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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)
Long ago, Antarctic blue whales measured 30.5 m (100 ft.) and weighed 145,280 kg (320,000 lb.). Whale hunters took the most massive whales - the biggest blue whales today measure about 26 m (85 ft.), but lengths of 21 m (70 ft.) are more common.