Definition

Understanding Body Mass Index (BMI)

Choose a preferred language

Body mass index (BMI) is a way to figure out your weight category. It uses the ratio of your height to your weight. BMI is a measure of your weight that is corrected for height. Knowing your BMI is a way to tell if you are at a healthy weight, underweight, or overweight. The higher your BMI, the greater your risk for weight-related health problems.


What BMI means for adults

  • BMI below 18.5: Underweight

  • BMI 18.5 to 24.9: Healthy weight or ideal body weight 

  • BMI 25 to 29.9: Overweight

  • BMI 30 and over: Obese

  • BMI 40 and over: Severe obesity 


Use an online tool

Go online and search for BMI calculators. Try the Centers for Disease Control and Prevention (CDC) website. Or go to the American Cancer Society website. Both have online BMI tools.


Using the BMI chart

To figure out your BMI, find your height and weight (or the numbers closest to them) on the table below. Follow each column of numbers to where your height and weight meet on the table. That is your BMI.

Body Mass Index table showing BMI numbers for height and weight.

Featured in

Online Medical Reviewer: Raymond Turley Jr PA-C

Online Medical Reviewer: Sravani Chintapalli Researcher

Date Last Reviewed: 04/01/2025

© 2000-2026 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
Related Articles
Read article
Orthopedics
When Your Child Needs Surgery: Anesthesia

During surgery, your child will receive anesthesia. This is medicine that causes your child to relax or fall asleep, and not feel pain during surgery. See below for more information about different types of anesthesia.

Read article
Surgery
Wound Check After Surgery: Bleeding

It is normal to have some clear or bloody discharge on the wound covering or bandage for the first few days after surgery. Bleeding or discharge needing frequent dressing changes can be a sign of a problem. Read on for details.

Read article
Ear, Nose, and Throat
Tonsil, Adenoid, and Ear Tube Surgery: Preparing for Surgery

Here are some things that you'll need to do before your child's surgery.

Read article
Urology
When Your Child Needs Bladder Reconstruction Surgery

Your child is having surgery on their bladder. You may feel scared for your child and have many questions. This is normal. Learn what to expect with the surgery and discuss any questions or concerns you may have with your child's healthcare provider.