BMI is a statistical measurement that let us know whether the person is under weight, normal weight or over weight.
BMI is categorized as below -
Category BMI
Underweight < 18.5
Normal weight 18.5 - 24.9
Overweight 25.0 - 29.9
Obesity class I 30.0 - 34.9
Obesity class II 35.0 - 39.9
Obesity class III > 40.0