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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 heaviest whale ever recorded weighed in at approximately 190 metric tons (210 short tons). The longest whales ever recorded were two females measuring 33.6 and 33.3 metres (110 and 109 ft), although in neither of these cases was the piecemeal weight gathered.