Height Percentile Calculator
Compare a child's height with population-based growth charts (ages 2–20, boys and girls).
How to Use This Calculator
Measure accurately
Measure standing height without shoes, heels against a wall, using a stadiometer or tape measure.
Enter age and sex
Growth charts differ for boys and girls. Record age in decimal years to capture months (e.g., 8.5 = 8 years 6 months).
Review percentile and trend
A single percentile is less important than the growth trajectory across several visits.
Formula
1. Interpolate 5th, 50th, and 95th percentile heights for the selected age.
Data approximate the CDC 2000 growth charts. Interpolation captures intermediate ages between annual data points.
About Height Percentiles
Height percentiles compare a child's stature to peers of the same age and sex. Most healthy children track along a consistent percentile channel. Deviations can signal constitutional delay, endocrine issues, or chronic illness.
Pediatricians assess growth velocity (centimeters per year), parental heights (mid-parental target), and puberty timing when evaluating stature concerns.
When to investigate further
Tall stature above the 97th percentile may be normal familial variation or related to endocrine conditions such as hyperthyroidism or growth hormone excess.
- Height percentile falling across two major percentile lines.
- Growth velocity below expected norms for age and puberty stage.
- Height far below target height range based on parents.
Frequently Asked Questions
How often should height be measured?
Ideally every 6–12 months in childhood. More frequent measurements help detect changes in growth velocity.
Does genetics affect percentile?
Yes. Tall parents often have tall children. Doctors use mid-parental height to estimate expected growth range.
What if my child is short but healthy?
Many children with familial short stature or constitutional growth delay are healthy and achieve adult heights consistent with family patterns.
Do growth spurts change percentiles?
During puberty, growth spurts can temporarily raise or lower percentiles. Long-term trends are more informative.
Can nutrition improve height percentile?
Adequate nutrition, sleep, and health maintenance support optimal growth, but genetics largely determine final height.