BMI Calculator

The body mass index (BMI) is a general guideline used by health professionals to help identify whether a person is a healthy weight or not. BMI shows the relation between body weight and height.

BMI classification for overweight and obese children and adolescents is different from that for adults. BMI for children incorporates age and gender which adult BMI cut-off points are derived from morbidity and mortality data.

A Rough Guide to BMI

BMI of between 18.5 and 24.9: Normal Weight
BMI of between 25.0 and 29.9: Overweight
BMI over 30.0: Obese

* The Body Mass Index serves as a general guideline. It is possible that a very muscular person would have a higher than normal BMI at a healthy weight. If you are concerned about you or your child’s health, please contact a qualified medical or health professional.

Calculate your body mass index

To find out your BMI, enter your height and weight. Select imperial (e.g. feet and inches) or metric (e.g. metres and cm) to select the units of measurement you want to use.

Age	A child is overweight if their BMI exceeds		A child is obese if their BMI exceeds
	Males	Females	Males	Females
8 yrs old	18.44	18.35	21.6	21.57
8.5 yrs old	18.76	18.69	22.17	22.18
9 yrs old	19.1	19.07	22.77	22.81
9.5 yrs old	19.46	19.45	23.39	23.46
10 yrs old	19.84	19.86	24	24.11
10.5 yrs old	20.2	20.29	24.57	24.77
11 yrs old	20.55	20.74	25.1	25.42
11.5 yrs old	20.89	21.2	25.58	26.05
12 yrs old	21.22	21.68	26.02	26.67
12.5 yrs old	21.56	22.14	26.43	27.24
13 yrs old	21.91	22.58	26.84	27.76
13.5 yrs old	22.27	22.98	27.25	28.2
14 yrs old	22.62	23.34	27.63	28.57
14.5 yrs old	22.96	23.66	27.98	28.87
15 yrs old	23.29	23.94	28.3	29.11
15.5 yrs old	23.6	24.17	28.6	29.29
16 yrs old	23.9	24.37	28.88	29.43
16.5 yrs old	24.19	24.54	29.14	29.56
17 yrs old	24.46	24.7	29.41	29.69
17.5 yrs old	24.73	24.85	29.7	29.84
18 yrs old	25	25	30	30

Adapted form Cole et al. (2000). British Medical Journal.

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