BMI Calculator for Teens
Calculate BMI for a child or teen and see a general weight status category based on CDC age-and-sex growth chart ranges.
How teen BMI is calculated
The BMI formula itself is the same for everyone: BMI = Weight (kg) / Height (m)². What’s different for children and teens is how the result is interpreted — rather than fixed adult cutoffs, pediatric BMI is typically compared to age-and-sex-specific percentile growth charts (like those from the CDC), because a healthy BMI naturally changes as kids grow.
About this simplified category
This calculator shows a rough, simplified category rather than an exact percentile, since true pediatric percentiles require detailed CDC growth chart tables by exact age and sex. It’s meant as a general starting point, not a precise percentile calculation.
Growth and body composition vary widely and normally during childhood and adolescence. For an accurate percentile and any concerns about a child’s growth or weight, talk with a pediatrician, who can plot BMI on the correct growth chart and consider the full picture.