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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)
A whales size can vary greatly depending on its species. The largest of the whale species is the blue whale which can grow to an average length of 70 â 90 ft. and weigh an average of 100 â 150 tons, however in some cases the blue whale has measured in at over 100 ft. in length and weighed more than 180 tons.