Corrected Age Calculator for Premature Babies
Fill in the values and the answer updates as you type.
How the Corrected Age Calculator for Premature Babies works
Corrected age = actual age − the number of weeks the baby was born before the due date. Doctors commonly use corrected age to judge growth and milestones such as rolling and sitting until about age 2. Weeks early = 40 − gestational age at birth. Months use an average of 30.4375 days. Ask your pediatric team how long to use corrected age for your child. Example: with Date of birth 2026-04-20, Calculate age on 2026-10-07, and Weeks born before due date 6 weeks, the result is Corrected age (months) = 4.2; Corrected age (weeks) = 18.3; Actual age (months) = 5.6.
Inputs and results
The Corrected Age Calculator for Premature Babies takes 3 inputs and gives 4 results.
What you enter
- Date of birth — starts at 2026-04-20.
- Calculate age on — starts at 2026-10-07.
- Weeks born before due date (weeks) — starts at 6.
What you get
- Corrected age (months)
- Corrected age (weeks)
- Actual age (months)
- Actual age (weeks)
Corrected Age Calculator for Premature Babies FAQ
How do I use the Corrected Age Calculator for Premature Babies?
Enter date of birth, calculate age on and weeks born before due date in the fields, then read corrected age (months), corrected age (weeks), actual age (months) and actual age (weeks) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Corrected Age Calculator for Premature Babies calculate?
Adjusted age of a baby born early, for milestone tracking. It returns corrected age (months), corrected age (weeks), actual age (months) and actual age (weeks) from the 3 values you provide.
What values does the Corrected Age Calculator for Premature Babies start with?
It opens with date of birth 2026-04-20, calculate age on 2026-10-07 and weeks born before due date 6 weeks so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Corrected Age Calculator for Premature Babies free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Corrected Age Calculator for Premature Babies for medical or health decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm medical or health decisions with a qualified professional. See the Disclaimer for more.