Body Mass Index (BMI) Nomogram

This BMI nomogram is not intended for use with:

  • those under 18 years of age,
  • and pregnant and lactating women.

Visit the Question and Answer (Q & A) section for more information about weight classification and answers to questions about weight and health.

You can also calculate your BMI using this formula:

BMI = weight(kg)/height(m)2

Health Risk Classification According to Body Mass Index (BMI)
Classification BMI Category (kg/m2) Risk of developing health problems
Underweight < 18.5 Increased
Normal Weight 18.5 - 24.9 Least
Overweight 25.0 - 29.9 Increased
Obese class I 30.0 - 34.9 High
Obese class II 35.0 - 39.9 Very high
Obese class III >= 40.0 Extremely high

Note: For persons 65 years and older the 'normal' range may begin slightly above BMI 18.5 and extend into the 'overweight' range.

Source: Health Canada. Canadian Guidelines for Body Weight Classification in Adults. Ottawa: Minister of Public Works and Government Services Canada; 2003.

To clarify risk for each individual, other factors such as lifestyle habits, fitness level, and presence or absence of other health risk conditions also need to be considered.

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