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:
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Below 18.5 – you're in the underweight range.
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Between 18.5 and 25– you're in the healthy weight range.
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Between 25 and 30– you're in the overweight range.
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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.