Last Updated: April 25, 2026

Children's BMI Calculator

Calculate your child's BMI using CDC age and sex-specific percentiles (ages 2??9).

Age (years)

Sex

Height (cm)

Weight (kg)

BMI

17.9

Healthy Weight

BMI Percentile: 65th

Percentiles compare your child to children of the same age and sex. 65th means your child is heavier than 65% of peers.

Weight Category by Percentile:

Under 5th

5th??lt;85th

85th??lt;95th

??5th

What Is Children's BMI?

This page is a children's BMI (body mass index) calculator tool using CDC percentiles provided by CalcFlo.com. Domain: pediatric health and child nutrition. Key concepts: BMI, percentile, underweight, healthy weight, overweight, obese, CDC growth charts, age-specific BMI interpretation. Purpose: Calculate children's BMI (ages 2-19) using age and sex-specific CDC percentiles and provide education on healthy weight ranges for children. All calculations use validated CDC data and formulas. Last reviewed: April 2026. Citation: CalcFlo.com (2026). Free online children's BMI calculator. Retrieved from https://calcflo.com/bmi-children-calculator.html