Body Mass Index Calculator

I require a Body Mass Index (BMI) calculator for a website I am developing. Here are some examples: [login to view URL] [login to view URL] I particularly like this one: [login to view URL] I like the latter choice because it states whether your are underweight, of an ideal weight or overweight rather than just your BMI figure. The main different I would prefer is for the user to have the option whether to enter imperial or metric data. So, for weight either stones, kilos or pounds. For height, either feet and inches or meters and centimeters. Here is some information on how to calculate your BMI: [login to view URL](BMI) [login to view URL] The script could be javascript, php, html or ajax, as long as it is user friendly and meets the requirements. In summary, the user will enter their height (in feet and inches or meters and centimeters) and weight (in pounds and ounces or stones or kilos) and the calculator will output their BMI and if they are underweight, of an ideal weight or overweight. The coder will be required to implement the design into an existing template.