I quit smoking last your (well just about, 28 December 2007) and at the time I weight about 18st, (252lb, 114.5kg) since then I have gradually gained weight reaching a current total of 20st 8lb (288lb, 131kg). My height is 5' 10" (70", 178cm).
I looked up BMI at the time and was shocked to find it was above 40 (actually it was 41.41) which is considerably over the standard limit. So I wanted to know how the BMI was calculate, just to prove that bit sticking out in front of me was actually fat.
Being mathematical I wanted to know how the BMI was calculated, then a very kind American friend (he said I was not that overweight) say how was the BMI (body mass index) calculated.
So here's how the BMI is calculated KG / M^2.
That's probably Greek to most people as we say in the England. So I've decided to explain the calculation at least in English:
Height : Ft ' In ', this will require a translation to metric metres, its not that difficult
(ft * 12) + In, so for me that (5' * 12 ) + 10" = 70" now multiply this by 0.0254 ( that the number of inches in a metre) = 1.778 (fig A)
Weight : St (Stone) Lb (Pounds), Ok so I was (20st 8lb, in US that (20 * 14 (Lb per St is 14)) plus the Lb ( 8 lb )= 288lb (fig B)
So to convert this to metric its simply a case of Lb / 2.2 which gives you Kg (so in my case its 130.9kg, fig C)
BMI (Body Mass Index) : The formula is simple its Kg / M^2, but again lets just explain how to work that out
In simple form its ( fig C / ( fig A * fig A) ) = BMI
So using my calculation above this is :
Weight (130.9Kg, fig C) / (1.778, fig A * (multiplied by) 1.778, fig A which gives 3.1612) and a final BMI of 41.40
Or to show it just as my weight this is = 130.9+(1.778*1.778) = 41.40 BMI
So for:
UK people its ( Weight (Kg) * ( (Height cm / 100 ) * (Height cm / 100 ) ) )
US people its ( Weight (lb) / 2.2 ) * ( Height ( ( ( ft*12) + In ) * 0.254 ) * Height ( ( ( ft*12 ) + In ) * 0.254 ) )
No matter how you look at it, I am fat!!
Do I care, well yes, I actually feel uncomfortable with my weight so I'm doing something about it.
I'll keep my blog posted about how my weight loss is going.