Neonatal Gestational Age Calculator
Calculate gestational age at birth, postmenstrual age (PMA), day of life, and corrected age for preterm growth chart plotting.
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Sources and Reference Basis
Gestational age calculations follow standard obstetric and neonatal conventions: 280 days from LMP to term, PMA = GA at birth + day of life, corrected age subtracts weeks born early when comparing to term growth references.
- AAP Clinical Report: Age terminology during the perinatal period Standard definitions for GA, PMA, and corrected age.
- Fenton 2013 preterm growth Plot growth measurements using computed PMA.
- Ballard score Clinical estimation of gestational age at birth.
Frequently Asked Questions
What is postmenstrual age (PMA)?
PMA is gestational age at birth plus day of life, expressed in weeks. It is the x-axis for most preterm growth charts.
What is corrected age?
For infants born preterm, corrected age subtracts the weeks born early from PMA when comparing to term growth references after discharge.