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BMI (Body Mass Index)

Find out what it is and how to calculate it!


Written by SpunOut | View this authors Twitter page and posted in health


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Figuring out your body mass index (BMI) is a common way to calculate if you are a healthy weight. It is calculated by using a formula of your weight, height and waist measurements.

However, it’s not entirely 100% accurate. Especially when you’re a young person, you are still growing and developing so BMI isn’t always the best way to see if you’re a healthy weight. You should check with your GP.

You can calculate your BMI (Body Mass Index) by dividing your weight in kilograms by your square height in metres (kg/m2).

You can check yours quick and easy, right here. A lot of chemists/pharmacies will have machines that can work out your BMI for you, but again, it’s important to keep in mind that your BMI is more of a guideline and not completely accurate. Take a look at this BMI chart to see where you are on the scale.

The World Health Organisation definition

  • A BMI greater than or equal to 25 is overweight
  • A BMI greater than or equal to 30 is obesity.
  • If your BMI is over 40, you are very obese (known as ‘morbidly obese’)

But it’s important to remember that the BMI calculation doesn’t take into account if you are particularly muscular (muscle weighs more than fat), or if you are going through puberty.

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Published September 12th, 2014
Last updated October 29th, 2015
Tags bmi body mass index healthy weight
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