How to workout BMI

Body Mass Index, or BMI is designed to show you a measure of your bodyfat based on your height and weight. 
It is very easy to work out and gives you a general idea of weather you are overweight, underweight, or average. So here is how it works, take your height in metres and your weight in pounds and then use one of the two formulas given below.

A person’s BMI is their Body Mass Index and it can be worked out in one of two ways. Either you can divide their weight in kilograms by their height in metres twice (1) , or you can use a more complex formula shown below(2).

1.       75kg divided by 1.8 metres = 41.66667 then divided by 1.8m again = a BMI value of 23.14

2.       Height in inches squared, then divide your weight in pounds by this your height squared, multiply by conversion factor of 703.

e.g 70.859 inches squared =5021.02, weight in pounds so 165, divided by 5021.02= 0.03286

 then multiply this by 703 =BMI value of  23.1

Your BMI is ranked on a scale to show weather you are overweight,  underweight or at a healthy weight for your height. The scale is shown below:

Under weight = <18.5

Normal, healthy weight = 18.5 -24.9

Overweight = 25-29.9

Obese = 30+

Clinically obese - 35+

However beware that this calculation is not overly accurate interms of body composition as it does not account for muscle mass at all. Infact when I was at 10% bodyfat and 84kg(see pic below) it told me that my BMI was 26.2 which is overweight.

Instead I prefer to use body fat readings to test my weight ans health but this BMI is a globally used formula that i thought may be of use so feel free to use it.