On-site Resources
Consolidated 2022 AAP and Premie BiliRecs
Single tool for hyperbilirubinemia clinical decision support for newborns 27 - 40+ weeks gestation. Guidance from 2022 AAP Guidelines and Stanford Premie BiliRecs.
Gestational age calculator for newborn infants
Enter any available dates, ages, or gestations, and other values will be calculated.
PediTools Patient Growth Charts
Generates longitudinal growth charts for any growth calculator on this site.
PediTools Bulk Analysis
Analyze up to 10,000 rows at a time for any growth calculator on this site.
All Growth Calculators
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Search the complete catalog of PediTools growth calculators (sources and methods)
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Preterm | |
Fenton 2025 growthPreterm infants, 22½ to 50 weeks: weight, length and head circumference. Based on infants without abnormal fetal growth. |
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Fenton 2025 size at birthNewborn infants, 22 3/7 to 42 3/7 weeks at birth: weight, length and head circumference at birth. An approximation of the authors' own size-at-birth calculator. |
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Fenton 2013Preterm infants, 22½ to 50 weeks: weight, length and head circumference. Based on population-based birth-size data. |
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Olsen 2010Preterm infants, 23 to 41 completed weeks: weight, length and head circumference at birth. Based on U.S. birth-size data. |
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Olsen 2015 BMIU.S. preterm infants, 24 to 41 completed weeks: BMI. |
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INTERGROWTH-21st size at birthNewborn infants, 24 to 42 completed weeks at birth: weight, length, head circumference and weight-to-length ratio at birth. |
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INTERGROWTH-21st postnatal growthPreterm infants, 27 to 64 weeks postmenstrual age: weight, length, head circumference and weight-for-length. |
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Infants and young children | |
CDC 0–36 monthsU.S. infants and children, birth to 36 months: weight, length, head circumference and weight-for-length. |
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WHO 0–24 monthsInfants and children, birth to 24 months: weight, length, head circumference and weight-for-length. |
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WHO 0–5 years (daily)Infants and children, birth to 5 years: weight, length/height, head circumference, BMI and weight-for-length/height. |
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WHO Canada 0–24 monthsInfants and children, birth to 24 months, as on the Canadian charts: weight, length, head circumference and weight-for-length. |
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Children and adolescents (2–20 years) | |
CDC 2–20 yearsU.S. children and adolescents, 2 to 20 years: weight, stature (height), BMI and weight-for-stature. BMI at the 95th percentile and above uses CDC's extended method. |
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WHO 5–19 yearsChildren and adolescents, 5 to 19 years: height and BMI, and weight to 10 years. |
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WHO Canada 2–19 yearsChildren and adolescents, 2 to 19 years, as on the Canadian charts: weight (to 19 years), height and BMI. |
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Special populations | |
Down syndrome (Zemel) 0–36 monthsU.S. children with Down syndrome, birth to 36 months: weight, length, head circumference and weight-for-length. |
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Down syndrome (Zemel) 2–20 yearsU.S. children with Down syndrome, 2 to 20 years: weight, height, head circumference and BMI. |
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Cerebral palsy (Brooks) 2–20 yearsChildren with cerebral palsy, 2 to 20 years, by GMFCS level: weight, height and BMI. |
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Arm circumference and skinfolds | |
Arm circumference (Abdel-Rahman) 2 months–18 yearsU.S. children, 2 months to 18 years: mid-upper arm circumference. From NHANES 1999–2012; not a CDC-published chart, formerly listed as CDC arm circumference. |
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Arm circumference (Mramba) 5–19 yearsChildren and adolescents, 5 to 19 years: mid-upper arm circumference. Consistent with the WHO growth standards. |
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WHO arm circumference and skinfolds 3–60 monthsInfants and children, 3 to 60 months: mid-upper arm circumference, triceps and subscapular skinfolds. |
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Skinfolds (Addo) 1.5–20 yearsU.S. children and adolescents, 1.5 to 20 years: triceps and subscapular skinfolds. From NHANES; not a CDC-published chart. |
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Legacy charts | |
Fenton 2003 (legacy)Legacy chart, replaced by Fenton 2013 and 2025. Preterm infants, 22 to 50 completed weeks: weight, length and head circumference, one chart for both sexes. |
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Other tools
2022 AAP hyperbilirubinemia management guidelines
For newborns 35+ weeks gestation. Decision support for phototherapy, escalation of care, and post-discharge follow-up. Assess trends with multiple points.
Parenteral nutrition calculations
Enter fluid volume, dextrose, and goals for amino acids and lipids, and will calculate PN composition, GIR, and estimated osmolarity.
Links to Off-site Web Resources
NCBI PubMed
PubMed comprises citations for biomedical literature from MEDLINE, life science journals, and online books.
Newborn Weight Tool
Newt, from Penn State Health. Plots percentage weight change in breast and formula-feeding newborns on percentile curves.
PediTools
The goal of PediTools is to provide medical calculators for pediatric providers. PediTools was launched in January 2012.
Now available for iPhone and iPad
MAJOR UPDATES
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Patient growth chart plotting and bulk analysis for all charts
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Added: WHO 0-5 years (daily) and 5-19 years; WHO Growth Charts for Canada; INTERGROWTH-21st size at birth and postnatal growth; cerebral palsy, Fenton 2025 size at birth
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Added: consolidated tool for hyperbilirubinemia decision support
Please contact me with any problems or suggestions.
Citing: If you use PediTools, please consider citing: Chou JH et al., J Med Internet Res 2020;22(1):e16204 [open access PDF]
PediTools
© 2012 – 2026 Joseph Chou