Quick answer
Adult northern elephant seals typically weigh around 900 kg and reach roughly 3.5 m long.
Size and weight
Adults average 900 kg and 3.5 m length; males are often larger.
Growth
Juveniles grow quickly in the first years of life.
Record sizes
Exceptional individuals may exceed typical ranges.
Size and ecology
Body size influences diet, predators, and habitat use.
Sources
FAQs
How big is a northern elephant seal?
Roughly 900 kg and 3.5 m long.
Are male northern elephant seals bigger than females?
Often yes, though it varies by species.
How does size compare to similar animals?
Use our compare tool for side-by-side stats.
At what age are northern elephant seals fully grown?
Varies — many reach adult size within a few years.