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There are NBA players 7 feet (2.15m) tall who appear relatively slim and yet weigh 300 pounds (136kg) and more.

Is there a "rule of thumb" for estimating how much a man of greater height would weigh? I'm sure there isn't much empirical evidence about someone 8' tall, and even less of people taller yet, but what would be a "good guess" regarding the weight of a man 9'6" (3m) tall? That is, someone who was not skinny as the proverbial rail nor as corpulent as a Sumo wrestler (IOW, a "good average").

I'm sure it's not just a certain amount of weight per inch, because the taller a person is, the wider they would also tend to be, so any rule of thumb would probably be a graduated scale (the taller the person, the greater the weight gain per inch).

I'm guessing a 9'6" man would be at the very least 500 pounds (227kg), quite possibly 600 (273kg) or more.

Am I right?

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Consider this ideal weight calculator for example. For a 25 yo male with a height of 9'6'' (289 cm), the optimal weight should be around 342 - 462 pounds (155kg - 210kg).

By the way, the tallest man ever was only 8'11'' (272cm) tall (see here).

You might want to read about BMI

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    +1 but: The square-cube problem applied to the human body basically states that if you enlarge the human, the cross section of its muscles and bones would increase by the square of the scaling factor while its mass would increase by the cube of the scaling factor. In order to stem this weight (and for the whole circulatory and respiratory functions not to fail entirely), the body would have to change significantly. So the answer is correct, if we ignore the fact that you can’t just scale a human to ~3m as it would really mess up proportions.
    – Narusan
    May 31, 2018 at 23:07

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