Steller's sea eagle is the largest bird in the genus "Haliaeetus" and is one of the largest raptors overall. Females vary in weight from , while males being rather lighter with a weight range of . The average weight is variable, possibly due to seasonal variation in food access or general condition of eagles, but has been reported as high as a mean mass of to a median estimate weight of , excluding expired eagles that were poisoned by lead and endured precipitous weight loss by the occasion of their deaths.