Due Date Calculator
Calculate your estimated due date (EDD), current gestational age, trimester progress, and fetal growth milestone schedule.
Uses standard clinical Naegele’s Rule calculations adjusted for menstrual cycle length, conception date, IVF transfer date, or ultrasound findings.
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November 15, 2026
Gestational Age: 12 Weeks, 3 Days
Key Pregnancy Milestones
Estimated timeline of important fetal development milestones based on your calculation:
| Milestone Event | Estimated Date |
|---|---|
| Fetal Heartbeat Detectable (~6 Wks) | March 08, 2026 |
| End of 1st Trimester (~12 Wks) | April 19, 2026 |
| Fetal Sex Identifiable via Ultrasound (~18-20 Wks) | May 31, 2026 |
| End of 2nd Trimester (~27 Wks) | August 02, 2026 |
| Full-Term Pregnancy (39 Wks) | November 08, 2026 |
Frequently Asked Questions (FAQ)
Why does the due date formula assume a 28-day cycle?
Naegele’s standard rule assumes a traditional 28-day menstrual cycle with ovulation occurring on day 14. This calculator automatically adjusts your due date if your average cycle length is shorter or longer than 28 days.
What is the difference between Gestational Age and Embryonic Age?
Gestational age is measured from the first day of your last menstrual period (LMP). Embryonic age (the actual age of fertilization) is typically 2 weeks younger than gestational age.
Why might an ultrasound due date differ from an LMP due date?
First-trimester ultrasounds directly measure fetal Crown-Rump Length (CRL). If the discrepancy between ultrasound and LMP dates is greater than 5 to 7 days, clinicians typically rely on the ultrasound due date.