Pediatric growth charts & percentile calculators
This pediatric growth chart calculator hub organizes the most used percentile calculators for height, weight, BMI, and head circumference using CDC and WHO references. Use it for screening, counseling, and follow‑up, then interpret trends over time to understand growth velocity and overall health.
Percentiles are a comparison tool, not a diagnosis. The most important signal is the direction of the trend across multiple visits with consistent measurement technique.
Start with the "Most used tools" list below, then dive into focused guidance on adjusted age, head circumference, and family counseling.
Last reviewed: 2026-02-25
Most used growth & percentile tools
Start with these high‑value pediatric growth calculators, then explore the focused sections below for clinical reminders and counseling tips.
- Pediatric BMI calculator — body mass index before percentile interpretation.
- BMI percentile calculator — screening for underweight/overweight trends.
- Height percentile calculator — stature tracking over time.
- Weight percentile calculator — baseline growth and weight velocity.
- Head circumference percentile — infant brain growth monitoring.
- Adjusted (corrected) age calculator — preterm growth tracking.
- Gestational age calculator — PMA and preterm dating.
- Fenton growth chart — Fenton 2025 vs 2013 chart chooser.
- Fenton 2013 vs 2025 — preterm chart-version comparison.
- Fenton 2013 growth calculator — legacy preterm chart workflow.
- Fenton 2025 growth calculator — preterm PMA and chart handoff.
- Olsen 2010 growth calculator — 23-to-41-week preterm size context.
- Olsen 2015 BMI calculator — 24-to-41-week preterm BMI context.
- CDC growth calculator 0 to 36 months — CDC infant chart-specific percentile output.
- CDC growth calculator 2 to 20 years — CDC child and teen chart-specific output.
- WHO growth calculator 0 to 24 months — routine infant WHO chart output.
Order reflects common growth‑percentile workflow and clinical follow-up needs.
Growth tool pathways
Use this hub as a growth-tools index: start with the immediate measurement question, then open the supporting calculator when interpretation depends on age, sex, family height, or prematurity.
- BMI screening
Calculate BMI first, then use age- and sex-specific percentile interpretation for children and teens.
- Linear growth
Pair current height percentile with family target height when short or tall stature needs context.
- Weight trend
Review weight-for-age alongside BMI when nutrition, illness, or growth velocity is the question.
- Infant head growth
Track head circumference with weight and length so infant growth patterns stay symmetric.
- Preterm growth
Use corrected age and preterm chart context before moving former preterm infants onto term charts.
Clinical disclaimer
How to use these tools
- Confirm age units (months vs. years) and measurement units (cm vs. inches, kg vs. lb).
- Use serial measurements to assess growth velocity instead of relying on a single visit.
- Interpret results with feeding history, pubertal stage, chronic disease, and family growth patterns.
Small measurement errors can meaningfully shift percentiles, especially in infants. Use consistent technique and calibrated scales or stadiometers whenever possible.
Height, weight & BMI percentiles
Height and weight percentiles describe how a child compares to peers of the same age and sex. BMI percentile incorporates weight and height to screen for underweight, overweight, and obesity in children 2 years and older.
Percentiles should be interpreted as trends. A stable percentile band over time often reflects healthy growth, while a persistent downward shift or rapid acceleration may warrant further evaluation.
- Height percentile calculator
- Weight percentile calculator
- BMI percentile calculator
- CDC growth calculator 2 to 20 years when the chart source must stay CDC for all metrics.
- Confirm age boundaries for BMI percentile (typically 2–20 years).
- Document clothing/diaper adjustments for accurate infant weights.
- Consider pubertal stage and athletic build when interpreting BMI percentiles.
If the BMI percentile is high, focus on nutrition quality, activity, and sleep habits before making assumptions about health risk. Counseling is most effective when framed around healthy routines rather than a target number.
Head circumference & infant growth
Head circumference percentiles are most useful in infants and toddlers, where brain growth is rapid. Track head circumference alongside length and weight to evaluate overall growth symmetry.
Measurement technique matters: the tape should wrap around the occiput and the most prominent part of the forehead. Even small errors can shift percentiles in early infancy.
- Head circumference percentile calculator
- WHO growth calculator 0 to 24 months for routine infant weight, length, head, BMI, and weight-for-length context.
- Recheck if the percentile is unexpectedly high or low.
- Look for crossing percentile lines or changes in head shape.
- Document the measurement method for repeatability.
Sudden shifts in head circumference percentiles warrant prompt evaluation, especially when accompanied by neurologic symptoms or developmental concerns.
Adjusted age & preterm growth
Corrected (adjusted) age helps align preterm infants with developmental and growth milestones. It is calculated by subtracting the weeks of prematurity from chronologic age.
Many clinicians use preterm-specific charts (such as Fenton) until term‑equivalent age, then transition to WHO or CDC charts using corrected age for a period of time. Follow local NICU or outpatient guidance for the timing of that transition.
- Adjusted (corrected) age calculator
- Gestational age calculator for PMA, EDD, corrected age, and day-of-life documentation.
