Polar bears are the largest land carnivores on Earth. Adult male polar bears typically weigh between 900 and 1,600 pounds and can reach lengths of up to 8 to 10 feet. In comparison, American black bears usually weigh between 200 and 600 pounds and are about 5 to 7 feet long. This means a large polar bear can be two to three times heavier than a typical black bear. Polar bears also have much larger paws and thicker fat layers to survive Arctic conditions, giving them a much bulkier appearance overall.