Children's Health and Wellness

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

Gender: Male Female
Age:23456789101112131415161718 years01234567891011 months
Height: feet inches
Weight: lbs.
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This calculator is not intended to replace the evaluation of a healthcare professional.

Print Source: Fat and lean BMI reference curves in children and adolescents and their utility in identifying excess adiposity compared with BMI and percentage body fat. Weber DR. American Journal of Clinical Nutrition. 2013;98(1):49-56.
Online Source: BMI percentile calculator for child and teen, CDC
Online Source: Clinical growth charts, CDC
Online Source: About BMI for children and teens, CDC
Online Source: Measuring Children's Height and Weight Accurately At Home, CDC
Author: Lambert, J.G. M.D.
Online Editor: Sinovic, Dianna
Online Medical Reviewer: Adler, Liora C, MD
Online Medical Reviewer: Brown, Kim, APRN
Date Last Reviewed: 3/1/2017
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