Home / Cat breed size chart / Siamese
Siamese size
The Siamese is a medium-sized, slender cat. Males usually weigh 8–15 lb (3.6–6.8 kg) and females 5–12 lb (2.3–5.4 kg). Enter your cat's weight to see how it compares.
You'll see where your cat sits in the usual Siamese range.
Breed ranges are a guide, not a target: a healthy body shape matters more than the number on the scale. Last reviewed October 9, 2026.
How big do Siamese cats get?
Breed registries and vet sources don't agree exactly, so here is what each one says about adult weight:
| Source | Males | Females |
|---|---|---|
| TICA | about 8–12 lb | about 5–8 lb |
| Purina | 11–15 lb | 8–12 lb |
| VCA | 5–8 lb (all adults) | 5–8 lb (all adults) |
Based on these figures, the size checker uses 8–15 lb (3.6–6.8 kg) for males and 5–12 lb (2.3–5.4 kg) for females. Ranges a source gives for all adults are shown for reference.
When do Siamese cats stop growing?
Breed registries don't give a separate age for Siamese cats. Like most cats, they are usually close to adult size at about 12 months, and some keep filling out a little after that.
There is no published month-by-month growth chart for Siamese kittens from a breed registry or vet source, so we don't print one. For the first months, compare your kitten with the kitten growth chart, and use the kitten feeding chart to see how much to feed.
Siamese size facts
- CFA describes the Siamese as medium sized and svelte, with males that may be proportionately larger.
Siamese size compared with other breeds
| Breed | Males | Females | Full size by |
|---|---|---|---|
| Savannah | 11–25 lb | same range | about 3 years |
| Maine Coon | 12–22 lb | 9–15 lb | 3–5 years |
| Ragdoll | 15–20 lb | 10–15 lb | about 4 years |
| Siberian | 12–20 lb | 8–12 lb | 3–5 years |
| Bengal | 9–18 lb | 6–12 lb | about 2 years |
| British Shorthair | 10–18 lb | 8–15 lb | 3–5 years |
| Norwegian Forest Cat | 10–18 lb | 8–12 lb | up to 5 years |
| Siamese | 8–15 lb | 5–12 lb | about 1 year* |
| Persian | 9–14 lb | 7–11 lb | about 1 year* |
| Sphynx | 8–12 lb | 6–10 lb | about 1 year* |
| Average house cat | 8–12 lb | about 1 year | |
Weights are the overall ranges from the breed sources on each page. *No breed-specific age given; most cats reach adult size at about 12 months. The average house cat weighs about 8–12 lb (PetMD).
Questions people ask
How big do Siamese cats get?
Males usually weigh 8–15 lb (3.6–6.8 kg) and females 5–12 lb (2.3–5.4 kg).
How much should a male Siamese weigh?
Sources give 8–15 lb (3.6–6.8 kg) for adult males. Your cat's body shape matters more than the number: use the cat weight calculator to check its body condition.
How much should a female Siamese weigh?
Sources give 5–12 lb (2.3–5.4 kg) for adult females. Females are usually smaller than males.
When is a Siamese full grown?
Usually at about 12 months, like most cats. Breed registries don't give a separate age.
Is my Siamese overweight?
Breed ranges are wide, so check body shape instead: you should be able to feel the ribs easily and see a waist from above. The cat weight calculator uses the 9-point body condition score to estimate your cat's ideal weight.
How much should I feed a Siamese?
Base it on your cat's ideal weight and activity, not the breed. The cat food calculator turns that into calories and cans or cups.
Sources
- TICA: Siamese
- Purina: Siamese
- VCA: Siamese
- CFA
- UK Pet Food: Kitten factsheet
- PetMD: Average weight of cats