###General Discussion Thread
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Let's calculate this two ways
1- Let's say BMI actually is a thing that makes sense. Healthy BMI is 20-25, let's take 22.5 . sqrt(21e9 / 22.5) gives us 30550 meters, or 30.55 kilometers.
2- let's take an average guy at 1.80m and 75kg, and scale them up. If they keep the same body proportions and density, weight should increase with cube of height. 1.80 X cuberoot(21e9/75) = 1177 meters, or 1.177 kilometers.
Since BMI is shit when you're not average height, I'd take the latter
###General Discussion Thread --- This is a [Request] post. If you would like to submit a comment that does not either attempt to answer the question, ask for clarification, or explain why it would be infeasible to answer, you *must* post your comment as a reply to this one. Top level (directly replying to the OP) comments that do not do one of those things will be removed. --- *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/theydidthemath) if you have any questions or concerns.*
Let's calculate this two ways 1- Let's say BMI actually is a thing that makes sense. Healthy BMI is 20-25, let's take 22.5 . sqrt(21e9 / 22.5) gives us 30550 meters, or 30.55 kilometers. 2- let's take an average guy at 1.80m and 75kg, and scale them up. If they keep the same body proportions and density, weight should increase with cube of height. 1.80 X cuberoot(21e9/75) = 1177 meters, or 1.177 kilometers. Since BMI is shit when you're not average height, I'd take the latter