A specific comparison group
The calculator selects the CDC curve for the chosen sex and completed month of age.
CDC stature-for-age
Enter one measured height
CDC reference chart
Use a recent standing-height measurement taken without shoes.
Estimated position
the 60th percentile140.0 cm at 10 years on the CDC girls reference.
The measured height equals or exceeds about 60% of children of the same age and sex in the CDC reference population.
3rd126.0 cm25th133.7 cm50th138.2 cm75th142.8 cm97th151.3 cm
One percentile is not a diagnosis. Repeated accurate measurements and the overall growth pattern matter more than a single point.
Ages 2–20 · CDC reference
Height Percentile Calculator
Enter age, sex, and measured standing height to estimate where a child's stature falls on the CDC 2000 growth-chart reference. The result is a comparison point, not a diagnosis or adult-height prediction.
Read the result
What does a height percentile mean?
A height percentile ranks one standing-height measurement against a reference group of children with the same age and sex. The 50th percentile is the median: half of the reference group is shorter and half is taller.
Higher is not automatically better
A percentile describes position, not health, potential, or an ideal height.
One point is only one point
Repeated accurate measurements are more useful for seeing a growth pattern.
Choose the matching reference
Height percentiles for girls and boys
A height percentile calculator for girls and boys must use separate published CDC reference curves. The sex selection changes the comparison group; it does not change the measured height or turn the percentile into a health score.
Compare with girls of the same age
The girls' curve uses the CDC distribution for females at the selected completed month. This matters because typical growth timing and the reference distribution change with age.
Compare with boys of the same age
The boys' curve uses the corresponding CDC male reference. The same measured height can therefore produce a different percentile when a different published curve is selected.
Use the curve as context, not a target
Neither curve defines an ideal percentile. Accurate measurements, family growth patterns, puberty timing, and change over time all provide context that one result cannot capture.
Age changes the comparison
Child height percentiles by age
A child's height is compared with children at the same completed month, not with one fixed chart for every age. Entering the correct years and months is especially important around age 2 and during the faster growth of puberty.
Switch from lying length to standing height
This tool begins at age 2 and expects stature measured while standing. For a younger toddler or infant measured lying down, use the WHO infant calculator instead of mixing the two methods.
Follow comparable measurements
Use the same equipment and technique when possible. A series of reliable measurements is more informative than comparing results taken with shoes, uneven posture, or rounded ages.
Puberty can change the short-term pattern
Growth spurts occur at different times, so a teen's percentile may shift before settling. This calculator describes current stature and does not predict remaining growth or adult height.
Use repeated measurements
How to follow a child's height percentile over time
A percentile becomes more useful when each point comes from a comparable measurement. Record the date, completed age, measured height, and method so a later result can be interpreted as part of a pattern rather than as an isolated number.
Repeat the measurement carefully
Use standing height, remove shoes, and measure against a level surface each time. Recheck an unexpected value before treating a sudden percentile change as a change in growth.
Focus on direction, not a target percentile
Children do not need to stay exactly on one percentile. The useful question is whether reliable measurements form a plausible pattern for that child's age and stage of development.
Discuss persistent concerns with a professional
A clinician can review growth velocity, family history, nutrition, puberty timing, and other health information. This page cannot determine the cause of a low, high, or shifting result.
Calculation method
How is height percentile calculated?
The calculator uses the CDC's published stature-for-age L, M, and S parameters for each sex and completed month from age 2 through 20. It converts height to a z-score with the CDC LMS equation, then maps that score to the standard normal distribution.
The calculation runs in the browser. Names and birth dates are not requested, and this tool does not save the measurement or result.
Completed years and months identify the matching stature parameters.
z = ((height ÷ M)L − 1) ÷ (L × S)
The marker and reference heights use the same CDC parameter row.
Measurement quality
How to measure a child's standing height
Small measurement errors can move the calculated percentile. Use standing height only for this age-2-to-20 calculator.
- 1
Remove shoes
Measure on a hard, level floor against a flat vertical surface.
- 2
Stand straight
Keep feet flat and look straight ahead with the head level.
- 3
Lower a flat headpiece
Make firm contact with the crown and read at eye level.
- 4
Record before rounding
Use the same method when repeating the measurement later.
Primary sources
CDC growth-chart data and limits
The calculator uses the CDC 2000 stature-for-age LMS data published by the National Center for Health Statistics. CDC explains that a percentile indicates what share of the reference population a measurement equals or exceeds.
CDC recommends WHO growth standards from birth to age 2 and CDC growth charts from age 2 through 20 in U.S. clinical settings. If a child's growth is a concern, discuss the pattern with a clinician.
Height percentile FAQ
Common questions about the result
What is a height percentile?
A height percentile describes a child’s position in a reference population of children of the same age and sex. A result at the 60th percentile means the measured height equals or exceeds about 60% of that reference group.
Does a higher height percentile mean healthier growth?
No. A percentile is a position, not a health grade or target. Clinicians consider accurate measurements and the pattern over time rather than treating one high or low percentile as a diagnosis.
Why does this height percentile calculator start at age 2?
It uses the CDC stature-for-age reference for standing height from ages 2 through 20. For children younger than 2, use recumbent length with the WHO infant growth standards instead.
Can this calculator diagnose a growth problem?
No. It calculates a statistical position from one measurement. A health care provider can assess repeated measurements, measurement quality, family history, puberty timing, and other clinical information.