01 January 2009


This morning, i was surfing the web, and came upon this ad... what Rubbish!

Now, BMI is calculated using ones weight (actually mass) in kilograms, and height in metres.

This, however asks for height in feet and inches, and weight in stones and pounds, now this is a recipe for disaster...
a) Accuracy.. height in feet and inches is not as accurate as height in cm or(metres to two decimal places.) Also, weight in kg is more accurate because you can say,for example 72.3kg, but with stones and pounds, the smallest unit you can use is the pound.
b) Conversion.. how are we sure that they're converting to the most accurate degree? .. you can't.
The UKMA's blog Metric Views has a rather interesting article about the problem of using imperial weights.

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