Adjusted Age Calculator

Your details

Choose whether you know the gestational age at birth (most common) or the original estimated due date.
Your baby's actual date of birth.
Today's date, or the date you want to assess development at.
How many completed weeks gestation your baby was born at. Full term is 39-40 weeks. Preterm is before 37 weeks.
weeks
The additional days beyond completed weeks, if known (0-6).
days
Adjusted (corrected) ageModerately preterm (32-33 weeks)
36days

Age in days after subtracting weeks of prematurity from chronological age

Adjusted age (readable)1 month, 5 days
Chronological age92days
Chronological age (readable)3 months
Weeks premature8weeks
Estimated catch-up period80weeks
18-month adjusted age date2028-01-01
24-month adjusted age date2028-07-02
Age correction still needed?Yes - use corrected age until 2028-07-02
36 days adjusted
  • Birth
  • 6 months
  • 1 year
  • 18 months
  • 24 months (stop correcting)

Adjusted age: 1 month, 5 days (8.0 weeks corrected from chronological age of 3 months)

  • Your baby was born 8.0 weeks before full term. Their adjusted age is 1 month, 5 days, while their chronological age is 3 months.
  • Age correction is still recommended. Use 1 month, 5 days when checking developmental milestones until the 24-month adjusted age mark on 2028-07-02.
  • Research suggests catch-up development takes roughly 80 weeks (10 weeks per week of prematurity) as a general guide, though individual variation is significant.

Next stepShare this corrected age (1 month, 5 days) with your pediatrician, therapists, and childcare providers so milestones are assessed fairly.

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