The Office of Weights and Measures within the Commerce Department’s National Institute of Standards and Technology publishes standards for English and metric weights and measures.

The Metric System of Weights and Measures: an Address delivered before the Convocation of the University of the State of New York, at Albany, August 1, 1871. By Frederick A. P. Barnard., ...

The actual calculation is your weight (in kilograms) divided by your height (in metres) squared but it's also easy to read on the chart. BMI can be divided into several categories and generally ...