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Corrected age calculator for preemies
Compare chronological age, corrected age and postmenstrual age for a premature baby.
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Your result
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THE LITTLE DETAILS
Made for your everyday.
Subtract days born before 40 weeks from chronological age. Before the original due date the result is negative; it is not rounded to zero. Corrected age is commonly used during the first two years, with individual follow-up advice.
American Academy of Pediatrics ↗Sources checked November 8, 2026. Source links do not imply endorsement.
Three small steps
- Choose dates, units and the applicable reference.
- Enter accurate details; read the conditions before calculating.
- Read the result, method and original sources together.
How should I interpret this result?
Subtract days born before 40 weeks from chronological age. Before the original due date the result is negative; it is not rounded to zero. Corrected age is commonly used during the first two years, with individual follow-up advice.