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Food and Nutrition

Body Mass Index (BMI) Nomogram

The Java script version of the BMI nomogram has been temporarily removed. It will be made available as soon as possible.

Pregnancy Weight Gain Calculator

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.

BMI Chart

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.