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BMI Percentile Calculator for Child and Teen
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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.
❗ 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, you cannot calculate BMI. Consult a healthcare provider for assessment.
Based on the Birth Date and Date of Measurement, the calculated age is 20 years or older. Only use this calculator if the person is younger than 20 years. If the dates you entered are correct, use the Adult BMI Calculator.
or enter only the total number of months:
Height (decimal places allowed): Select Height
Weight (decimal places allowed): Select Weight
Note: This BMI calculator is not a source of clinical guidance. It is not 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.
Add this widget to your website to let your audience calculate BMI for children and teens. It will also show 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 is a reliable indicator of body fatness for most people. It is used to screen for weight categories that may lead to health problems.
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For a full list of topics: A-Z Index
Body mass index (BMI) is a person’s weight in kilograms divided by the square of height in meters. It is an inexpensive and easy-to-perform method of screening for weight categories that may lead to health problems.
For children and teens, BMI is age- and sex-specific and is often referred to as BMI-for-age. In children, a high amount of body fat can lead to weight-related diseases and other health issues. Being underweight can also put one at risk for health issues.
A high BMI can indicate high body fatness. BMI does not measure body fat directly, but BMI is correlated with more direct measures of body fat1,2,3.
Calculating BMI using the BMI Percentile Calculator involves the following steps:
After BMI is calculated for children and teens, it is expressed as a percentile obtained from either a graph or a percentile calculator linked below. These percentiles express a child’s BMI relative to US children who participated in national surveys from 1963-65 to 1988-944. Weight and height change during growth and development, as does their relation to body fatness. Consequently, a child’s BMI must be interpreted relative to other children of the same sex and age.
The BMI-for-age percentile growth charts are the most commonly used indicator to measure the size and growth patterns of children and teens in the United States. BMI-for-age weight status categories and the corresponding percentiles were based on expert committee recommendations and are shown in the following table.
5th percentile to less than the 85th percentile
85th to less than the 95th percentile
Equal to or greater than the 95th percentile
The following is an example of how sample BMI numbers would be interpreted for a 10-year-old boy.
The CDC BMI-for-age growth charts are available at: CDC Growth Charts: United States.

For children and teens, BMI is not a diagnostic tool. Instead it is used to screen for potential weight and health-related issues. If children have a high BMI for their age and sex, a health care provider may perform further assessments to determine if excess fat is a problem. These assessments might include skinfold thickness measurements, evaluations of diet, physical activity, family history, and other appropriate health screenings. The American Academy of Pediatrics recommends using BMI to screen for overweight and obesity in children beginning at 2 years old. For children under the age of 2 years old, consult the World Health Organization (WHO) standardsexternal icon.

BMI is interpreted differently for children and teens even though it is calculated with the same formula. Due to changes in weight and height with age, as well as their relation to body fatness, BMI levels among children and teens are expressed relative to other children of the same sex and age. These percentiles are calculated from the CDC growth charts, which were based on national survey data collected from 1963-65 to 1988-944.
Obesity is defined as a BMI at or above the 95th percentile for children and teens of the same age and sex. For example, a 10-year-old boy of average height (56 inches) who weighs 102 pounds would have a BMI of 22.9 kg/m2. This would place the boy in the 95th percentile for BMI, and he would be considered to have obesity. This means that the child’s BMI is greater than the BMI of 95% of 10-year-old boys in the reference population.
For adults, BMI is interpreted as weight status categories that are not dependent on sex or age. Read more: How to interpret BMI for adult BMI

Normal or healthy weight weight status is based on BMI between the 5th and 85th percentile on the CDC growth chart. It is difficult to provide healthy weight ranges for children and teens because the interpretation of BMI depends on weight, height, age, and sex.

The prevalence of children and teens who measure in the 95th percentile or greater on the CDC growth charts has greatly increased over the past 40 years. Recently, however, this trend has leveled off and has even declined in certain age groups.
To learn more about child and teen obesity trends, visit Childhood Obesity Facts.

CDC and the American Academy of Pediatrics (AAP) recommend the use of BMI to screen for overweight and obesity in children and teens age 2 through 19 years. For children under the age of 2 years old, consult the WHO standardsexternal icon. Although BMI is used to screen for overweight and obesity in children and teens, BMI is not a diagnostic tool. To determine whether the child has excess fat, further assessment by a trained health professional would be needed.
For information about the consequences of childhood obesity, its contributing factors and more, see Tips for Parents – Ideas and Tips to Help Prevent Childhood Obesity.

In general, this is not possible. The adult calculator provides only the BMI value and not the BMI percentile. Consequently, it is not appropriate to use the BMI categories for adults to interpret the BMI of children and teens.
However, if a child or teen has a BMI of 30 kg/m2 or higher, the child almost certainly has obesity. A BMI of 30 kg/m2 is approximately the 95th percentile among 17-year-old girls and 18-year-old boys.

The interpretation of BMI varies by age and sex. So if the children are not the same age and the same sex, the interpretation of BMI has different meanings. For children of different age and sex, the same BMI could represent different BMI percentiles and possibly different weight status categories.
See the following graphic for an example for a 10-year-old boy and a 15-year-old boy who both have a BMI-for-age of 23. (Note that two children of different ages are plotted on the same growth chart to illustrate a point. Normally the measurement for only one child is plotted on a growth chart.)
Obesity during childhood can harm the body in a variety of ways, now and in the future. Learn more about the health consequences of obesity for children.
1Garrow, J.S. & Webster, J., 1985. Quetelet’s index (W/H2) as a measure of fatness. Int. J. Obes., 9(2), pp.147–153.
2Freedman, D.S., Horlick, M. & Berenson, G.S., 2013. A comparison of the Slaughter skinfold-thickness equations and BMI in predicting body fatness and cardiovascular disease risk factor levels in children. Am. J. Clin. Nutr., 98(6), pp.1417–24.
3Wohlfahrt-Veje, C. et al., 2014. Body fat throughout childhood in 2647 healthy Danish children: agreement of BMI, waist circumference, skinfolds with dual X-ray absorptiometry. Eur. J. Clin. Nutr., 68(6), pp.664–70.
4Kuczmarski, R.J. et al., 2002. 2000 CDC Growth Charts for the United States: methods and development. Vital Health Stat. 11., 11(246), pp.1–190.
5Ogden CL, Flegal KM, Carroll MD, Johnson CL. Prevalence and trends in overweight among US children and adolescents, 1999-2000. JAMA. 2002;288:1728–32.
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You will be subject to the destination website's privacy policy when you follow the link.
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