BMI Kids Calculator
Calculate BMI for children and teens aged 2-19 with CDC percentile interpretation.
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BMI
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Percentile Category
Recent Calculations
What Is BMI Kids?
BMI for children is interpreted differently than adults, using age and sex-specific growth charts to determine percentile rankings.
Formula
BMI = (weight in lbs × 703) / (height in inches)² — then compared to age/sex percentile chartsExample
A 10-year-old boy, 54" tall, 70 lbs has a BMI of 16.9, which is in the normal range.
Frequently Asked Questions
Why is kids' BMI different?
Children's body fat changes with age and differs between boys and girls, so BMI is compared to growth charts rather than fixed ranges.
What percentile is healthy?
5th to 85th percentile is considered healthy weight. Below 5th is underweight, 85th-95th is overweight, above 95th is obese.