Cat Food Calculator

Obesity is the root of many feline health issues. Find the right daily portion.

Daily portion
Daily energy need (DER)
Resting energy (RER)
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How the portion is calculated

The Resting Energy Requirement is RER = 70 ร— body weight (kg) to the 0.75 power, multiplied by a factor for spay/neuter status and activity. Spayed/neutered indoor cats have lower metabolism, so bag guidelines often lead to overfeeding.

If you feed wet food too

A wet can (usually 70โ€“90 kcal per 80g) counts toward daily calories. If the daily need is 200 kcal and you give one 80 kcal can, fill the remaining 120 kcal with dry food.

Is free-feeding bad?

Spayed/neutered indoor cats easily overeat with free-feeding. Measured portions split into 2โ€“4 meals help with weight control.

How do I know if my cat is overweight?

From above, no visible waistline and ribs hard to feel are signs of excess weight. A vet's body condition score (BCS) confirms it.

This result is for reference only. Consult your vet if your cat has a medical condition.