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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)
Rating Newest Oldest. Best Answer: At birth a male blue whale will weigh about 26 Tons, a full grown adult male blue whale is about 100-120 Tons. Females have weighted in at over 135 Tons. The largest female blue whales have weighted almost 200 tons!he weight of a 30 m (98 ft) individual is believed by the NMML to be in excess of 180 tonnes (200 short tons). The largest Blue Whale accurately weighed by NMML scientists to date was a female that weighed 177 tonnes (196 short tons).[6]. Inferno786 Â· 8 years ago. Thumbs up.