Another oddity about BMI is that it doesn't make any logical sense when you look at units. Engineers like dimensionless numbers, because these can be used irrespective of scale (think angle of attack, lift coefficient, Reynolds number, etc.) The BMI is not even close to dimensionless, having units of kg/m^2. Assuming that people are approximately equally dense (we all just about float), and more or less similarly built, mass should be close to proportional to length^3, which would give BMI the unit of Length. So it is little wonder that tall guys battle with BMI. So yes, it is Bl**dy Misleading Info.