First of all, I agree with you, that it is not a very accurate indicator of a true BMI measurement. Secondly, I had not thought about what units others may use because the book was American written and distributed, thanks for pointing that out. And finally, I only use the number as an indication of progress, not an actual reading of true BMI, only calipers can indicate that. Plus, I took the equations straight from the book, so if you have qualms with their formulated ways of arriving at a BMI % then write those authors. Thanks for the reply and taking a look at the script :)