The body mass index (BMI) uses your height and weight values to determine whether you are at risk for weight-related health problems such as diabetes, hypertension, heart disease, cancer or other medical complications.
Body mass index (BMI) provides a measure of weight-related health risk, based on height and weight.
| Classification | Body Mass Index | Risk |
| Underweight | <18.5 | Increased |
| Normal | 18.5 - 24.9 | Normal |
| Overweight | 25.0 - 29.9 | Increased |
| Obese 1 | 30.0 - 34.9 | High |
| Obese 2 | 35.0 - 39.9 | Very High |
| Obese 3 | > 40.0 | Extremely High |
Additional risks:
Large waist circumference (men >40 inches, women >35 inches).
Poor physical fitness.
Family history of obesity-related illnesses.
