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Body Mass Index Tutorial
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Body Mass Index
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BMI Definition:
Body Mass Index is a statistical measure of the body fat scaled according to your ideal height and ideal weight.
It has five categories which are listed in the table below.
| Category | BMI range |
| Starvation | less than 15 |
| Underweight | from 15 to 18.5 |
| Normal | from 18.5 to 25 |
| Overweight | from 25 to 30 |
| Obese | greater than 30 |
Hence from the table BMI should always be less than 25.
BMI Formula:
Body mass index can be calculated in three units as SI, US and UK units.
SI Units:
BMI = weight(kg) / height²(m²)
US Units:
BMI = 703 X weight(lb) / height²(in²)
where,
1kg = 2.2lbs.
1cm = 0.39inches.
UK Units:
BMI = 6.35 X weight(kg) / height²(m²)
Example:
Consider a person's weight as 75kg and height as 157cm. Calculate BMI for the person.
SI Units = weight(kg) / height²(m²)
= 75 / (15.7)²
= 30kg/m²
US Units = 703 X (weight(lb) / height²(in²))
= 703 X ((75X2.2) / (157X0.39)²)
= 30lb/in²
UK Units = 6.35 X weight(kg) / height²(m²)
= 6.35 X (75 / (15.7)²)
= 193kg/m²
Hence your category will be Obese.
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This tutorial will help you dynamically to find the BMI.
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