Corrected Gestational Age
AAP corrected gestational age: chronological age minus the weeks of prematurity (before 37 weeks), used until ~2 years.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Chronological age
- 6
- Gestational age at birth
- 28
Result: Corrected age 3.2 months (chronological 6 mo − 12 wk of prematurity).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Use
- aligns developmental expectations with a 40-week term reference; conventionally applied through about 24 months.
What you enter
- Chronological age (months)
- Gestational age at birth (weeks)
How this is calculated
- Formula
- corrected age = chronological age − (40 − gestational age at birth in weeks).
Engle WA; American Academy of Pediatrics Committee on Fetus and Newborn. Age terminology during the perinatal period. Pediatrics. 2004;114(5):1362-1364. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.