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.
All Growth Calculators
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NEW for October 2026: WHO 0-5 years (daily); WHO 5-19 years; WHO Growth Charts for Canada; INTERGROWTH-21st size at birth and postnatal growth; Cerebral Palsy (Brooks 2011)
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Search the complete catalog of PediTools growth calculators
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Preterm | |
Fenton 2025Preterm infants, 22½ to 50 weeks: weight, length and head circumference. Based on infants without abnormal fetal growth. |
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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 newborn sizeNewborn 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 growth (preterm)Preterm 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. |
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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
Fenton 2025 Electronic Growth Chart
Generates a longitudinal growth chart, calculating percentiles and weekly weight change required to maintain percentile.
Fenton 2013 Electronic Growth Chart
Generates a longitudinal growth chart, calculating percentiles and weekly weight change required to maintain percentile.
PediTools Universal: Bulk Calculator + Growth Charts
Universal calculator for 140+ growth curves. Upload CSV file for bulk calculations. Generates growth charts with user-chosen percentiles. Loads slowly and requires a relatively powerful computer.
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.
MAJOR UPDATE 2026-10-18
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Consolidated and audited all growth calculators
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Calculator search and data carryover if using new links (but old links still work)
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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 (Brooks 2011)
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Updated: WHO SD23 correction for beyond 3 SD, when appropriate
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Added: consolidated tool for hyperbilirubinemia decision support
Please contact me if you experience any problems.
Citing: If you use PediTools, please consider citing: Chou JH et al., J Med Internet Res 2020;22(1):e16204 [available open access PDF]
PediTools
© 2012 – 2026 Joseph Chou