Fenton 2025 growth calculator for preterm infants
Prepare postmenstrual age and measurement inputs for the Fenton 2025 third-generation preterm growth chart. This page calculates the age workflow and chart range, then provides a clean handoff to the official percentile and z-score tools.
Last reviewed: 2026-04-28
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What this page calculates
The calculator checks postmenstrual age, confirms whether the infant falls inside the usual Fenton 2025 growth monitoring range, and formats sex plus anthropometric measurements for official percentile calculation.
- Use postmenstrual age at the measurement date, written as weeks plus days.
- Enter weight in grams, head circumference in centimeters, and length in centimeters.
- Use the copied entry package in the official FentonGrowth.ca or PediTools calculator for z-score output.
Why percentile output is a handoff
The University of Calgary Fenton site publishes the chart, plotter, and development paper, but directs users to request growth chart data for reuse. To keep the route accurate and respectful of the source data, this page does not approximate or scrape the 2025 LMS tables.
For clinical interpretation, document the official tool used, the measurement technique, the percentile or z-score, and the trend compared with prior values.
Official percentile tools
Preterm growth workflow
- Confirm gestational age at birth and current postmenstrual age.
- Repeat any unexpected weight, length, or head circumference measurement.
- Calculate percentile and z-score in the official Fenton 2025 tool.
- Compare with prior trend and feeding/clinical context.
- Document the chart source and transition plan to WHO or local term charts.
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References
FAQs
No. It prepares postmenstrual age and measurement inputs, then sends you to the official FentonGrowth.ca or PediTools calculator for exact percentile and z-score output.
The official University of Calgary page says the 2025 growth chart data must be requested for research, institutional, or commercial use. This page avoids recreating data that is not published for direct reuse.
The official bulk processor guide describes growth monitoring for preterm infants born between 22 and 37 weeks through 50 weeks postmenstrual age.
Most workflows transition former preterm infants to term growth charts using corrected age, commonly WHO infant standards in early infancy. Confirm your local NICU or outpatient protocol.
Use sex, postmenstrual age, weight in grams, head circumference in centimeters, and length in centimeters. Repeat unexpected measurements before interpreting the result.