Calculate your cat's daily calorie needs using the same RER/MER formulas veterinary nutritionists use. Based on WSAVA guidelines and AAFCO recommendations.
This tool uses the Resting Energy Requirement (RER) formula: RER = 70 × (body weight in kg)^0.75. Then it applies Maintenance Energy Requirement (MER) multipliers for age, activity level, spay/neuter status, and weight goal.
Enter your cat's weight and select the unit, age category, activity level, spay/neuter status, and weight goal. Click "Calculate" to get the daily calorie target.
Weigh your cat weekly at the same time. Treats should not exceed 10% of daily calories. Always consult your veterinarian before changing your cat's diet.
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Resting Energy Requirement = 70 × (body weight in kg)^0.75. This is the baseline calories needed at rest.
Maintenance Energy Requirement applies activity, age, and neuter status multipliers (0.8x to 2.5x).
Weight loss applies a 15% deficit. Weight gain applies a 15% surplus. Maintenance keeps the MER.