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A height, weight and age calculator is a tool used to calculate the body mass index, or BMI, of an individual. BMI is a measure of body fat based on the height and weight of adults over 20 and is used as an indicator of health, explains Medical News Today.


The most common way to determine the normal weight for age and height is by calculating body mass index, states the Centers for Disease Control and Prevention. There are a number BMI calculators available online, including one on the Medical News Today website.


Online calculators that determine body mass index, or BMI, are available on reputable websites that include the Centers For Disease Control and Prevention and the National Heart, Lung, and Blood Institute. BMI calculations express a relationship between a person's height and weight.


The National Institutes of Health's height and weight chart does not include weight by age; it only includes average weight by height. Height and weight charts for babies, children and teenagers are different then those for adults, and they also vary by sex.


The optimal weight for height can be calculated using the body mass index or BMI, claims the Centers for Disease Control and Prevention. The BMI is calculated by the formula of weight in kilograms divided by the height in meters squared.


Ideal weight is determined by several different formulas that take height, weight, body measurements and age into consideration to determine the body mass index or BMI. BMI indicates the amount of fat compared to muscle in the body.


The Centers for Disease Control and Prevention, World Health Organization, KidsHealth.org and MyGrowthCharts.com all have growth charts covering the clinically measured criteria for age ranges from newborn to 20 years old. The CDC and the National Institutes of Health have Body Mass Index charts for


The U.S. Centers for Disease Control and Prevention offers growth charts for children up to age 19 on its official website. The CDC offers two growth charts, including a World Health Organization chart for children up to age 2 and a CDC-created chart for children ages 2 and up.


A healthy weight can be determined by using the body mass index and by measuring the circumference of the waist. BMI is intended for people over age 20, according to WebMD.


When children start school at age 5, many are about 43 inches tall and weigh about 43 pounds, according to Drugs.com. During puberty, a child's height and weight increase rapidly. Children who have started puberty reach about 59 inches tall and weigh about 90 pounds by age 12, on average.