Body mass index (BMI) = weight (kg) ÷ square of height (m)
For example, a person's height is 1.70 meters and his weight is 60 kilograms. This person's body mass index (BMI) is:
Body mass index = 60 (1.70 *1.70) = 20.7612.
The body mass index of healthy weight is18.5-24.9;
Body mass index of 25-28 years old is overweight;
Above 28 is obesity, below 18.5 is emaciation;
The ideal body mass index is 22.
Who calculation method
Male: (height cm-80) × 70% = standard weight.
Standard weight plus or minus 10% is normal weight.
Standard weight plus or minus 10 ~ 20% overweight or underweight.
Obesity or underweight is defined as plus or minus 20% of standard weight.
Overweight calculation formula
Overweight% = [(actual weight-ideal weight)/(ideal weight) ]× 100%