How do I calculate my cat's daily food portion?

Multiply RER (70 × weight^0.75) by a life-stage factor for daily calories, then divide by your food's kcal per 100g.

Should neutered cats eat less?

Yes. Metabolism drops 20–30% after neutering, so a 1.2 factor helps prevent obesity.

🍚 Cat Food Portion Calculator

Enter weight and life stage to get daily recommended calories and food amount.

Weight (kg)Life stageFood calories (kcal/100g)

How it works

Resting Energy Requirement: RER = 70 × (weight in kg)^0.75. Multiply by a life-stage factor (neutered adult 1.2, kitten 2.5, senior 1.1, etc.) to get the Daily Energy Requirement (DER) — the standard method in veterinary clinical nutrition. Enter your food's kcal per 100g to convert into grams.

Feeding tips

🐾Split the daily amount into 2–4 meals to reduce vomiting and overeating.
🐾Switch from free-feeding to measured meals if you notice weight gain.
🐾Weigh your cat every two weeks at the same time of day.
🐾If feeding wet food too, subtract its calories from the dry portion.

Calculate your cat's age too

🐱 Cat Age Calculator Cat MBTI Test