The weight of a bear depends on the type of a bear.
But if we're talking about a black bear they can weigh in at 660 lbs when they're full grown and they can kill a person very easily so never get too close to a bear and especially a black bear.
Other bears weigh around 220 to 300 lbs depending on the type of bear.
A brown bear can weigh even more as most brown bears weigh at least 1,330 lbs so you certainly don't want to get into a fight with a brown bear that weighs almost 1 ton.