Free tool

Cat Calorie Calculator

Calculate exactly how many calories your cat needs per day — based on the NRC (National Research Council) formula used by veterinary nutritionists, adjusted for age, weight, and activity level.

Cat's weight (kg)

Age

Activity level

Neutered?

How this is calculated

The formula uses Resting Energy Requirement (RER): 70 × (body weight in kg)^0.75. This is then multiplied by a life-stage factor from the NRC's Nutrient Requirements of Cats.

Neutering reduces a cat's energy needs by roughly 20–25% because of hormonal changes that lower metabolic rate. Most owners significantly overfeed neutered indoor cats, which is the leading cause of feline obesity.

This is a starting point — individual cats vary. If your cat is gaining or losing weight on these calories, adjust by 10% and monitor over 2 weeks.

Read: Why is my cat gaining weight? →

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Cat Calorie Calculator

How this is calculated

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