BMI checker for children

Calculate BMI for children and teens with WHO percentile charts and health assessment

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About This Tool

This specialized BMI calculator is designed specifically for children and teenagers aged 2 to 20 years. Unlike adult BMI calculators, it accounts for age and gender differences in growth patterns using WHO growth reference data. The tool calculates BMI percentile, which indicates how a child's BMI compares to others of the same age and gender, providing a more accurate assessment of healthy weight status for growing children.

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How to Use

Enter the child's age in years
Select the child's gender
Choose measurement units (metric or imperial)
Enter height and weight
Click 'Calculate BMI' to see results
View BMI value, percentile, and health category

Frequently Asked Questions

Find Quick Answers

Why is child BMI different from adult BMI?

Children's BMI is interpreted differently because body composition changes with age and differs between boys and girls. Child BMI uses percentiles based on age and gender growth charts rather than fixed categories.

What age range does this calculator cover?

This calculator is designed for children and teenagers aged 2 to 20 years. For infants under 2, different growth charts are used.

What do the BMI percentiles mean?

Percentile indicates how a child's BMI compares to others of the same age and gender. Below 5th percentile: underweight; 5th to 85th: healthy weight; 85th to 95th: overweight; Above 95th: obese.

Is this calculator accurate for all children?

This calculator uses WHO growth reference data and provides accurate results for most children. However, it should not replace professional medical advice, especially for children with special health conditions.

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