Skip to main content
Child Growth Lab

Pediatric growth calculators based on CDC and WHO growth standards.

Pediatric Growth Calculators and Guides

Child Growth Lab helps parents, caregivers, professionals, and other adults choose pediatric growth calculators and interpretation guides built from CDC and WHO reference materials and clearly documented formulas and datasets. Start with the child's age, the measurements you have, and the question you want the tool to answer.

These tools provide educational reference calculations. They do not diagnose a condition, recommend treatment, or replace an appropriate healthcare professional.

Find the right calculator

Choose the right starting point

Choose by age first, then by the information already available. Change-over-time and family-height questions use separate tools because they answer a different kind of question.

Birth to before age 2

  • Baby Growth Percentile Calculator

    Have:
    A birth date, measurement date, sex chart, and current weight, recumbent length, or head circumference.
    Result:
    WHO weight-, length-, weight-for-length-, or head-circumference reference percentiles for the measurements entered.
    Not included:
    Corrected-age substitution, preterm chart selection, or a growth trend.

  • Corrected Age Calculator

    Have:
    A recorded preterm birth plus the original due date or gestational age at birth.
    Result:
    Chronological age, corrected-age timeline, born-early adjustment, and 40-week reference date.
    Not included:
    Automatic growth-chart selection, a changed birth date, legal age, or vaccine schedule.

Second birthday to before age 20

  • Child Growth Chart Calculator

    Have:
    One dated standing-height measurement, weight measurement, or both.
    Result:
    CDC height- and/or weight-for-age percentiles, plus BMI-for-age and its screening category when both measurements are entered.
    Not included:
    A diagnosis, treatment recommendation, or growth trend from one date.

  • Height Percentile Calculator

    Have:
    One dated standing-height measurement.
    Result:
    A focused CDC stature-for-age percentile.
    Not included:
    Weight status, BMI, adult-height prediction, or change over time.

  • Weight Percentile Calculator

    Have:
    One dated weight measurement.
    Result:
    A focused CDC weight-for-age percentile.
    Not included:
    Adjustment for height, a BMI category, or change over time.

  • Kids and Teen BMI Calculator

    Have:
    One dated standing-height and weight pair.
    Result:
    BMI, CDC BMI-for-age percentile, and CDC screening category.
    Not included:
    Diagnosis, direct body-fat measurement, or an overall health conclusion.

Questions that need a different starting point

  • Growth Velocity Calculator

    Have:
    Two height/length measurements or two weight measurements with dates.
    Result:
    The arithmetic change and annualized rate between the submitted dates.
    Not included:
    A velocity percentile, diagnostic threshold, or future prediction.

  • Mid-Parental Height Calculator

    Have:
    Both biological parents’ measured adult heights.
    Result:
    A rough central family-height estimate and approximate family-height range.
    Not included:
    An individualized adult-height prediction, bone age, or current growth assessment.

What kind of answer do you need?

Growth reference percentile
Baby Growth, Growth Chart, Height, Weight, and Kids BMI compare a current measurement with an age- and sex-specific reference distribution.
Change rate
Growth Velocity compares two dated measurements arithmetically. It is not a velocity percentile or diagnostic threshold.
Timeline context
Corrected Age describes the timing of a recorded preterm birth. It does not change a birth date, legal age, or vaccine date.
Family-height context
Mid-Parental Height provides a rough family-height background. It is not an individual adult-height prediction.
Browse interpretation guides

How Child Growth Lab works

Calculators use official CDC and WHO growth reference materials plus documented arithmetic formulas. Dataset provenance, formula versions, and limitations are published in Methodology. Inputs are processed in the browser and are not stored as child health records. No account is required. Parent-facing results come first, while technical values and formula details stay in a secondary layer. The editorial review and correction process is public. Every result remains educational reference information rather than diagnosis, medical advice, or treatment.

Choose a next step

Compare all eight calculatorsOpen Child Growth Chart Calculator