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Calculate your due date from last period, conception date, or IVF transfer.
Calculation Method
Due Date
March 23, 2027
Days Remaining
249
Weeks Pregnant
4 weeks
Trimester
First Trimester
| Milestone | Date |
|---|---|
| First Trimester ends (Week 13) | Sep 15, 2026 |
| Viability (Week 24) | Dec 1, 2026 |
| Second Trimester ends (Week 27) | Dec 22, 2026 |
| Full term (Week 39) | Mar 16, 2027 |
Disclaimer: Due dates are estimates. Fewer than 5% of babies are born on their exact due date. Consult your healthcare provider for medical guidance.
Pregnancy Due Date Calculator estimates your due date via last menstrual period (Naegele's rule with cycle adjustment), conception date, or IVF transfer date, and shows your current trimester and key milestones.
Calculate your estimated due date using last menstrual period (LMP), conception date, or IVF transfer date. See weeks pregnant, trimester, and key milestones.
Select your calculation method: Last Period, Conception Date, or IVF Transfer
Enter the relevant date
For LMP, confirm or adjust your cycle length (default 28 days)
See your due date, weeks pregnant, trimester, and milestone dates
LMP method: Naegele's rule adds 280 days (40 weeks) to the first day of the last menstrual period, then adjusts by (cycle length − 28) days. Conception method: adds 266 days (38 weeks) to the estimated conception date. IVF method: adds 263 days (Day 3 transfer) or 261 days (Day 5 blastocyst). Due date is an estimate; confirm with your OB/GYN or midwife.
The standard method (Naegele's Rule) adds 280 days (40 weeks) to the first day of your last menstrual period. For cycles other than 28 days, the formula adjusts by the difference from 28.
Only about 5% of babies are born on their exact due date. About 80% are born within 2 weeks of the EDD. Early ultrasound (6–12 weeks) is more accurate than LMP-based calculation alone.
First trimester: Weeks 1–13. Second trimester: Weeks 14–27. Third trimester: Weeks 28–40. Full term is considered Weeks 39–40.
For IVF, the due date is calculated from the egg retrieval date plus embryo age at transfer. A Day 5 (blastocyst) transfer: retrieval + 266 days. A Day 3 transfer: retrieval + 268 days.