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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

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  1. Enter your height in feet and inches.
  2. Input your weight in stones and pounds.
  3. Click the Calculate button.
  4. 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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