- Document gestational age at birth when calculating corrected age.
- Use corrected age for growth and developmental assessments in early infancy.
- Note the chart source (WHO, CDC, or preterm-specific) in documentation.
Clear documentation of corrected age helps avoid unnecessary referrals and reassures families when growth is appropriate for prematurity.
Preterm and Fenton chart workflow
For preterm infants, use corrected age plus preterm chart context before interpreting growth against term WHO or CDC curves. Fenton and Olsen chart references can help bridge early preterm follow-up before the child transitions to term growth charts.
- Adjusted age calculator for corrected-age setup.
- Gestational age calculator for PMA and preterm dating.
- Fenton growth chart for choosing 2025 vs 2013 and official chart handoffs.
- Fenton 2013 vs 2025 for chart-version transitions and trend notes.
- Fenton 2013 growth calculator for legacy Fenton chart handoff.
- Fenton 2025 growth calculator for PMA and official chart handoff.
- Olsen 2010 growth calculator for U.S. preterm size classification context.
- Olsen 2015 BMI calculator for preterm BMI-for-age context.
- CDC growth calculator 0 to 36 months when the infant chart source must remain CDC.
- Fenton preterm growth chart reference for chart context.
- Weight percentile calculator once term chart interpretation is appropriate.
Document gestational age, corrected age, chart source, and transition timing so follow-up teams know which growth curve was used.
Target height & growth potential
Mid‑parental (target) height offers a rough estimate of expected adult stature based on parental heights. It is a counseling tool, not a prediction, and should be combined with clinical context and growth trends.
When a child’s height percentile is far outside the target range, consider family history, chronic disease, endocrine conditions, and nutrition before making assumptions.
- Use accurate, measured parental heights when possible.
- Review growth velocity to distinguish familial short stature from pathology.
- Discuss the limits of prediction when counseling families.
Explaining percentiles to families
Many families interpret percentiles as scores. Reframing percentiles as a comparison tool helps reduce anxiety and keeps the focus on healthy growth patterns.
- Use phrases like "trend line" or "growth curve" instead of "rank."
- Emphasize consistency across visits and overall health.
- Highlight practical steps: sleep, nutrition quality, activity, and routine follow‑up.
If a percentile is concerning, explain what will be monitored, what tests are needed, and how quickly changes are expected. Clear expectations reduce caregiver worry and improve follow‑up.
Common workflows
Standard workflows reduce documentation errors and keep counseling consistent across teams. Use a repeatable approach for each growth visit.
- Routine visit: measure accurately → plot percentiles → document trend → counsel on routine habits.
- Percentile shift: confirm measurements → review history → repeat in 4–8 weeks → assess labs if needed.
- Preterm follow‑up: calculate corrected age → apply preterm/WHO chart → track over multiple visits.
Consistency is key. Use the same chart source, age adjustment method, and measurement tools whenever possible.
Quick visit checklist
- Confirm chart family and age logic first (WHO 0–2 years, CDC 2+ years unless local guidance differs).
- Verify measurement quality before interpretation (calibrated scale/stadiometer, consistent technique).
- Interpret trend direction across visits and document whether percentile bands are stable, rising, or falling.
- Define a clear follow-up plan with timeframe, counseling priorities, and escalation triggers.
Escalation triggers for growth concern
- Crossing two or more major percentile channels with compatible clinical concern.
- Discordant growth pattern (weight, height, and head circumference trends diverge unexpectedly).
- Red-flag symptoms: developmental regression, persistent vomiting, chronic diarrhea, or systemic illness signs.
- Measurement uncertainty that cannot be resolved with repeat technique confirmation.
Handoff documentation template
- Chart source used (WHO/CDC/preterm) and age-adjustment approach.
- Current percentile values and trend direction vs prior visits.
- Measurement quality notes and any repeat confirmations performed.
- Working assessment (normal variant vs concern) and rationale.
- Follow-up interval, counseling plan, and escalation trigger.
References
FAQs
Use WHO standards for ages 0–2 years and CDC growth charts for ages 2+ years in the U.S. Confirm local policy when in doubt.
Use corrected (adjusted) age and consider preterm-specific charts (for example, Fenton) until the infant is ready for term charts.
A percentile shows how a child compares to peers of the same age and sex. It is a rank, not a goal or a diagnosis.
BMI percentiles are typically used for ages 2 years and older. For infants, weight-for-length and head circumference are more appropriate measures.
Crossing two or more major percentile lines or a consistent downward z-score trend can be concerning, especially with other symptoms.
Update whenever new measurements are taken. Growth velocity and trend lines are more useful than a single point.
No. BMI percentile is a screening tool and should be interpreted with diet, activity, pubertal status, and history.
These calculators focus on percentiles. If you need z-scores, consider chart software or your EHR growth tools.
Emphasize trend lines and overall health. Reassure families that percentiles are a comparison tool, not a score to "win."
Technique and equipment differences are common. Re-measure with standardized equipment and compare serial trends before making major decisions.