personalized estimate.
RER (Resting Energy Requirement) = 70 × (body weight in kg)0.75 kcal/day. MER (Maintenance Energy Requirement) = RER × a life-stage multiplier. Multipliers range from 0.8 (weight-loss cat) to 4.0 (lactating dog). This formula is published by the National Research Council in Nutrient Requirements of Dogs and Cats (2006) and is the same method used by veterinarians worldwide.
Divide pounds by 2.205 to get kilograms. For example, a 22 lb dog weighs 22 ÷ 2.205 = 9.98 kg ≈ 10 kg. The calculator accepts either unit and converts automatically.
Yes, significantly. Spaying or neutering reduces a pet's metabolic rate. Neutered dogs typically need about 20% fewer calories than intact dogs of the same weight and activity level. For cats, the reduction can be 24–33%. The calculator applies the correct multiplier automatically based on your selection.
The best indicator is Body Condition Score (BCS), not scale weight. At an ideal BCS of 4–5 on the 9-point WSAVA scale, you should be able to feel your pet's ribs easily without pressing hard, see a visible waist from above, and notice an abdominal tuck from the side. If ribs are hard to feel, reduce daily portions by 10%. See our guide: How to Tell If Your Pet Is Overweight.
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