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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)
Females are smaller, 30 feet (9.15 m) to 40 feet (12.2 m) usually. A newborn calf is approximately 13 feet long (3.96 m). The weight of a forty foot sperm whale is about 17 metric tons (18.73 short tons or 37,540 lbs.). Early whalers estimated that larger whales weighed about a ton a foot but, with some lucky exceptions, this was mostly guesswork (Ellis, 1980).