
6. Calculating BMI by using the English system
When using English measurements, ounces (oz) and fractions must be
changed to decimal values. Then, calculate BMI by dividing weight in
pounds (lb) by height in inches (in) squared and multiplying by a
conversion factor of 703.
When using a handheld calculator, if your calculator has a square
function, divide weight (lb) 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. (Note that this formula is printed on the
CDC Clinical Growth Charts, and it will be the calculation used in this
module).
For more detailed instructions, see
Use and Interpretation of
the WHO and CDC Growth Charts for Children from Birth to 20 Years of Age
in the United States.
