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When using English measurements, ounces (oz) and fractions must be
changed to decimal values. Then, calculate BMI by dividing weight in
pounds (lbs) by height in inches (in) squared and multiplying by a
conversion factor of 703.
When using a hand-held calculator, if your calculator has a
square function, divide weight (lbs) by height (in) squared, multiply by
703 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
above, multiply by 703 and round to one decimal place. Calculations for
BMI can be completed as a continuous equation. Note that the formula for
the latter calculation is on the CDC Clinical Growth Charts and will be
the calculation used in this module.
Example: A child's weight is 37 pounds and 4 ounces and his
height is 41 1/2 inches. First, convert ounces and fractions to decimals:
Weight of 37 lbs and 4 oz = 37.25 lbs (16 ounces = 1 pound so 4 oz/16 oz =
0.25). Height = 41.5 in. Then divide (37.25 lbs by 41.5 in twice) x 703 =
15.2
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