What Is BMI


Your BMI (body mass index) is a measure that uses your height and weight to estimate if your weight is within a healthy range.

The BMI calculation divides an adult's weight in kilograms by their height in metres squared.


For example, A BMI of 25 means 25kg/m2.

(source: NHS)

What Does BMI Mean


For most adults, an ideal healthy BMI is within the 18.5 to 25 range.

For children and young people aged 2 to 18, the BMI calculation will not be accurate.


If your BMI is:

  • Below 18.5 – you're in the underweight range.

  • Between 18.5 and 25– you're in the healthy weight range.

  • Between 25 and 30– you're in the overweight range.

  • Between 30 and 40– you're in the obese range.

The Accuracy Of BMI


BMI does take into account variations in body shape/size, giving an estimated healthy weight range for a particular height.

However, BMI is not the only factor that is taken into account when assessing if your a healthy weight.

Also, muscle is much denser than fat, so muscular people may actually be a healthy weight even though their BMI is classed as obese.

You should not use BMI as a measure if you're pregnant. This calculator is not set-up for people under the age 18.

Always consult with a qualified healthcare professional prior to beginning any diet or exercise program or taking any dietary supplement.


The content on our website is for informational and educational purposes only and is not intended as medical advice or to replace a relationship with a qualified healthcare professional. See our Terms & Conditions for more details.

© 2021 Real Muscle™. All rights reserved.

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