Cat Calorie Calculator
Calculate accurate daily calories for your cat using veterinary RER formulas with safe weight loss planning
Cat Calorie Calculator
Veterinary-grade calculator using proven RER formulas. Get accurate daily calorie needs for maintenance, weight loss, or weight gain with safety guidelines.
Veterinary Consultation Required
This calculator provides estimates only. Individual cats can vary by up to 50% from calculated values. Always consult your veterinarian before making diet changes, especially for weight loss programs.
Cat Information
Your cat's current weight in pounds
Desired weight for weight loss/gain goals
Cat's age in months
Ideal weight - ribs felt with slight pressure, waist visible
Daily Calorie Requirements
Daily Calories
Total daily energy needs
Per Meal
2 meals/day
Treats Max
10% of daily total
Food Amount Estimates
• Dry food: ~0.71 cups/day (71g)
• Wet food: ~3.1 cans/day (3oz cans)
*Estimates only - check your food\'s calorie content on the label
Calculation Details
• RER: 206 kcal (Simplified formula)
• Multiplier: 1.2x (based on life stage & activity)
• Daily Energy: 206 × 1.2 = 247 kcal
How it works
A cat calorie calculator estimates how many calories your cat needs per day. It starts from the resting energy requirement (RER), based on body weight, then multiplies by a factor for life stage and activity (kitten, neutered adult, weight loss, etc.).
Cat daily calories
RER = 70 × (weight kg)^0.75 Daily need = RER × life-stage factor
- RER
- resting energy requirement (kcal/day)
- factor
- ~1.2 neutered adult, ~2.5 kitten, ~0.8 weight loss
Worked example
- Neutered adult cat, 4.5 kg
- Factor 1.2
- RER = 70 × 4.5^0.75 ≈ 70 × 3.09 ≈ 216
- × 1.2
≈ 260 calories per day.
Good to know
- These are estimates — your vet can refine the target for your cat's body condition and health.
- Measure food by the calorie content on the label, not just by volume.
- Adjust gradually and weigh periodically; sudden changes stress a cat's metabolism.