Appendix B: The Chief Public Health Officer's Report on the State of Public Health in Canada 2012 – Body mass index cut-points

Appendix B: Body mass index cut-points

The body mass index (BMI) is a ratio of weight-to-height.Footnote 681

BMI = weight in kilograms/(height in metres)2

Table B.1 Body mass index for children and youth aged 2 to 17 years Footnote 204, Footnote 205
  Underweight cut-points

BMI less than or equal to:
Overweight cut-points

BMI greater than or equal to:
Obesity cut-points

BMI greater than or equal to:
Age (years) Boys Girls Boys Girls Boys Girls
2 15.14 14.83 18.41 18.02 20.09 19.81
2.5 14.92 14.63 18.13 17.76 19.80 19.55
3 14.74 14.47 17.89 17.56 19.57 19.36
3.5 14.57 14.32 17.69 17.40 19.39 19.23
4 14.43 14.19 17.55 17.28 19.29 19.15
4.5 14.31 14.06 17.47 17.19 19.26 19.12
5 14.21 13.94 17.42 17.15 19.30 19.17
5.5 14.13 13.86 17.45 17.20 19.47 19.34
6 14.07 13.82 17.55 17.34 19.78 19.65
6.5 14.04 13.82 17.71 17.53 20.23 20.08
7 14.04 13.86 17.92 17.75 20.63 20.51
7.5 14.08 13.93 18.16 18.03 21.09 21.01
8 14.15 14.02 18.44 18.35 21.60 21.57
8.5 14.24 14.14 18.76 18.69 22.17 22.18
9 14.35 14.28 19.10 19.07 22.77 22.81
9.5 14.49 14.43 19.46 19.45 23.39 23.46
10 14.64 14.61 19.84 19.86 24.00 24.11
10.5 14.80 14.81 20.20 20.29 24.57 24.77
11 14.97 15.05 20.55 20.74 25.10 25.42
11.5 15.16 15.32 20.89 21.20 25.58 26.05
12 15.35 15.62 21.22 21.68 26.02 26.67
12.5 15.58 15.93 21.56 22.14 26.43 27.24
13 15.84 16.26 21.91 22.58 26.84 27.76
13.5 16.12 16.57 22.27 22.98 27.25 28.20
14 16.41 16.88 22.62 23.34 27.63 28.57
14.5 16.69 17.18 22.96 23.66 27.98 28.87
15 16.98 17.45 23.29 23.94 28.30 29.11
15.5 17.26 17.69 23.60 24.17 28.60 29.29
16 17.54 17.91 23.90 24.37 28.88 29.43
16.5 17.80 18.09 24.19 24.54 29.14 29.56
17 18.05 18.25 24.46 24.70 29.41 29.69
17.5 18.28 18.38 24.73 24.85 29.70 29.84
Table B.2 Body mass index for adults aged 18 years and older Footnote 681
Classification BMI category (kg/m2) Level of health risk
Underweight < 18.5 Increased risk
Normal weight 18.5 – 24.9 Least risk
Overweight 25.0 – 29.9 Increased risk
Obese ≥ 30.0  
Obese class I 30.0 – 34.9 High risk
Obese class II 35.0 – 39.9 Very high risk
Obese class III ≥ 40.0 Extremely high risk
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