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A blue whale can weigh as much as 200 short tons (400,000 lbs). An adult blue whale can weigh up to around 180 metric tons (400,000lbs). A blue whale can weigh as much as 200 short tons (400,000 lbs).An adult blue whale can weigh up to around 180 metric tons (400,000lbs). A blue whale calve can weigh up to 2.7 metric tons (almost 6000lbs)
What is the size of a killer whale? A: According to Defenders of Wildlife, male killer whales grow up to 23 feet in length and weigh from 7 to 10 tons. Female whales grow up to 23 feet when fully grown and weigh anywhere from 4 to 6 tons. Continue Reading. Killer whales are typically slightly smaller than a bus when fully grown. A baby killer whale, known as a calf, weighs up to 400 pounds at birth. Newborn calves measure up to 7 feet. Although male killer whales are typically larger than females, the latter lead the mammals' family groups, which are called pods.