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Cat Calorie Needs

Calculate your cat's daily calorie needs based on weight, activity and neutering status

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๐Ÿ‡ฉ๐Ÿ‡ฐ All calculations are based on Danish rules, rates, and currency (DKK). This calculator is translated for convenience but applies exclusively to Denmark.

Calorie needs for cats

Our calculator uses the recognized RER formula (Resting Energy Requirement) to calculate your cat's daily calorie needs. RER is calculated as 70 ร— weight^0.75 and then adjusted for activity level and neutering status.

What is RER?

RER stands for Resting Energy Requirement and is the energy a cat burns at rest. It's the basis for calculating total daily energy needs. An average adult cat weighing 4 kg has a RER of about 198 kcal. The actual calorie need is adjusted with factors for activity and whether the cat is neutered.

Neutered cats have lower calorie needs

Neutered cats typically have about 15% lower calorie needs than unneutered cats because hormonal changes lower the metabolism. It's important to adjust food amounts after neutering to avoid obesity, which can lead to diabetes, joint problems and other health issues.

Activity level and calories

A sedentary indoor cat needs fewer calories than an active outdoor cat. Low activity uses about RER ร— 1.0, normal activity about RER ร— 1.2 and high activity about RER ร— 1.4. Adjust the amount according to your cat's actual activity pattern.

Frequently Asked Questions

How many calories does a cat need per day?

An average adult cat weighing 4 kg needs about 200-250 kcal per day. Neutered cats need about 15% less. Active outdoor cats may need up to 300 kcal. Kittens and pregnant cats have higher needs.

What happens if my cat gets too many calories?

Too many calories lead to obesity, which increases the risk of diabetes, joint problems, liver issues and heart disease in cats. About 40-50% of all cats are overweight. Regularly check your cat's weight and adjust food amounts.

Should a neutered cat have less food?

Yes, neutered cats typically have about 15% lower calorie needs than unneutered ones due to hormonal changes that lower metabolism. Gradually adjust food amounts after neutering and monitor your cat's weight.

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