Height Percentile

The Clinical CDC Height Percentile & Growth App

Height Percentile Calculator

An accurate height percentile calculator using CDC 2000 stature-for-age LMS parameters. Check where height stands today, evaluate growth velocity, and review the science behind the percentile.

FREE QUICK CHECK / CDC 2000

Quick Height Percentile Calculator

Enter birth date, sex, and height to compute an instant CDC stature percentile.
CDC sex reference

This quick calculation runs in your browser and is not saved.

CDC 2000 reference standardsEducational information, not a diagnosisCore report is free

How This Height Percentile Calculator Works

Three distinct signals from one height percentile calculator

A height percentile calculator is not one tool — it answers different questions depending on what you need. This assessment compares a standing height with the CDC 2000 stature-for-age reference, adds a mid-parental target range, and, when a prior measurement is available, shows measured growth velocity. Each result is independent and each has a documented limit.

Where is this height today?

Current CDC stature percentile

This compares the entered standing height with the CDC 2000 stature-for-age distribution for the same completed age in months and selected sex reference. It is useful for describing a current reference position and for locating the corresponding age-specific chart.

Inputs needed
Complete birth date, assessment date, sex reference, and current standing height.
Read with this limit
A percentile does not show how fast someone is growing, identify a cause, or forecast adult height.
What range follows the family-height formula?

Family target height range

The full report applies the documented mid-parental-height formula to the two parent heights and shows a broad range around its midpoint. This is family context, not a personal destination, and it should be read alongside measurement history and other relevant context.

Inputs needed
Current height plus both parent heights in the same unit system.
Read with this limit
The range is formula-based. It does not account for every biological, developmental, or health factor.
How much did the measured height change?

Date-based measured growth velocity

When a dated earlier measurement is available, the full report annualizes the difference between the two entered heights. The date interval stays visible because a short, inconsistent, or inaccurate measurement interval can make the annualized number misleading.

Inputs needed
A current measurement and one earlier height with its actual measurement date.
Read with this limit
This describes the entered interval. It is not a future growth rate or an adult-height projection.
Start the free full assessmentReview formulas and limits

Deterministic sample report

See exactly how dated inputs become separate outputs.

This example is generated by the same current TallMax model used by the assessment. The fixed dates and measurements make the calculation reproducible: a 160 cm current height is compared with the male CDC reference at 180 completed months, the parent heights create a family formula range, and the earlier dated measurement creates a descriptive annualized change.

Illustrative synthetic test input only. It does not describe a real person, provide a diagnosis, or predict adult height. Similar-looking inputs can still need different interpretation.

Illustrative output / not a prediction

Synthetic model run

mph-cdc-v1

Fixed input

Assessment date
2026-09-05
Birth date
2011-09-05
Reference
Male CDC stature-for-age
Current height
160 cm
Father / mother heights
178 cm / 165 cm
Previous measurement
156 cm on 2026-03-05

Model output

CDC stature percentile
10.5th percentile
Current reference position
Family target range
169.5–186.5 cm
Midpoint: 178 cm
Measured annualized change
7.9 cm/year
Based on 184 elapsed days

Prepare reliable inputs

Record the measurement before interpreting the number.

Height differences can be small enough that footwear, posture, hair, floor level, wall trim, time of day, or a rounded date changes the apparent result. For a one-time percentile, use a careful standing-height measurement. For change over time, repeat the same method and preserve the actual date instead of estimating it later.

Follow the complete measurement guide
  1. 1

    Use a hard, level floor and a flat vertical surface. Remove shoes and bulky hair items.

  2. 2

    Stand upright with feet flat and look straight ahead. Use a rigid, level headpiece rather than guessing from a mark.

  3. 3

    Measure carefully, repeat if the readings disagree, and record the value in centimeters or inches without unnecessary rounding.

  4. 4

    Save the real measurement date. A growth-velocity calculation needs both the height difference and the elapsed time.

Open the chart for the teen’s exact age and sex reference.

The calculator uses age in months. These age pages provide a readable starting point for ages 13 through 17, with separate CDC reference views for boys and girls. Use the calculator when the exact birth date is available rather than treating every person of the same whole-year age as identical.

Browse all height percentile references

Mathematical Foundation

The CDC LMS formula powering the height percentile calculator

Behind every result from this height percentile calculator lies the CDC 2000 LMS methodology. For any given sex and age in months, the algorithm accesses three smoothed parameters: L (Box-Cox power skewness), M (median stature in cm), and S (generalized coefficient of variation). The system computes the exact Z-score using Z = ((Height/M)^L - 1) / (L * S). This Z-score is then mapped via the standard normal distribution function into your final height percentile.

Traditional charts require manual interpolation, whereas an online tool computes precise decimal values instantly. Still, any digital assessment is a mathematical instrument, not clinical advice. Significant percentile shifts warrant consultation with a pediatrician.

See formulas and limitationsOpen the CDC source data
Exact dates matter
A complete birth date selects age in months, while a real prior measurement date defines the growth interval.
Inputs stay reviewable
The report shows the measurements and dates behind the outputs so you can spot an entry or measurement problem.
Browser-local by default
Quick and full calculations run in the browser. Progress is retained only when you choose the local 24-hour save option.

Educational Guides

Deepen your knowledge of height percentiles and growth patterns

Using an online calculator is just the first step. Explore our evidence-based guides on accurate physical measurement, interpreting growth curves, understanding puberty timing, and recognizing when clinical attention is needed.

How to measure height accuratelySet up a repeatable standing-height measurement and record the date.Understanding height percentilesLearn what a percentile compares and why it is not a growth forecast.Puberty and growth-spurt timingUnderstand why puberty timing can change how same-age comparisons look.When to talk with a clinicianReview non-diagnostic prompts for discussing a growth concern with a professional.

The TallMax standard

A useful report keeps its boundaries visible.

No exact adult-height prediction, diagnosis, or guaranteed interpretation from a single number.
No account, payment, or upload is required for the core report.
Ages 13–17 only, with inputs, dates, method notes, and limits shown beside the results.
About TallMax and its editorial standard

Common Questions

Height percentile calculator questions and evidence-based answers

These answers describe the current TallMax quick check and free full assessment.

Does a height percentile calculator predict adult height?
No single calculation can definitively forecast adult stature. A height percentile calculator reveals where a person measures today relative to CDC benchmarks. Adult height depends on genetics, bone age maturation, nutritional factors, and puberty timing. Our full assessment adds parental target heights to give helpful statistical context.
Is this height percentile calculator private and secure?
Yes. This height percentile calculator processes all dates, heights, and formula computations entirely inside your browser using client-side JavaScript. The application never uploads or sells private health metrics.
Which age ranges does the height percentile calculator support?
The quick check tool in this height percentile calculator is calibrated for adolescents aged 13 through 17, using exact CDC stature-for-age monthly LMS tables. Our reference documentation and benchmark charts also discuss broader child and adult height percentile concepts.
What does the 50th height percentile mean?
The 50th percentile is the median: half of the reference population of the same sex and age is shorter and half is taller. A height percentile calculator positions you on that curve. The 50th percentile is not a health target — it simply marks the midpoint of the CDC reference distribution.
What is considered a normal height percentile?
Pediatricians generally treat any height percentile between the 3rd and 97th percentile as within the normal range. A height percentile calculator is useful for tracking position over time; a sustained drop across major percentiles is more meaningful than any single result.

When one percentile is not enough

Add family heights and a dated measurement to the free report.

Review every input before calculation. No account, payment, or upload is required for the core assessment.

Start the free full assessment