Body mass index

Body Mass Index (BMI)

According to the WHO, body mass index (BMI) is a tool that allows you to assess your overall degree of obesity. It shows, depending on your size, the weight range associated with the risks to health.

BMI (kg / m 2 ) is calculated from weight (in kg) divided by height (in m) squared. BMI = weight (kg) / height (m 2 ). The international overweight criterion is a BMI of 25, while that of obesity is a BMI greater than 30

Calculation of body mass index (BMI)

CutcmCutft in


  • Healthy weight ( BMI> 18.5)
  • Overweight ( BMI> 25)
  • Obesity class 1 ( BMI> 30)
  • Obesity class 2 ( BMI> 35)
  • Obesity class 3 ( BMI> 40) or massive obesity (morbid)

Classification based on body mass index

(Reference: International Obesity Task Force   (IOTF) )

CategoriesBMI (kg / m 2 ) *Risks of co-morbidities
Under the normal<18.5Low (but greater risk for other clinical problems including mortality)
Normal extent18.5-24.9low
overweight25.0-29.9Some risks
Obese> 30.0
Class I30.0-34.9high
Class II35.0-39.9Very high
Obese morbid
Class III> 40.0Extremely high

* Note: These values are independent of age and sex and correspond to the same level of adipose tissue from one population to another.

** Note: It is important to measure BMI and body fat distribution (waist circumference or hip-hip circumference ratio, etc.) to assess the risk of co-morbidities of obesity. An insufficient BMI <18.5 kg / m 2 represents a greater risk of developing other clinical problems. Free quote

Measure your waistline

Waist circumference is a marker of adiposity complementary to that of BMI. Measuring the waist circumference (abdomen circumference) allows, using a tape measure, to identify excess fat in the abdomen. When waist circumference is greater than 88 cm in women or 102 cm in men , it is considered that there is abdominal obesity. Abdominal obesity is associated with an increased risk of diabetes, hypertension, hypertriglyceridemia, and vascular disease.

DesirableIncreased riskHigh risk
<80cm<94cm> 80cm> 94cm> 88cm> 102cm
<32 “<37 “> 32 “> 37 “> 35 “> 40 “

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