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Body mass index, or BMI is the measurement of choice for many physicians and researchers studying obesity. BMI is a measure of body fat based on height and weight. BMI equals a person's weight in kilograms divided by height in meters squared. (BMI=kg7/m²)
BMI correlates with body fat. The relation between fatness and BMI differs with age and gender.
Instructions for calculator
- Enter your height in feet and inches.
- Input your weight in stones and pounds.
- Click the Calculate button.
- Your BMI will appear in the BMI box.
Interpreting the data
The BMI ranges are based on the effect body weight has on disease and death.
| Risk of associated disease according to BMI and
waist Size |
| BMI |
Weight Category |
Waist less than or equal
to
40 in. (men) or
35 in. (women) |
Waist greater than
40
in. (men) or
35 in. (women) |
| 18.5 or less |
Underweight |
-- |
N/A |
| 18.5 - 24.9 |
Normal |
-- |
N/A |
| 25.0 - 29.9 |
Overweight |
Increased |
High |
| 30.0 - 34.9 |
Obese |
High |
Very High |
| 35.0 - 39.9 |
Obese |
Very High |
Very High |
| 40 or greater |
Extremely Obese |
Extremely High |
Extremely
High |
If your BMI is high, you may have an increase risk of developing certain diseases, including:
- Hypertension
- Cardiovascular disease
- Dyslipidemia
- Adult-onset diabetes (type II)
- Sleep apnea
- Osteoarthritis
- Female infertility
Other conditions, including:
- Idiopathic intracranial hypertension
- Lower extremity venous stasis disease
- Gastroesophageal reflux
- Urinary stress incontinence
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