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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)
In comparison the blue whale (the worlds largest living animal) can grow to a length of over 100 ft. and weigh in excess of 150 tons. The blue whales heart alone can weigh as much if not more than a fully grown dwarf sperm whale.In fact some of the largest blue whales have had hearts that weigh as much as 2,500 lbs., which is equivalent to the weight of a small car.actors affecting a whales weight and size. When it comes to a whales overall weight there are a number of factors that help determine how much a whale will weigh. Some of these factors include: 1  How healthy, genetically fit and large the whales parents were/are.