Commonly accepted BMI ranges are underweight (under 18.5 kg/m 2), normal weight (18.5 to 25), overweight (25 to 30), and obese (over 30).Ī graph of body mass index as a function of body mass and body height. That categorization is the subject of some debate about where on the BMI scale the dividing lines between categories should be placed. The BMI is a convenient rule of thumb used to broadly categorize a person as underweight, normal weight, overweight, or obese based on tissue mass (muscle, fat, and bone) and height. The BMI may be determined using a table or chart which displays BMI as a function of mass and height using contour lines or colours for different BMI categories, and which may use other units of measurement (converted to metric units for the calculation). The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m 2, resulting from mass in kilograms and height in metres. Entering this section of the web site implies acceptance of the conditions stated above.Body mass index ( BMI) is a value derived from the mass (weight) and height of a person. Unauthorized duplication or distribution is a violation of copyright. This software is protected under international copyright law. Additionally, the authors and their affiliated institutions are not liable for any damages to users or third parties arising from the use of this software. Thus, this software should not be used for medical diagnostic or treatment purposes. Individual results, when compared to other children, can be affected by many factors such as the parents' body sizes and the child's level of physical maturity. Department of Health and Human Services). The tools provided here are based on publicly available data from the National Health and Nutrition Examination Survey (Centers for Disease Control and Prevention, U.S. You can read more about BMI and daily energy requirements at the Children's Nutrition Research Center's web site. Centers for Disease Control and Prevention ( CDC) recommend the use of BMI to screen for overweight and obesity in children beginning at 2 years old.īMI-for-age weight status categories and their related percentile rangesĪre shown in the following table: BMI for Age - Weight Status Categoriesĥth percentile to less than the 85th percentileĮqual to or greater than the 95th percentile The American Academy of Pediatrics ( AAP) and the U.S. To help put a child's growth into perspective, use the charts below to further compare weight & height measurements with age- and gender-specific growth charts. Therefore, it's important that children with a BMI-percentile-for-age over the 85th percentile be evaluated by a health professional. As a result, a child may have a high BMI for their age and gender, but to determine if excess fat is a problem, a health care provider would need to perform further tests. Very athletic kids can have a high BMI-for-age due to extra muscle mass, not necessarily excess body fat. BMI and BMI-percentile-for-age do not directly measure body fat. Keep in mind that BMI is not a diagnostic tool. This BMI-calculator automatically adjusts for differences in height, age and gender, making it is one of the best tools for evaluating a growing child's weight. The amounts of body fat, muscle, and bone change with age, and differ between boys and girls. This calculator can help to determine whether a child is at a healthy weight for his/her height, age and gender. ![]() BMI is calculated from a person's weight and height. Body Mass Index (BMI) is used as a screening tool to identify possible weight problems in children.
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