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 licence), re-checked weekly against the same query. See how every number on this site is sourced.
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 licence, re-checked here every week.
Why is there a range instead of one weight?
Because the source publishes a range. Weight varies within any breed with sex, genetics and health, and a mixed-breed cat usually falls between its parents' breeds. Narrowing about 11 lb down to a single number would look more precise while being less true.
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
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.