Is the WebMD Kids BMI Calculator accurate for my child?

The calculator uses CDC BMI-for-age percentiles adjusted for sex and age, which is the standard method recommended by health professionals. However, it provides an estimate based on the numbers you enter, and a pediatrician should interpret the result in the context of your child’s overall health.

Can I use this calculator for a child under age 2?

No, the WebMD Kids BMI Calculator is designed for children and teens ages 2 through 20. For infants and toddlers under 2, pediatricians typically use weight-for-length growth charts instead.

Does the calculator require me to convert measurements to metric units?

No, the tool accepts height in feet and inches and weight in pounds, so you can enter the measurements you already have without needing to convert to centimeters or kilograms.

What do the BMI categories mean for my child?

The calculator places your child into one of four categories—underweight, healthy weight, overweight, or obese—based on CDC percentiles for their sex and age. These ranges help identify whether a child’s weight is typical for their age, but the result should be discussed with a doctor for personalized guidance.

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BMI Calculator for Teens

Provided byWebMDwebmd.com

WebMD’s Kids BMI Calculator helps parents check a child’s BMI category using sex, age, height, and weight inputs. It ...

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About this tool

What BMI Calculator for Teens does

The WebMD Kids BMI Calculator lets parents quickly determine their child’s BMI category by entering sex, age, height, and weight. The result places the child into one of four CDC-defined ranges: underweight, healthy weight, overweight, or obese, and includes a brief note that BMI is only one data point in assessing health. The interface uses simple dropdown menus for age and sex, and accepts height in feet and inches or weight in pounds, removing the need for manual conversions. A prominent note reminds users that BMI is just one health indicator, encouraging further conversation with a pediatrician. Compared with other free teen BMI tools, WebMD’s version stands out for its clean, parent-focused layout, clear category labels, and the inclusion of a medical disclaimer directly on the calculation page, which many competing calculators omit or bury elsewhere.

Step by step

How to use the WebMD BMI Calculator for Teens

1
Select the child’s sex from the Male or Female dropdown
2
Choose the child’s age using the age-specific list (2 through 20)
3
Enter height in feet and inches, or weight in pounds, in the respective fields
4
Click the Calculate button to see the BMI value and weight category
5
Read the brief explanation of what the result means for the child’s health

Is it right for you

Best for

Parents and caregivers who want a quick, free, and easy-to-use BMI check for their child or teen with clear category labels and a built-in reminder to consult a doctor.

Limitations

Relies on self-reported height and weight, which may be approximate
Provides category ranges only; does not give a detailed body composition analysis
Includes a medical disclaimer that results are not a diagnosis

Questions

BMI Calculator for Teens FAQ

Is the WebMD Kids BMI Calculator accurate for my child?: The calculator uses CDC BMI-for-age percentiles adjusted for sex and age, which is the standard method recommended by health professionals. However, it provides an estimate based on the numbers you enter, and a pediatrician should interpret the result in the context of your child’s overall health.
Can I use this calculator for a child under age 2?: No, the WebMD Kids BMI Calculator is designed for children and teens ages 2 through 20. For infants and toddlers under 2, pediatricians typically use weight-for-length growth charts instead.
Does the calculator require me to convert measurements to metric units?: No, the tool accepts height in feet and inches and weight in pounds, so you can enter the measurements you already have without needing to convert to centimeters or kilograms.
What do the BMI categories mean for my child?: The calculator places your child into one of four categories—underweight, healthy weight, overweight, or obese—based on CDC percentiles for their sex and age. These ranges help identify whether a child’s weight is typical for their age, but the result should be discussed with a doctor for personalized guidance.

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