Corrected GA Calculator
Post-menstrual age (PMA) for preterm infants
Educational decision support only. This is not a medical device or substitute for clinical judgment. Always confirm with your unit's protocol and applicable guidelines before clinical action.
Calculate Corrected Gestational Age
Corrected GA (PMA)
30w 2d PMA
Formula
PMA (days) = (GA weeks × 7) + GA days + DOL
Divide by 7 to express as weeks + days.
Worked example
A 28w2d infant on DOL 14:
(28 × 7) + 2 + 14 = 196 + 2 + 14 = 212 days = 30 weeks 2 days = 30w2d PMA
PMA vs corrected age
- PMA — used during the NICU stay; GA at birth + chronological age
- Corrected age — used after term; chronological age minus weeks of prematurity
- Stop correcting — typically at 2 years of age (sometimes 3) for developmental milestones
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Educational tool. Always verify with your unit's protocol. See all NICU calculators →