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Module · Pregnancy · Gestational Age
Pregnancy Calculator
Track your pregnancy timeline: gestational age, trimester and estimated due date from your last menstrual period (LMP) or conception date.
Calculate from
Estimates use Naegele's rule (LMP + 280d) or 266 days from conception. Not a substitute for an ultrasound scan.
Your dates
Estimated due date
Sun, February 14, 2027
Days remaining
217
Gestational age today
9w 0d
Trimester 1
1st (0–13w)
2nd (13–26w)
3rd (26–40w)
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Guide
How Pregnancy Calculator works
Step 01
Pick your source
Calculate from Last Menstrual Period (LMP) — Naegele's rule — or from conception date (LMP + 14 days).
Step 02
Enter the date
Optionally adjust cycle length (default 28 days).
Step 03
See your timeline
Gestational age in weeks + days, trimester, estimated due date and a visual timeline.
FAQ
Frequently asked
How is the due date calculated?+
Naegele's rule: EDD = LMP + 280 days. If you have a longer or shorter cycle, adjust the cycle length and the EDD shifts accordingly.
Which trimester am I in?+
First trimester = 0–13 weeks, second = 13–26, third = 26–40.
Should I rely on this instead of an ultrasound?+
No. This is a statistical estimate. Ultrasound dating (especially in the first trimester) is more accurate. Always trust your OB.