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BMI Calculator

Sex

Height

Weight

 

BMI

Population Average

Classification

Instructions

Enter information in height and body weight column; select appropriate gender and measurement units. Click "Calculate".

Body mass index (BMI) can be used to screen patients because the test is simple, correlates to fatness, and applies to both men and women.  The BMI may not apply to some individuals with more than normal muscle mass and acceptable levels of body fat. In some ethnic groups, such as Pacific Islanders, BMI overestimates fatness and risk. For children and the elderly, BMI may be misleading since the muscle and bone to height relationship is changing.

BMI Key
< 18.5 underweight
18.5 to 24.9 healthy
25 to 29.9 overweight
 30 to 34.9 grade 1 obesity
35 to 39.9 grade 2 obesity
>40 grade 3 (morbid obesity)

BMI can be used with body composition to assess fat free mass:

  • Fat free mass is low if BMI is low and body fat is high (if =<BMI & >BF, then <FFM)
  • Fat free mass is high if BMI is high and body fat is low (if =>BMI & <BF, then >FFM)

ACSM (2001).  ACSM's Resource Manual for Guidelines for Exercise Testing and Prescription, 4th ed., pg 7.

World Health Organization (1997).  Obesity: preventing and managing the global epidemic.  Report of a WHO consultation on obesity. Geneva.

Welborn TA, Dhaliwal SS, & Bennett SA (2003).  Waist-hip ratio is the dominant risk factor predicting cardiovascular death in Australia.  The Medical Journal of Australia; 179 (11/12): 580-585.








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