Can this tool be used for adults or children under age 2?

No, the NHS calculator is specifically designed for children and teenagers aged 2 to 17. Adults should use the BMI for adults calculator, and children under 2 should consult a GP or health visitor.

Does the calculator provide body fat percentage or muscle assessment?

No, the tool does not tell the difference between muscle and fat, nor does it give a body fat percentage. It only provides a BMI value and weight category.

Is the result a diagnosis or medical advice?

No, the BMI calculator does not diagnose conditions. If you are worried about a child's weight or growth, contact a health visitor, school nurse, or GP surgery for professional guidance.

Can the tool be used without a parent or carer present?

The NHS recommends using this calculator with a parent or carer if the child is aged 17 or under, as they can help interpret the results and provide appropriate next-step advice.

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BMI Calculator for Teens

Provided byNHSnhs.uk

This NHS calculator is designed for children and teenagers aged 2–17. It asks for age, sex, height, and weight, then ...

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About this tool

What BMI Calculator for Teens does

The NHS BMI Calculator for Teens determines body mass index for children and young people aged 2 to 17 using age, sex, height, and weight. It outputs a BMI value mapped to CDC percentile categories, indicating whether the result is underweight, healthy weight, overweight, or obese. The tool is designed to be used with parental involvement for those under 17 and provides guidance on next steps rather than a simple number. It is free to use and does not require a paid subscription, making it accessible for families seeking a quick health check within the UK health system.

Step by step

How to use the NHS BMI Calculator for Teens

1
Enter the child's date of birth to calculate age
2
Select the child's sex at birth
3
Input the child's height and weight using supported unit formats
4
Submit the data to receive BMI percentile and category

Is it right for you

Best for

Parents, carers, or guardians in the UK who need a free, quick assessment of a child's weight category and advice on next steps, particularly those who prefer metric or imperial units.

Limitations

Results are based on CDC percentile growth charts and may not reflect individual muscle mass
Does not account for ethnic background or physical activity levels
Not suitable for diagnosing medical conditions or assessing adults

Questions

BMI Calculator for Teens FAQ

Can this tool be used for adults or children under age 2?: No, the NHS calculator is specifically designed for children and teenagers aged 2 to 17. Adults should use the BMI for adults calculator, and children under 2 should consult a GP or health visitor.
Does the calculator provide body fat percentage or muscle assessment?: No, the tool does not tell the difference between muscle and fat, nor does it give a body fat percentage. It only provides a BMI value and weight category.
Is the result a diagnosis or medical advice?: No, the BMI calculator does not diagnose conditions. If you are worried about a child's weight or growth, contact a health visitor, school nurse, or GP surgery for professional guidance.
Can the tool be used without a parent or carer present?: The NHS recommends using this calculator with a parent or carer if the child is aged 17 or under, as they can help interpret the results and provide appropriate next-step advice.

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