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Body mass index calculator
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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