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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)
The largest recorded male killer whale was 9.8 m (32 ft.) in length and weighed 10,000 kg (22,000 lb.) The largest recorded female was 8.5 m (28 ft.) and weighed 7,500 kg (16,500 lb.). 1  Data from Icelandic killer whales (North Atlantic type 1) indicate that an average-size female is 4.9 to 5.8 m (16-19 ft.).