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How to Calculate health status (overweight, healthy weight or obese) for Boys and Girls below age 18 years.
For Adults visit this page
The calculation of health status in boys and girls below 18 years of age is not as straight forward as done in Adults because weight and height changes immensely during growth and development stage and their relation to body fatness.

So to calculate the health status (in terms of underweight, overweight, healthy weight or obese) of children below 18 years of age, parameters like height, weight, age and sex specifications are required.
While in Adults men and women, health status can be easily calculated using height and weight parameters.

Steps to calculate the health status in boys and girls below age 18 years

1. First Calculate children BMI - Visit this link
    OR
   The following equation can be used to determine BMI
   BMI = Weight (kg) / height (m) Height (m) [guidelines for measuring at home]
2. After BMI is calculated for children and teens, it is expressed as a percentile which can be obtained from a graph as specified at below two separate links for boys and girls.

3. Once you get your respective chart then compare it with weight status category table and percentile (like average) range table as shown below table.
For Boys 2 to 18 years - weight, Height and BMI
download this pdf file
For Girls 2 to 18 years - weight, Height and BMI
download this pdf file
A short introduction about BMI (Body mass Index)
A high BMI can be an indicator of high body fatness. BMI does not measure body fat directly, but research has shown that BMI is correlated with more direct measures of body fat. BMI can be considered an alternative to direct measures of body fat.
In general, BMI is an inexpensive and easy-to-perform method of screening for weight categories that may lead to health problems.
Weight status category table
The BMI-for-age percentile growth charts are the most commonly used indicator to measure the size and growth patterns of children and teens. BMI-for-age weight status categories and the corresponding percentiles were based on expert committee recommendations and are shown in the following table.
Weight Status Category
Percentile Range
Underweight
Less than the 5th percentile
Normal or Healthy Weight
5th percentile to less than the 85th percentile
Overweight
85th to less than the 95th percentile
Obese
Equal to or greater than the 95th percentile
Please note - Because weight and height changes during growth and development, as does their relation to body fatness, a child’s BMI must be interpreted relative to other children of the same sex and age.
BMI ((measured using height, weight, age and sex parameters in children below 18 years of age) is used to calculate Health status that is whether the body is overweight, healthy weight, obese or underweight.
For children below the 2 years old refer WHO (World Health Organisation) standards
How is BMI used with children and teens?

For children and teens, BMI is not a diagnostic tool and is used to screen for potential weight and health-related issues.

For example, a child may have a high BMI for their age and sex, but to determine if excess fat is a problem, a health care provider would need to perform further assessments.

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 the use of 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 WHO standards
Is BMI interpreted the same way for children as it is for adults?
Obesity for boys and girls under age 18 years of same age and sex is defined as a BMI at or above the 95th percentile.

For example - A 10-year-old boy of average height (56 inches) who weighs 102 pounds would have a BMI of 22.9. 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.
Can I determine if my child or teen is obese by using an adult BMI calculator?

In general, it’s not possible to do this.

The adult calculator provides only the BMI value (weight/height2) and not the BMI percentile that is needed to interpret BMI among children and teens. 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, the child is almost certainly obese. A BMI of 30 kg/m2 is approximately the 95th percentile among 17-year-old girls and 18-year-old boys.

The following is an example of how sample BMI numbers would be interpreted for a 10-year-old boy.
Source - CDC, Centers for Disease Control and Prevention.USA.
If two children have the same BMI values, but one is considered obese and the other is not. What is the reason?

The interpretation of BMI varies by age and sex in children below 18 years of age. 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.)
Source - CDC, Centers for Disease Control and Prevention.USA.
Terms of Use
The material on this web site is provided for educational purposes only, and is not to be used for medical advice, diagnosis or treatment.
Please visit below pages for more respective information
If you are looking for information like health benefits, diseases related to your health due to excess weight,
precautions need to be taken, healthy activities to stay fit, calories consumption and more then visit below
respective pages

Are you underweight?
Are you health weight?
Are you overweight?
Are you Obese?
BMI is interpreted differently for children and teens even though it is calculated as weight ÷ height2. Because there are changes in weight and height with age, as well as their relation to body fatness, BMI levels among children and teens need to be expressed relative to other children of the same sex and age as explained above in charts.