A person's BMI, or body mass index, is based on height and weight. It's often used to determine if a person is underweight, normal weight, overweight, or obese. But BMI doesn't consider muscle mass. Follow the links below to find WebMD's comprehensive coverage about how BMI is calculated, what it means, how to measure it with our innovative BMI Plus Calculator tool, and much more.
What Is Body Mass Index?
Learn how to use body mass index (BMI) to determine whether you are overweight.
Health Risks of Obesity
Being overweight or obese puts you at risk for many serious health conditions, including diabetes, sleep apnea, and even cancer. Learn more from WebMD about diseases you can prevent by losing weight.
Prescription Weight Loss Drugs
Pros and cons of 4 prescription weight loss drugs.
Obesity and When to Seek Help
WebMD explains obesity and how to take steps to lose weight.
Body Fat Measurement Comparing Percentage with Body Mass
What's the best body fat measurement to assess health risks from being overweight? Experts say BMI and body-fat percentage both have their place.
5 Steps to a Healthier Heart
Watching your weight is a good place to start for a healthier heart, but there's plenty more you can do.
3 Heart Numbers That Can Change Your Life
Your blood pressure, cholesterol, and waist size can forecast your risk for heart disease. Here's how to get those numbers where you want them.
Even a Little Weight Gain – or Loss -- Can Affect Your Heartburn
Even a few extra pounds increases your risk of heartburn. Losing weight can bring fast relief.
Health Check 5 -- Assess Your Risks for 5 Health Problems
WebMD Food-O-Meter: Calorie Counter & Calculator for Over 37,000 Foods and Drinks
Better Health Evaluator from WebMD
Parent’s BMI Calculator: Calculate Your Child’s BMI