Quick answer
Adult grey seals typically weigh around 230 kg and reach roughly 2.3 m long.
Size and weight
Adults average 230 kg and 2.3 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 grey seal?
Roughly 230 kg and 2.3 m long.
Are male grey 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 grey seals fully grown?
Varies — many reach adult size within a few years.