Purina MER Calculator for Cats
Calculate your cat's daily caloric needs using Purina's Metabolizable Energy Requirement formula. Get personalized feeding recommendations based on your cat's weight, age, and activity level.
How to Use This Calculator
- Enter your cat's current weight in pounds
- Enter your cat's target weight (same as current for maintenance)
- Provide your cat's age in years
- Select your cat's activity level
- Choose the appropriate life stage
- Select reproductive status
- Click Calculate to see daily caloric needs
Formula Used
MER = RER × Activity Factor
RER = 70 × (Body Weight in kg)^0.75
Where:
- MER = Metabolizable Energy Requirement (daily calories needed)
- RER = Resting Energy Requirement (calories needed at rest)
- Activity Factor = Multiplier based on life stage, neuter status, and activity level
Example Calculation
Real-World Scenario:
Let's calculate the daily caloric needs for a 4-year-old neutered indoor cat weighing 10 pounds with moderate activity.
Given:
- Weight = 10 lbs (4.5 kg)
- Age = 4 years
- Life Stage = Adult
- Reproductive Status = Neutered
- Activity Level = Moderate
Calculation:
RER = 70 × (4.5 kg)^0.75 = 70 × 2.86 = 200 kcal/day
Activity Factor = 1.2 (neutered adult cat with moderate activity)
MER = 200 × 1.2 = 240 kcal/day
Result: This cat needs approximately 240 kcal per day to maintain its current weight.
Why This Calculation Matters
Practical Applications
- Preventing obesity in indoor cats
- Ensuring proper nutrition for growing kittens
- Managing weight in senior cats
Key Benefits
- Extending your cat's lifespan through proper nutrition
- Preventing obesity-related health issues
- Optimizing energy levels and overall health
Common Mistakes & Tips
Frequently Asked Questions
References & Disclaimer
Veterinary Disclaimer
This calculator provides estimates based on standard formulas and should not replace professional veterinary advice. Always consult with your veterinarian before making significant changes to your cat's diet, especially if your cat has health conditions or is on medication.
References
- Purina: Feeding Guide - How Much Should I Feed My Cat? - Official feeding guidelines from Purina
- Association of American Feed Control Officials (AAFCO) - Nutrient requirements for cats
- Cornell Feline Health Center - Feline nutrition research and guidelines
Accuracy Notice
This calculator provides estimates based on average metabolic rates. Individual cats may have different caloric needs based on genetics, health status, and environmental factors. Monitor your cat's weight and body condition regularly and adjust feeding amounts as needed in consultation with your veterinarian.
About the Author
Kumaravel Madhavan
Web developer and data researcher creating accurate, easy-to-use calculators across health, finance, education, and construction and more. Works with subject-matter experts to ensure formulas meet trusted standards like WHO, NIH, and ISO.