Cat Weight Calculator
Check whether your cat is a healthy weight for their breed and age — and, if they are still a kitten, how big they are going to get. Covers 36 breeds including mixed-breed domestic cats.
These ranges are typical values for the breed, not a diagnosis. A healthy weight depends on frame, build and health history — ask your vet about your own cat.
Track your cat's weight in the free PetNoter app
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How the calculator works
“The average cat weighs 4 kg” is true and almost useless. A Singapura-sized cat and a Maine Coon are both cats, and a number that fits one is a warning sign for the other. Breed is the single biggest factor in what your cat should weigh.
This calculator compares your cat against the typical range for their own breed at their own age, separated by sex — which matters more in cats than people expect, since males commonly run 1–2 kg heavier than females of the same breed.
9 breeds use published age-by-age weight tables, each with its own full weight chart page. The rest are estimated from the breed's published adult weight and a growth curve matched to how quickly that breed matures — those results are labelled as estimates when they appear.
Reading the result
Small changes matter far more in cats than in dogs. A kilo of extra weight on a 4 kg cat is the equivalent of a 70 kg adult carrying an extra 17 kg. Check the number against what you can see and feel:
- Ribs: you should feel them under a thin layer of fat without having to press.
- From above: there should be a slight inward curve behind the ribs, not a straight or bulging line.
- From the side: the belly should tuck up. A loose flap of skin swinging low on the belly is the primordial pouch — that is normal anatomy, not fat.
- Trend over time: unexplained weight loss is the signal to act on fastest in cats. Hyperthyroidism, diabetes and kidney disease all show up on the scale before they show up in behaviour.
Never put a cat on a crash diet. Cats that lose weight too quickly can develop hepatic lipidosis, a serious liver condition — any weight-loss plan should go through your vet.
You know the numbers. Now watch the trend.
A single weigh-in tells you very little — a chart of the last six months tells you everything. PetNoter keeps your cat's weight history in one place, free.
- Log a weigh-in in seconds and see the trend line
- Reminders for weigh-ins, vaccinations and vet visits
- Vet records, prescriptions and photos stored per pet
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Adult weight by cat breed
Typical adult weights for every breed in the calculator. Breeds with a linked name have a full age-by-age chart.
| Breed | Typical adult weight | Fully grown by |
|---|---|---|
| Abyssinian | 3.5–5 kg (male) | 12–18 months |
| American Shorthair | 5–7 kg (male) | 12–18 months |
| Balinese | 3.5–5 kg (male) | 12–18 months |
| Bengal Cat | 3.5–7 kg | 12–18 months |
| Birman | 4.5–6.8 kg (male) | 12–18 months |
| Bombay | 4–5.5 kg (male) | 12–18 months |
| British Shorthair | 4–8 kg | 3–5 years |
| Burmese | 4–6 kg (male) | 12–18 months |
| Chartreux | 5.5–7 kg (male) | 2–3 years |
| Cornish Rex | 3.5–4.5 kg (male) | 12 months |
| Devon Rex | 3–4.5 kg (male) | 12 months |
| Domestic Longhair (mixed breed) | 4–6.5 kg (male) | 12–18 months |
| Domestic Shorthair (mixed breed) | 4–6 kg (male) | 12–18 months |
| Egyptian Mau | 4.5–6.5 kg (male) | 12–18 months |
| Exotic Shorthair | 4–6.5 kg (male) | 12–24 months |
| Himalayan | 4–6 kg (male) | 12–24 months |
| Maine Coon | 4–8 kg | 3–5 years |
| Manx | 4–5.5 kg (male) | 12–18 months |
| Munchkin | 2.7–4 kg | 12 months |
| Norwegian Forest Cat | 6–9 kg (male) | 3–5 years |
| Ocicat | 5.5–7 kg (male) | 12–18 months |
| Oriental Shorthair | 4–6 kg (male) | 12–18 months |
| Persian Cat | 5–7 kg (male) | — |
| RagaMuffin | 6.8–9 kg (male) | 3–4 years |
| Ragdoll | 5–9 kg | 3–4 years |
| Russian Blue | 4.5–6.5 kg (male) | 12–18 months |
| Savannah | 5.5–11 kg (male) | 2–3 years |
| Scottish Fold | 3–6 kg | 12–18 months |
| Selkirk Rex | 4.5–7 kg (male) | 12–24 months |
| Siamese Cat | 3–5 kg | 12–18 months |
| Siberian | 5–9 kg (male) | 3–5 years |
| Somali | 4–5.5 kg (male) | 12–18 months |
| Sphynx Cat | 3.5–7 kg | 12–18 months |
| Tonkinese | 3.5–5.5 kg (male) | 12–18 months |
| Turkish Angora | 3.5–5 kg (male) | 12–18 months |
| Turkish Van | 5–9 kg (male) | 3–5 years |
Frequently Asked Questions
How does the cat weight calculator work?
Pick your cat's breed, sex and age, then enter their current weight. The calculator compares that weight against the typical range for a cat of that breed and age, tells you how far outside the range they are if they are, and shows the adult weight they are expected to reach.
How much should my cat weigh?
Most adult domestic cats sit between 3.5 and 5.5 kg (8–12 lbs), but breed changes that a lot: a Siamese is typically 3–5 kg (6.6–11 lbs) while a Maine Coon can healthily reach 8 kg (17.6 lbs). Use the calculator above for your breed, and check it against your cat's body shape rather than the number alone.
How much should my kitten weigh?
A useful rule for the first six months is that a kitten gains roughly 100 g (about 3.5 oz) a week, reaching around 0.45 kg (1 lb) per month of age. By six months most cats are near 60% of their adult weight. Select your breed and your kitten's age above for a breed-specific range.
When do cats stop growing?
Most breeds reach their adult weight between 12 and 18 months. The large semi-longhairs are the exception — Maine Coons, Ragdolls, Norwegian Forest Cats, Siberians and RagaMuffins keep filling out until three to five years old, so a two-year-old is often still below its final weight.
Is my cat overweight?
Use the body condition check rather than the scale alone. You should feel your cat's ribs under a thin layer of fat without pressing, see a visible waist when looking down from above, and see the belly tuck up rather than hang. A sagging primordial pouch low on the belly is normal and is not the same as being overweight. Even 1 kg of excess weight on a 4 kg cat is a 25% overload — enough to raise the risk of diabetes and joint disease.
Is this a substitute for veterinary advice?
No. These are typical ranges for each breed, not a diagnosis. Cats hide illness well, and sudden weight loss in particular is a common early sign of hyperthyroidism, diabetes and kidney disease. Any unexplained change is worth a vet visit.
Got a dog too?
Track your cat's weight in the free PetNoter app
4.8 · Free · Android & iOS