 What is an average size and weight of a grizzly? Grizzly bear and brown bear are the same animal. A brown bear on a coat, they'll get, I have to believe, that big ones, I've never weighed one personally, but a huge, huge coat of brown bear can be 1,500 pounds, probably a little more. Grizzly bears live more into the interior. They have shorter growing season, longer hibernation, not as good a food source.