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BMI Percentiles for Teens

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Teen boy being weighedAs you grow, your body keeps changing. That's why every time you go for a checkup the nurse checks your weight and your height. She's measuring to see how much you've grown and may be using those numbers to figure out your body mass index or BMI.

BMI is one way to measure how much body fat you have. Doctors check BMI because weighing too much for your height can lead to health problems like heart disease, diabetes, and high blood pressure.

To find out your BMI, you need to know your age, gender, height, and weight. With this information, a doctor can look at a pediatric growth chart to determine your BMI. You can also use an online teen BMI calculator

Teens need to use a pediatric BMI calculator, not the ones adults use, to get correct results. For adults, BMIs are numbers. For kids and teens, BMIs are percentiles.

Comparing Yourself to Other Teens

Teen BMI percentiles show how your weight compares to teens who are the same age and gender as you. For example, a teenage girl with a 75th percentile BMI is heavier than 75 out of 100 other girls her age. A healthy range is between the 5th and 85th percentiles.

Here's how teen BMI percentiles break down:

  • Underweight: 0 to the 4th percentile
  • Healthy Weight: 5th percentile to 85th percentile
  • Overweight: 86th percentile to 95th percentile
  • Obese: 96th percentile to 99th percentile

A high BMI can mean you weigh more than expected for your height. A low BMI can mean you weigh less than expected for your height. BMI percentiles are generally considered fairly accurate, especially with heavier teens. In some cases BMI percentiles can be misleading, though. Athletic teens, for example, may fall into the overweight category when actually they are muscular.

After your BMI is calculated, your doctor may follow up by asking questions about what you eat and how much you exercise. Knowing more will help your doctor figure out the next best step if you fall within an underweight, overweight, or obese BMI percentile.