How big is a capybara?
A large adult capybara reaches about 1.3 metres (over 4 feet) in body length and can weigh up to roughly 65 kilograms (about 140 pounds), which makes it the heaviest rodent in the world. In practical terms, a big capybara stands at roughly knee to mid-thigh height on an adult human, is about as long as a Labrador, and can weigh as much as a grown person. There is no other rodent close to it in size.
Typical measurements
- Body length: around 106-134 cm (up to about 1.3 m).
- Shoulder height: roughly 50-62 cm.
- Weight: commonly about 35-66 kg (77-146 lb), with females often a little heavier than males.
- Tail: essentially none, just a small vestigial stub.
For comparison, the next-largest rodents, such as the beaver, top out far lighter, which is why the capybara wears the "world's largest rodent" crown without contest.
Built like a swimmer
The capybara's bulk is not just for show. Its barrel-shaped body, short powerful legs and partially webbed feet make it a strong swimmer that can stay submerged for up to about five minutes to escape predators. Eyes, ears and nostrils sit high on the head so it can keep watch while almost fully underwater, and it can even sleep afloat with just its nostrils breaking the surface. That semi-aquatic build is the whole point of the animal's size and shape.
Does size make them dangerous?
Despite being as heavy as a person, capybaras are calm, non-aggressive herbivores that pose little threat to people. Their size matters most for swimming, grazing and surviving predators, not for confrontation. You can find full measurements, lifespan and range in our capybara species guide. Keeping the wetlands these giants depend on intact is the best way to protect them, and you can help fund habitat protection in their home range across Brazil and Colombia.
Read the full Capybara wildlife guide for the facts, IUCN status and conservation context — or donate to WARN to help fund the local partners protecting this species.
