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BMI FORMULA

Find the corresponding BMI-for-age percentile for the child’s age and gender on the BMI chart.

BMI Formula

Description

Calculate the BMI as follows:
BMI = weight (kg) ÷ (height (m) x height (m))
OR
BMI = weight (kg) ÷ (height (cm) ÷ height (cm) x 10000)

Example: Ten-year-old Sarah weighs 40kg and is 137cm tall.
Sarah’s BMI - 40 ÷ 137 ÷ 137 x 10000 = 21.3

BMI Calculation

Height type:
Weight: kg
Height:

Find the corresponding BMI-for-age percentile for the child’s age and gender on the BMI chart. This percentile shows how the child’s weight compares to that of other children of the same age and gender. In our example, Sarah’s BMI-for-age percentile falls above the 90th percentile, meaning that her weight is greater than that of 90% of other children of the same age and gender.

Interpretation of BMI for Children

Underweight Less than the 5th percentile
Healthy weight 5th percentile up to the 85thpercentile
Overweight or at risk of becoming overweight Equal to or greater than the 85th percentile

Fat Percentages

Most people now understand that to have a healthier body means to have a fat percentage that falls within the recommended ranges. Many methods exist to determine body fat percentages, including Underwater Weighing, Callipers (Skinfold Measurements), X-ray methods including Magnetic Resonance Imaging (MRI) and Bio-Impedance measurement. Most of these measures require a professional and may be costly.

There is however a formula that can be used to estimate fat percentage by using BMI, age and gender. However, since an important factor such as bone structure is not taken into account in this formula, you should only use it as a general guideline and rather consult your medical practitioner if you are concerned about your child’s body fat percentage.

Body Fat Percentage Formula

Child Body Fat % = (1.51 x BMI) - (0.70 x Age) - (3.6 x gender) + 1.4
where male gender= 1, female=0

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