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The Cat Food Calculator works out exactly how many calories your cat needs each day using the same Resting Energy Requirement (RER) formula used by veterinary nutritionists, then converts that to a daily food portion.
Every result is based on published veterinary research and veterinarian-reviewed formulas — not generic averages. Completely free, works instantly, requires no account or sign-up.
How to Use This Calculator
1
Enter Your Cat's Details
Fill in the fields above — weight, age, or breed size. Every field has a clear label.
2
Click Calculate
Press the button to get your instant result. No page reload, no account needed.
3
Review Your Result
Your result appears immediately with the primary answer and additional context.
4
Use the Information
Share or save your result. Always discuss health results with your veterinarian.
How It Works
RER = 70 × (body weight in kg)^0.75. This is multiplied by an activity factor based on whether your cat is inactive, average, or active, giving your cat's daily Maintenance Energy Requirement in kilocalories.
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Veterinary Research
Every formula is from peer-reviewed veterinary studies and clinical guidelines.
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Instant Results
No page reload, no waiting, no account needed. Results appear immediately.
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100% Private
All calculations happen in your browser. Nothing is stored or shared.
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Always Free
Every calculator on Xperts Pet is completely free — no premium tier, no catch.
Frequently Asked Questions
A typical 10lb indoor cat needs roughly 200-300 calories per day, though this varies with activity level and whether the cat is neutered.
Most adult cats do well on 2 meals per day. Free-feeding dry food is common but can contribute to obesity — measured portions are generally recommended.
Wet food has higher moisture content, supporting hydration and urinary health. Many vets recommend at least some wet food in a cat's diet.
Use your cat's ideal weight rather than current weight in the calculator, and select a lower activity level to create a gentle calorie deficit.
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Veterinary Disclaimer
These calculators provide general guidance based on veterinary formulas. Results should not replace professional veterinary advice. Always consult a qualified veterinarian before making medical or dietary decisions for your pet.