Old BMI formula:
BMI = weight (kg) / height (m) ^ 2 = 703 * weight (lb) / height (in) ^ 2
New BMI formula:
NEW BMI = weight (kg) / height (m) ^ 2 = 703 * weight (lb) / height (in) ^ 2
For Example: 185cm 65kg
BMI = 18.99, Normal
NEW BMI = 18.15, Underweight
Of course, the human body is very complex. Bmi figures are reference values