Siamese Weight & Size
How big does a Siamese get?
A full-grown Siamese weighs around 11 lb as an adult.
- Adult weight
- around 11 lb
- Also in kilograms
- around 5 kg
This weight comes from Wikidata's breed data (CC0 license), re-checked weekly against the same query. See how every number on this site is sourced.
Siamese Size
There is no size class on this page, and that is deliberate. Dog breeds have a widely used small/medium/large/giant convention; we found no equivalent published classification for cats. So the honest answer to how big a Siamese gets is the weight above — around 11 lb — and nothing more precise than that.
Common questions
How much does a full-grown Siamese weigh?
A Siamese weighs about 11 lb (5 kg) as an adult. That is the mass Wikidata publishes for the breed under a CC0 license, re-checked here every week.
Why is there one weight instead of a range?
Because that is what the source publishes for this breed — a single adult mass, not a span. Real Siameses still vary with sex, genetics and health, so read about 11 lb as the middle of a spread this source does not put numbers on. We don't invent the edges.
Does this page say what size class the Siamese is?
No, and that is deliberate. Dog breeds have a widely used small/medium/large/giant convention; we found no equivalent published classification for cats. Rather than invent one, this page gives the weight and stops there.
Breeds of a similar size
Every cat calculator
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- Kitten Feeding Calculator — How much to feed a kitten, by weight
- Kitten Age Calculator — How old your kitten is, estimated from its weight
- Kitten Growth Chart — What a kitten weighs at each age, from a published study
Weight varies within the Siamese by sex, genetics and health, and mixed-breed cats fall between their parents. This is a typical range, not a guarantee.
Verified on . Based on Wikidata — cat breed mass (property P2067) (Wikimedia Foundation, query run 2026-07-28, CC0 license). See the method.