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.

Enter Child's Information


2 “Bad” Habits That Could Prevent Allergies 

Oral habits in children could have an unexpected benefit.

Managing Kids with Oppositional Defiant Disorder 

Coping strategies for parents of children with ODD.

Caring for a Baby Born with a Defect 

When your infant arrives with a problem, don’t despair.

Bedwetting (Nocturnal Enuresis) Is Common  

Nocturnal enuresis tends to decrease as a child’s body grows, but until then they need emotional support.

Coming to Your Child’s Emotional Rescue 

Chronic illness and disabilities can affect everyone in your family. Here’s how to help your child manage his feelings.

Laundry Detergent Packets Put Children in Danger 

Exposure to laundry detergent packets sends thousands of kids to the ER each year, some with life-threatening complications.

How to Tell If Your Child Has a Concussion 

Head injuries in children can be dangerous if left undiagnosed, and many are underreported.

Teaching Kids Martial Arts 

It’s far more than learning how to break a board.

Cases of Mysterious Polio-like Illness Continue to Grow 

The U.S. has been polio-free for almost 40 years, but increasing reports of this mysterious polio-like illness are on the rise.

Toxic Chemicals in Childhood 

How to minimize kids’ exposure to bisphenol A (BPA) and its replacements — as well as a group of chemicals called phthalates.

What Do You Know About Cystic Fibrosis?

Cystic fibrosis (CF) is an inherited disease that mostly affects the respiratory and digestive systems. About 30,000 children and young adults in the U.S. have CF. Most of them are descendants of people from northern Europe. Find out more about CF by taking this quiz, based on information from the National Institutes of Health.

1. CF affects which body system?