Ideal Cat Weight Calculator by Breed

Is your cat a healthy weight? Ideal weight varies a lot by breed — a Siamese may be healthy at 3 kg while a Maine Coon can be 7 kg or more. Pick your breed, enter the current weight, and the calculator shows a healthy range, a target weight and body-condition guidance.

How the ideal cat weight calculator works

The calculator compares your cat's current weight against a typical healthy range for the selected breed. If the weight sits below the range it flags underweight; within it, a healthy weight; above it, overweight — along with how far outside the range your cat is.

Numbers are only part of the picture: body condition score (being able to feel the ribs with a light fat cover and see a waist from above) matters just as much, so use the result as a guide to discuss with your vet.

How to use it

Choose your breed. Select your cat's breed, or 'Mixed / Domestic' for a typical house cat.
Enter current weight. Add the weight in kg or lb.
Calculate. See the healthy range, a target weight and tailored body-condition advice.

Key takeaways

Healthy weight is breed-specific — there's no single 'ideal' number.
Feel for ribs and look for a waist; body condition matters as much as weight.
Even small amounts of excess weight raise health risks in cats.

Frequently asked questions

What is a healthy weight for a cat?

For an average domestic cat it's about 3.6–5 kg (8–11 lb), but the healthy range depends heavily on breed and frame. Body condition score is just as important as the number on the scale.

How do I know if my cat is overweight?

You should be able to feel the ribs easily under a slight fat cover and see a waist from above. If the ribs are hard to feel and there's a rounded, sagging belly, your cat is likely overweight.

How much should my cat weigh by breed?

Ranges vary widely: Siamese ~2.7–4.5 kg, domestic ~3.6–5 kg, Persian ~3.2–5.5 kg, Ragdoll ~4.5–9 kg, Maine Coon ~5.9–8.2 kg. The calculator includes a breed selector.

Why does a little extra weight matter so much for cats?

Cats are small, so even a kilo of excess weight is a large share of body mass — raising the risk of diabetes, arthritis and urinary disease. Modest, vet-guided loss makes a real difference.