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BMI can be calculated using either the metric system or the English
system. A hand-held calculator or the CDC Table for Calculated Body Mass
Index Values for Selected Heights and Weights for Ages 2 to 20 can be
used. With the metric system, the formula for BMI is weight in kilograms
divided by height in meters squared. Because height is commonly measured
in centimeters, an alternate calculation formula is to divide weight in
kilograms by height in centimeters squared, and then multiply the result
by 10,000.
When using a hand-held calculator: if your calculator has a
square function, divide weight (kg) by height (cm) squared, multiply by
10,000 and round to one decimal place; if your calculator does not have a
square function, divide weight by height twice as shown in the calculation
formula above, multiply by 10,000 and round to one decimal place.
Calculations for BMI can be completed as a continuous equation.
Example: a child has a weight of 16.9 kg and height of 105.4 cm.
When the calculations are completed we find his BMI to be 15.2.
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