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Health Canada - Government of Canada
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Food & Nutrition

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.

*When entering your height in ft/in use an apostrophe ( ' ) ex: 5'8

To estimate BMI, locate the point on the chart where height and weight intersect. Read the number on the dashed line closest to this point. For example, if you weigh 69 kg and are 173 cm tall, you have a BMI of approximately 23, which is in Normal Weight.

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.

Last Updated: 2003-09-19 Top