Using BMI to Calculate Required Weightloss

Everyone has heard of body mass index (BMI) and except in muscular people it takes ones height and produces an appropriate weight range...

Normal is considered 18.5-25... Over 30 is obese.

Calculating BMI is relatively straight forward... Where W is weight in pounds and H is height in inches then (703 is a conversion factor from the metric system):

[W ÷ (H)2] x 703 = BMI

Well given that my BMI was 40.8 at my initial visit I decided to figure out what my weight should be based on the BMI calculation... For that I applied some of my high school algebra to produce the following equation:

W=(BMI ÷ 703) x (H)2

Given that I am 6'10" or 82 inches... Here are the various range boundaries...

BMI Weight
Current 40.8 390
Obese 30 287
High Normal 25 239
Low Normal 18.5 177

By a strict definition I would have to get to 239 lbs to no longer be considered overweight...

Originally posted 2008-11-12 07:32:57. Republished by Blog Post Promoter

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3 comments ↓
#1 CD on 07.09.10 at 8:04 am

One of the most economical and accurate ways to evaluate progress is Skin Calipers. If I weigh 225lbs. and I am 5’6, according to the height and weight scale I would be overweight; however, my body fat percentage is 8%!

#2 Chad Walls - Fitness Dude on 10.03.10 at 11:04 pm

The body mass index is usful if you are close to the mean of our population in height and muscle mass. The BMI will give a less accurate calculation the taller or shorter an individual is from the average. The smae is true for athletes with a large amount of muscle mass.

#3 Taylor on 01.07.12 at 9:31 am

I’m a personal trainer and I really don’t care for BMI at all. I never use it with clients, i like to track progress with before/after pics, circumference measurements, and skin calipers.

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