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Cat Calorie Calculator

Clear calorie and feeding estimates with transparent calculations.

Use this cat feeding calculator to estimate daily calories and a practical food portion from your cat’s weight, age, neuter status, body condition and activity.

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Choose your pet

Select the calculator that matches your pet.

Basic details

Body & lifestyle

Weight-management results are general starting guidance, not a medical weight-loss prescription.

Food details

YOUR PERSONALIZED PLAN

Intelligent Feeding Recommendation for Your pet

Resting Energy (RER)—kcal/day
Estimated Daily Energy—kcal/day
Food per day—grams
Food per meal—grams
Treat allowance—kcal maximum (10%)
Multiplier used—life-stage factor
SMART INSIGHTS

Why this plan fits your inputs

WELLNESS SNAPSHOT

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Based on 7 data points: species, age, weight, activity, body condition, food type and meals per day.

Important: This calculator provides general feeding estimates for healthy dogs and cats and is intended for educational purposes only. Individual calorie needs vary. Puppies, kittens, pregnant or nursing pets, animals with medical conditions, pets on therapeutic diets, or pets requiring significant weight change should be assessed by a qualified veterinarian.

How it works

  1. Enter your pet’s details
    Add your pet’s basic information, including weight.
  2. Tell us about your pet
    Select their body condition, lifestyle and food format.
  3. Get a personalised estimate
    See estimated daily calories, food quantity, meal portions and treat allowance—all in one place.

How we calculate

We first estimate Resting Energy Requirement (RER) using:

RER = 70 × body weight (kg)^0.75

We then apply a dog- or cat-specific life-stage multiplier to estimate daily energy needs. Food quantity is calculated using the calorie information on your pet-food label.

Results are starting estimates, because individual calorie requirements can vary.

Sources: Merck Veterinary Manual and WSAVA Global Nutrition Guidelines. ZyZig is not endorsed by, affiliated with, or officially associated with these organisations.

Practical example

A healthy, neutered 4 kg adult cat has an RER of approximately 198 kcal/day. Applying a 1.2 multiplier gives a starting daily estimate of approximately 238 kcal/day.

Factors that affect calorie needs

Calorie requirements can vary based on:

  • Age and life stage

  • Growth

  • Neuter status

  • Activity level

  • Body condition

  • Breed

  • Environmental temperature

  • Health status

Monitor your pet’s body weight and body condition regularly, and make significant feeding adjustments with veterinary guidance.

Reading pet-food calories

Look for metabolisable energy (ME) on your pet-food label. It may be listed as:

  • kcal per 100 g

  • kcal per cup

  • kcal per can or pouch

Select the matching food format in the calculator to get the most useful food-quantity estimate.

When to contact a vet

Speak with a qualified veterinarian if you have a puppy or kitten with unusual growth, a pregnant or nursing pet, significant weight change, illness, a therapeutic diet, persistent appetite changes, vomiting, diarrhoea, or other health concerns.

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Frequently asked questions

Is this calculator free?

Yes. It is free, requires no account and shows results instantly.

Are the results veterinary advice?

No. They are general educational estimates for healthy dogs and cats.

Where do I find food calories?

Check the packaging or manufacturer website for kcal per 100g, cup, can or pouch.

Why might my pet need a different amount?

Breed, age, neuter status, activity, body condition, environment and health can all affect energy needs.