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body mass index (BMI)

The body mass index (BMI) is a value derived from the mass (weight) and height of a person. BMI is defined as body mass divided by the square of body height, and is expressed universally in units of kg / m2, as a result of mass in kilograms and height in meters.

Formula: weight (kg) / [height (m)]2

Example: 72 kg/(1.7) 2 = 24.9

Unit: Kg/ m2

BMI Categories:
Underweight = <1 8.5
Normal weight = 18.5–24.9
Overweight = 25–29.9
Obesity = BMI of 30 or greater



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