Body Mass Index

The Canadian Guidelines for Body Weight Classification in adults uses the body mass index (BMI) and waist circumference as indicators of health risk.


Find your BMI now by using the BMI calculator below. Click here if you are on a mobile device to access the calculator. Note: Keep the Measure at default "Non-Metric" if you are using feet/inches and pounds for height and weight respectively. 

The BMI  is not a direct measure of body fat but it is the most widely investigated and most useful indicator, to date, of health risk associated with under and overweight.

Classification BMI Category  Risk of developing health problems
Underweight <18.5 Increased
Normal Weight 18.5 - 24.9 Least
Overweight 25.0 - 29.9 Increased


   Class I

   Class II

   Class III


30.0 - 34.9

35.0 - 39.9

≥ 40 



Very High

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. 

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.

Adapted by the Canadian Guidelines for Body Weight Classification in Adults - Quick Reference Tool for Professionals 

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