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 health care professional.

Print Source: Body mass index as a measure of adiposity among children and adolescents: A validation study. Pietrobelli A. Journal of Pediatrics. 1998;132(2):204-10.
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.
Print Source: High Adiposity and High Body Mass Index for Age in US Children and Adolescents Overall. Flegal KM. American Journal of Clinical Nutrition. 2010;91(4):1020-6.
Print Source: Percentiles for body mass index in U.S. children age 5 to 17 years of age. Rosner B. Journal of Pediatrics. 1998;132(2):211-22.
Print Source: Prevalence of Obesity and Trends in Body Mass Index Among US Children and Adolescents, 1999-2010. Ogden CL. Journal of the American Medical Association. 2012;307(5):483-90.
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
Author: Lambert, J.G. M.D.
Online Editor: Sinovic, Dianna
Online Medical Reviewer: Brown, Kim, APRN
Online Medical Reviewer: Pierce-Smith, Daphne, RN, MSN, CCRC
Date Last Reviewed: 4/23/2015
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