Corrected Age Calculator
A baby born early is often measured from the due date rather than the birth date. This page shows the age since birth, the weeks born early, and the corrected figure.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Chronological age is the time since birth, in weeks. The weeks born early are the time from birth to the due date. The corrected age is the chronological age minus those weeks.
The calculator counts calendar days between your dates and shows the result in weeks.
Worked example
Born on 2026-06-01 with a due date of 2026-07-20, a baby is 22.4 weeks old on 2026-11-05, which gives a corrected age of 15.4 weeks.
Questions
Why use a corrected age?
Some care teams count from the due date when they talk about a baby's growth. Ask your baby's doctor which age they use.
Is this for every baby?
It is most often used for babies born early. Babies born at full term usually do not need a corrected age.
Does this give medical advice?
No. It only does date arithmetic. Your baby's doctor or care team decides what the numbers mean.
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