BMI for Children

BMI Calculator for Children and Teens

BMI for children and teens is interpreted differently than for adults. Instead of fixed BMI cutoffs, children's BMI is expressed as a percentile relative to other children of the same age and sex, using CDC growth charts.

Height

Weight

lbs

Sex

Age (optional)

years

Your BMI

Enter your details

Under-
weightNormalOver-
weightObese

Healthy weight range

Ideal weight (Hamwi)

BMI Prime

Ponderal Index

BMI Categories (WHO)

Category	BMI Range	Health Risk
Underweight	Below 18.5	Moderate
Normal weight	18.5 – 24.9	Low
Overweight	25.0 – 29.9	Increased
Obese Class I	30.0 – 34.9	High
Obese Class II	35.0 – 39.9	Very High
Obese Class III	40.0+	Extremely High

Medical disclaimer: BMI is a screening tool, not a diagnostic measure. Consult a healthcare professional for personalized medical advice.

BMI Calculator for Children and Teens — what you need to know

For children aged 2-19, BMI is interpreted using age- and sex-specific percentiles. Underweight is below the 5th percentile. Healthy weight is the 5th to 85th percentile. Overweight is the 85th to 95th percentile. Obese is at or above the 95th percentile. Always consult a pediatrician for evaluation.