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About this Tool

This calculator estimates a cat's daily caloric needs using the same two-step veterinary formula as dogs. It provides a solid starting point, but individual needs can vary. Always monitor your cat's body condition and adjust feeding as necessary.

Step 1: Resting Energy Requirement (RER)

The RER is the energy required for a cat to perform essential bodily functions at rest (breathing, digestion, etc.). The formula is based on metabolic body weight:

$$ RER = 70 \times (\text{body weight in kg})^{0.75} $$

This formula is considered the most accurate for a wide range of animal sizes.

Step 2: Maintenance Energy Requirement (MER)

The MER is your cat's total daily energy need. It's calculated by multiplying the RER by a factor based on their life stage and activity level.

The multipliers used in this calculator are:

• Neutered / Spayed Adult: 1.2 x RER
• Intact Adult: 1.4 x RER
• Inactive / Prone to Obesity: 1.0 x RER
• Weight Loss Plan: 0.8 x RER
• Weight Gain Plan: 1.8 x RER
• Active / Outdoor Cat: 1.6 x RER
• Kitten (Under 1 year): 2.5 x RER

Important Considerations

• Starting Point Only: These calculations are estimates. Adjust food intake to achieve or maintain an ideal body condition.
• Ideal Weight: For weight loss or gain plans, you should use your cat's *ideal* or *target* weight, not their current weight.
• Treats: Treats should not make up more than 10% of your cat's total daily calorie intake.
• Consult a Vet: Always consult with a veterinarian for a nutrition plan, especially for kittens, or cats with medical conditions.