BMI Percentile Calculator for Child and Teen

This calculator provides body mass index (BMI) and the corresponding BMI-for-age percentile based on CDC growth charts for children and teens ages 2 through 19 years. Because of possible rounding errors in age, weight, and height, the results from this calculator may differ slightly from BMI-for-age percentiles calculated by other programs.

For people 20 years old and older, use the Adult BMI Calculator.

Measuring Height and Weight Accurately At Home

BMI Calculator for Child and Teen

❗ Please check the accuracy of the information you entered.

Birth Date must be at least 2 years before Date of Measurement. If the child is under 2 years old, BMI cannot be calculated. Consult a healthcare provider for assessment.

Based on the Birth Date and Date of Measurement, the calculated age is 20 years or older. This calculator can be used only if the calculated age is less than 20 years old. If the dates you entered are correct, use the Adult BMI Calculator.


Age: Select Age


or enter only the total number of months:

Birth Date: Select Date


Date of Measurement: Select Date


Sex: Select Sex


Height (decimal places allowed): Select Height

Height, to nearest 1/8 inch: Select Height


(12 inches = 1 foot; Example: 4 feet, 5 1/2 inches)


Weight (decimal places allowed): Select Weight


Weight, to nearest 1/4 (.25) pound: Select Weight


(8 ounces = 1/2 pounds; Example: 75 3/4 pounds)

Height (decimal places allowed): Select Height

Weight (decimal places allowed): Select Weight

Child and Teen Healthy Weight and Obesity. Learn More at

Note: Please keep in mind that this BMI calculator is not meant to serve as a source of clinical guidance and is not intended to be a substitute for professional medical advice. Because BMI is based on weight and height, it is only an indicator of body fatness. Individuals with the same BMI may have different amounts of body fat. Persons may consider seeking advice from their healthcare providers on healthy weight status.

CDC Child and Teen BMI Calculator Widget

Add this widget to your website to let your audience calculate BMI for children and teens and see the corresponding BMI-for-age percentile on a CDC BMI-for-age growth chart. This calculator is for people 2 through 19 years old. BMI provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.