Gestational Age Calculator
Gestational Age
Due Date (EDD)
In obstetrics, gestational age is measured from the first day of your last menstrual period (LMP). Even though you aren't technically pregnant for the first two weeks, it is the global standard for tracking fetal development. Once the baby is born, you may need our Adjusted Age Tool if they arrive early.
Knowing your precise weeks and days is vital for timing ultrasounds. This tool provides clarity during a time of great change. You can also project your future child's School Start Year or their very first Half-Birthday milestone.
Pregnancy Timing Questions
Why start from my last period?
Because the exact date of conception is often unknown. This is the medical standard. See our Age Hub for more definitions.
What is considered full term?
A pregnancy is full term at 39 weeks. If your baby is born before 37 weeks, use the Adjusted Age Tool after birth.
How many days is a typical pregnancy?
The average is 280 days. Track the countdown with our Countdown Logic.
Can I see my baby's age in seconds?
After birth, use the Age in Seconds Tool for a live clock.
How do I track development?
For preemies, use Adjusted Age. For older kids, use Chronological Age.
When will my baby start school?
Use our School Start Calculator for enrollment dates.