Respuesta :

In theory you need to know the persons hight and weight, however this is not the best measure for some people are just really muscular or there bones are a bit heavier. 
xkatex13
You need to know the person's height, weight, and the formula to calculate

BMI= kg/m^2

Your weight has to be in kilos
However, this isn't always accurate because a person can be all muscle and their BMI might consider them overweight. When in reality they aren't.

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