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BMI Calculator for Children and Teens

Body mass index (BMI) is one way to estimate a person's body fat that takes into consideration the person's height. BMI is calculated using a person's weight and height. In children and teens, BMI is used to find out if a child or teen is underweight, of a healthy weight, overweight, or obese. A child's body fat changes with age. Also, girls and boys differ in their amount of body fat as they mature. This is why BMI for children, also known as BMI-for-age, includes gender and age.

This calculator gives an approximate BMI for children from ages 5 to 18. It will tell you if a child is underweight, at an ideal weight, at risk of being overweight, or is now overweight.

Enter child's information

This calculator is not intended to replace the evaluation of a healthcare professional.

Online Medical Reviewer: Adler, Liora C, MD
Online Medical Reviewer: Bass, Pat F III, MD, MPH
Date Last Reviewed: 4/1/2021
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