Children with a BMI between the 85th and 95th percentile are considered to be overweight.
A BMI that is less than the 5th percentile is considered underweight and above the 95th percentile is considered obese. This would place the boy in the 95th percentile for BMI - meaning that his BMI is greater than that of 95% of similarly aged boys in this reference population - and he would be considered to have obesity. 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. Obesity among 2- to 19-year-olds is defined as a BMI at or above the 95th percentile of children of the same age and sex in this 1963 to 1994 reference population. Children and teen BMI needs to be age and sex-specific because the amount of body fat changes with age and the amount of body fat differs between girls and boys. BMI is interpreted differently for children and teens, even though it is calculated using the same formula as adult BMI. This results in taller people having a reported BMI that is uncharacteristically high, compared to their actual body fat levels. So, if all body dimensions double, and mass scales naturally with the cube of the height, then BMI doubles instead of remaining the same. BMI is proportional to mass and inversely proportional to the square of the height. BMI is generally regarded as a satisfactory tool for measuring whether sedentary individuals are underweight, overweight or obese with various exceptions, such as: athletes, children, the elderly, and the infirm. BMI can be used for population assessment of overweight and obesity. If you are 70th percentile in weight that means your child is heavier than 70 out of 100 kids. For example, if you are 40th percentile in height, that means that you are taller than 40 out of 100 typical children of the same age and sex. Since height is commonly measured in centimeters, divide height in centimeters by 100 to obtain height in meters.Įxample: Weight = 68 kg, Height = 165 cm (1.65 m)įormula: weight (lb) / 2 x 703Ĭalculate BMI by dividing weight in pounds (lbs) by height in inches (in) squared and multiplying by a conversion factor of 703.Įxample: Weight = 150 lbs, Height = 5'5" (65")Ĭalculation: x 703 = 24.96Īccording to the United States CDC National Center for Health Statistics BMI, height, and weight percentiles show how your child compares to other children. With the metric system, the formula for BMI is weight in kilograms divided by height in meters squared. Measurement Units - Formula and Calculation The calculation is based on the following formulas: 
The BMI Calculation Formulaīody Mass Index is calculated the same way for both adults and children. It is important to have your doctor perform regular BMI measurements for your child so the doctor can discuss the results with you. In addition you may wish to try our Height to Weight Ratio Chart to measure an average adult's height/weight ratio. NOTE: For Adult male and female BMI measurements you will need to enter your information into our Body Mass Index Calculator for Adults.
You can also check your child's Height to Weight Ratio and Infant Growth Percentile Adult BMI Calculator The Child BMI calculator below determines if your child is at a healthy weight for their age (up to 20 years of age), simply enter the required information and calculate their BMI level. Doctors often use a BMI calculation to determine if a child's weight is appropriate for their height and age.
Simply put, BMI is a calculation that uses height and weight measurements to calculate how much body fat a person has. BMI can be used as a screening tool but is not diagnostic of the body fatness or health of an individual. A high BMI can be an indicator of high body fatness. When the term BMI is used informally, the units are usually omitted. If pounds and inches are used, a conversion factor of 703 (kg/m2)/(lb/in2) must be applied. The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m2, resulting from weight in kilograms and height in meters. The body mass index (BMI), or Quetelet index, is defined as a value derived from the mass (weight) and height of an individual. Life Expectancy Statistics Chart by States World Average Human Life Span Expectancy by Country.This article is from our digest of publications relating to Medical Calculators and Charts that also includes:
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