Body Mass Index Overview on Wikipedia
Wikipedia has a good overall description of Body Mass Index (BMI), including an inline BMI calculator that you can use to calculate your own BMI. The first two paragraphs are shown below. Click on the link at the bottom of the page to read more.
Body mass index (BMI) is a value derived from the mass (weight) and height of a person. The BMI is defined as the body mass divided by the square of the body height, and is expressed in units of kg/m2, resulting from mass in kilograms (kg) and height in metres (m).
The BMI may be determined first by measuring its components by means of a weighing scale and a stadiometer. The multiplication and division may be carried out directly, by hand or using a calculator, or indirectly using a lookup table (or chart). The table displays BMI as a function of mass and height and may show other units of measurement (converted to metric units for the calculation). The table may also show contour lines or colors for different BMI categories.
