Body mass index is a calculation that uses your height and weight to estimate how much body fat you have. Too much body fat is a problem because it can lead to illnesses and other health problems. BMI, although not a perfect method for judging someone's weight.
| Category | BMI range |
|---|---|
| Severely underweight | less than 16.5 |
| Underweight | from 16.5 to 18.4 |
| Normal | from 18.5 to 24.9 |
| Overweight | from 25 to 29.9 |
| Obese Class I | from 30 to 34.9 |
| Obese Class II | from 35 to 39.9 |
| Obese Class III | over 40 |
