Corrected GA Calculator
Post-menstrual age (PMA) for preterm infants
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 →