Home / Cat breed size chart / Siberian
Siberian size
The Siberian is a large cat and one of the slowest-maturing breeds. Males usually weigh 12–20 lb (5.4–9.1 kg) and females 8–12 lb (3.6–5.4 kg), and they can take 3–5 years to reach full size. Enter your cat's weight to see how it compares.
You'll see where your cat sits in the usual Siberian 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 Siberians get?
Breed registries and vet sources don't agree exactly, so here is what each one says about adult weight:
| Source | Males | Females |
|---|---|---|
| CFA | 12–18 lb | 8–12 lb |
| VCA | 12–20 lb, some up to 25 lb | 12–20 lb (all adults) |
| Purina | 8–17 lb (all adults) | 8–17 lb (all adults) |
Based on these figures, the size checker uses 12–20 lb (5.4–9.1 kg) for males and 8–12 lb (3.6–5.4 kg) for females. Ranges a source gives for all adults are shown for reference.
When do Siberians stop growing?
CFA says most Siberians reach full size by 3 years, though its breed standard allows up to 5, and calls the Siberian one of the slowest-maturing cat breeds. TICA and VCA say up to 5 years. Siberians keep filling out after their first birthday, so a 1-year-old can still be well below its adult weight.
There is no published month-by-month growth chart for Siberian 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.
Siberian size facts
- TICA notes that female Siberians are considerably smaller than males.
Siberian 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 Siberians get?
Males usually weigh 12–20 lb (5.4–9.1 kg) and females 8–12 lb (3.6–5.4 kg), and they can take 3–5 years to reach full size.
How much should a male Siberian weigh?
Sources give 12–20 lb (5.4–9.1 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 Siberian weigh?
Sources give 8–12 lb (3.6–5.4 kg) for adult females. Females are usually smaller than males.
When is a Siberian full grown?
Siberians can take 3–5 years to reach full size, according to the breed sources above. Most of the growth happens in the first year.
Is my Siberian 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 Siberian?
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.