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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)
Size. Adult fin whales are about 19 m long for males and 20 m for females, with a maximum of 25 m in males and 27 m in females. It is estimated that a 25-metre whale would weigh about 70,000 kg.