Teen BMI Calculator - Determine
Easy Teenage BMI calculator for age and growth percentile

A teen BMI calculator really consists of both a BMI calculator and the use of established BMI-for-age growth charts to determine age- and gender-specific BMI for teens and children.

The body mass index (BMI) is an established and reliable measure of relative body fatness. However, it is important to understand how to use teenage BMI calculator correctly for teenagers and children.

BMI for teens and children is only useful when it is plotted on the appropriate BMI-for-age growth chart.

teen BMI calculator

Introduction to BMI for Teens and Children
To calculate BMI for teens and children, you first calculate the BMI value based on your child’s height and weight using a BMI calculator. You then plot this BMI number on an age- and gender-specific BMI-for-age growth chart. This plotted BMI value results in a percentile ranking which is the most commonly used indicator to assess the size and growth patterns of individual children in the United States.

Use of the established BMI-for-age growth charts is standard practice by the American Academy of Pediatrics. This is now required as part of the well-child exam for children ages 2 through 19 by the Child Health and Disability Prevention (CHDP) Program. While BMI for children and teens has become standard as an effective screening tool, it is not a diagnostic tool for overweight and obesity.


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Using the Teen BMI Calculator and Growth Charts
Again, calculating your child's age-specific BMI is a multi-step process. Follow these steps to determine a BMI value and corresponding BMI-for-age percentile to better assess your child's weight status.

Step 1: Use Teen BMI Calculator to Determine BMI Value
The first step is to use the following BMI calculator to determine the BMI value based on accurate height and weight. Simply enter your child's height and weight into the appropriate entry boxes to get his or her "Body Mass Index" value.

Teen BMI Calculator



Step 2: Determine BMI-for-age Percentile Ranking
Plot the value from the teen BMI calculator on one of the BMI-for-age charts below. Be sure to use the correct gender-specific chart, either for a boy or for a girl. To plot the BMI value on the chart, find the BMI value on the left or right side of the chart and follow across to the point where your child's age intersects from the bottom. This is your child's BMI-for-age percentile ranking.

Note that these charts are for boys and girls from age 2 to 20. There are also gender-specific growth charts for birth to 36 months of age, which provide information relevant to infants and toddlers such as length-for-age, weight-for-age, weight-for-length, and head circumference-for-age. Your pediatrician can provide details regarding the birth-to-36 months measurements.

Boys: 2 to 20 Years (Click image to print)

teen-bmi-calculator-boys

Girls: 2 to 20 Years (Click on image to print)

teen-bmi-calculator-girls


Step 3: Determine Weight Status Category
The BMI-for-age plot indicates the corresponding percentile range your child is in. The percentile ranges and corresponding BMI-for-age weight status categories are shown in the following table.

BMI-for-age Percentile Ranges

Weight Status Category Percentile Range
Underweight Less than the 5th percentile
Healthy weight 5th percentile to less than the 85th percentile
Overweight 85th to less than the 95th percentile

Obese Equal to or greater than the 95th percentile

For teens and children, this is the BMI indicator of your child’s weight status relative to established growth rates and patterns for children of the same age and gender. Your child’s percentile ranking may change significantly from one year to another due to variations in his or her growth rate for the year.


Summary
It is important to recognize that these percentile ranges and weight status categories are used to assess your child’s growth over time. This percentile ranking shown in this teenage BMI calculator indicates whether your child is overweight, underweight, at risk of becoming overweight, or experiencing unusually slow or rapid growth rates. Again, this is all relative to other children of the same age and gender.

Using a teen BMI calculator and growth charts like this can be very informative. However, if you have any questions or concerns regarding your child’s weight-related health, it is important that you consult with your pediatrician.

Teen BMI Calculator




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