Child BMI percentile calculator and CDC growth curve

Enter standing height, weight, completed years, additional completed months, and the sex category used by the CDC reference. The calculator first divides weight in kilograms by height in meters squared. It then compares that BMI with children of the same reference age and sex. For example, 30 kg and 1.30 m give a BMI of about 17.8 kg/m². The percentile depends on age and the selected chart, so that BMI alone cannot tell you the percentile.

The blue point shows the entered BMI at the entered age. The four lines show the 5th, 50th, 85th, and 95th CDC BMI-for-age reference percentiles. The table below the curve gives those and other reference values at the entered age. The point is one calculation, not a growth history. If you compare results from different dates, use measurements taken with a consistent method and keep the chart version with each result.

An adult BMI category does not apply to a child. Age in completed months, height, weight, and the CDC sex category all affect this result. Body Numeral uses the midpoint of the completed month, as described by CDC. The 2022 extended method changes the upper tail above the 95th percentile; the 2000 method remains available for comparison. These are screening references, not a diagnosis or a body-fat measurement. A clinician can interpret growth over time with the rest of a child’s health information.