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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)
Biology. 1  North Pacific Humpback Whales are the fifth largest whale species in the world, and can weigh anywhere between 25-40 tons (50,000-80,000 lbs), and approximately 1-ton (2,000 lbs) as newborns. They can grown up to 60-feet in length, the females being the larger sized of the breed.