Simple BMI calculation

This is all about how to calculate BMI easily..
the output can be 3kg lesser or greater..

For Men,its
Health weight=(HEIGHT IN CM-WEIGHT IN KG)
ex: If yours height is 165cm,then (165-100)=65kg
So yours Healthy weight is 65kg

For Women,its
Health weight=(HEIGHT IN CM-WEIGHT IN KG)*(0.9)
ex: If yours height is 160cm,then (160-100)=60*(0.9)=54
So yours Healthy weight is 54kg