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Body Mass Index (BMI) Calculator   

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Body Mass Index (BMI) Calculator
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Body Mass Index (BMI)

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. It is defined as the weight in kilograms divided by the square of the height in meters (kg/m2). For example, an adult who weighs 70kg and whose height is 1.75m will have a BMI of 22.9.

BMI = 70 kg / (1.75 m2) = 70 / 3.06 = 22.9

Table 1: The International Classification of adult underweight, overweight and obesity according to BMI

Classification BMI(kg/m2)
  Principal cut-off points Additional cut-off points
Underweight <18.50 <18.50
Severe thinness <16.00 <16.00
Moderate thinness 16.00 - 16.99 16.00 - 16.99
Mild thinness 17.00 - 18.49 17.00 - 18.49
Normal range 18.50 - 24.99 18.50 - 22.99
23.00 - 24.99
Overweight ≥25.00 ≥25.00
Pre-obese 25.00 - 29.99 25.00 - 27.49
27.50 - 29.99
Obese ≥30.00 ≥30.00
Obese class I 30.00 - 34.99 30.00 - 32.49
32.50 - 34.99
Obese class II 35.00 - 39.99 35.00 - 37.49
37.50 - 39.99
Obese class III ≥40.00 ≥40.00

Source: Adapted from WHO, 1995, WHO, 2000 and WHO 2004.

Note: BMI values are age-independent and the same for both sexes. However, BMI may not correspond to the same degree of fatness in different populations due, in part, to different body proportions. The health risks associated with increasing BMI are continuous and the interpretation of BMI grading in relation to risk may differ for different populations.

Disclaimer: This health tool is meant for educational purposes only. The information provided by food2goodhealth is not intended to replace the medical advice of your doctor or health care provider.
Please consult your health care provider for advice about a specific medical condition.


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