This allows you to check your childs weight against the overall population. According to the CDC these categories were chosen by an ‘expert committee’.
|Under 5th percentile.||Underweight|
|5th to less than 85th percentile.||Healthy Weight|
|85th to less than 95th percentile.||Overweight|
|95th percentile and above.||Obese|
A percentile is a way of dividing a population into 100 equal groups. For example; if you are above the 95th percentile, you would be in the top 5%.
The US CDC provides a large amount of growth charts that break down childhood weight and height data into a series of percentiles (source).
As children are still growing, a simple measurement of weight for height (as is BMI) is not appropriate. Children’s growth happens at all different ages and stages, so instead of straight BMI, for children it is often referred to as BMI-for-age.
These calculators do not measure body composition (this is usually done using skinfold thickness), and BMI is not a diagnostic tool. If you have any concerns please consult your local physician.
See also the CDC BMI Calculator.
Due to data available from the CDC, results can only be broken down into 3rd, 5th, 10th, 25th, 50th, 75th, 85th, 90th, 95th, and 97th percentile groupings.