Can I use this calculator for a premature baby?

The calculator uses the 2006 WHO growth standard charts, which the CDC recommends for U.S. infants and children from birth to 2 years of age.

What do the percentile and z-score results mean?

Results are based on the WHO 2006 international growth standards, which describe growth patterns in children believed to have optimal living conditions, rather than population averages.

Does the tool support both metric and imperial units?

The tool is designed for infants from 0 to 24 months of age; measurements for older children would fall outside the referenced WHO standard chart range.

Pregnancy & PediatricsTool Review

Baby Percentile Calculator

Provided byPediToolspeditools.org

This free WHO growth calculator reports infant percentiles and z-scores for weight, length, and head circumference. I...

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About this tool

What Baby Percentile Calculator does

The PediTools Baby Percentile Calculator determines infant growth percentiles and z-scores for weight, length, and head circumference using the 2006 WHO growth standard charts. Designed for babies from 0 to 24 months, the tool accepts age in months or a specific date, with an optional gestational-age adjustment for premature infants. Results are presented as percentile ranks and z-scores, providing a clear indication of how a child's measurements compare to international reference data. The site also references CDC recommendations endorsing WHO standards for U.S. use in children up to age 2. The PediTools version distinguishes itself through its specialized focus on WHO standards and a clean, clinical interface designed for both parents and pediatric providers. Unlike broader calculators, it offers distinct tabs for weight, length, and head circumference, each with dedicated growth chart references (WHO 0-24m, CDC 2-20y, and others). The optional gestational-age adjustment and the ability to input data by date or age-in-months provide flexibility for diverse tracking needs. Additional resources, such as bilirubin calculators and multiple chart overlays, extend its utility beyond a simple percentile check.

Step by step

How to use the PediTools Baby Percentile Calculator

1
Select the measurement type: weight, length, or head circumference
2
Enter the baby's age in months or specific birth date, and optionally adjust for gestational age if premature
3
Input the baby's measurement value using the supported unit system
4
View the resulting percentile rank and z-score displayed alongside the relevant growth chart reference

Is it right for you

Best for

Parents and clinicians seeking a free, WHO-standard growth assessment for infants up to 24 months, particularly those needing gestational-age adjustments or comparing multiple measurement types in one interface.

Limitations

Primarily designed for babies 0 to 24 months; less suitable for older children
Requires accurate age input; gestational-age adjustment depends on correct prematurity data
Results are based on WHO standards and may differ from CDC growth chart percentiles

Questions

Baby Percentile Calculator FAQ

Can I use this calculator for a premature baby?: The calculator uses the 2006 WHO growth standard charts, which the CDC recommends for U.S. infants and children from birth to 2 years of age.
What do the percentile and z-score results mean?: Results are based on the WHO 2006 international growth standards, which describe growth patterns in children believed to have optimal living conditions, rather than population averages.
Does the tool support both metric and imperial units?: The tool is designed for infants from 0 to 24 months of age; measurements for older children would fall outside the referenced WHO standard chart range.

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