Body mass index (BMI) is a worldwide renowned tool to assess a healthy weight. It establishes the ratio between height and body weight and determines standards for a healthy body weight, underweight, overweight or obesity.

Enter your height and weight

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More information on BMI

To obtain an appropriate assessment of what your healthy body weight should be, the body mass index must be paired with the assessment of your body fat percentage.

You should note that the body mass index was designed for sedentary people. This tool is not appropriate for active people or athletes because of the importance of their muscle mass.

Classification Results Risks of illnesses
Extreme thinness (underweight) Less than 16 High
Thinness Less than 18.5 Increased
Normal weight 18.5 to 24.9 Weak
Overweight 25 to 29.9 Increased
Class 1 obesity 30 to 34.9 High
Class 2 obesity 35 to 39.9 Very high
Class 3 obesity (morbid obesity) 40 and over Extremely high

Adapted from: “Lignes directrices canadiennes pour la classification du poids chez les adultes”.