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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 blue whale is 30 meters (98 feet) in length or 180 metric tons in weight. The tail of a blue whale is about 23 feet on a 72 ft. long whale so on a 100 ft. long whale the tail is about 30 ft long.