Expected date of delivery calculation for last period at June 30
Reading File
Using Naegele's Rule: EDD = LMP + 9 months + 7 days (or equivalently, LMP + 1 year − 3 months + 7 days).
LMP: June 30 (year assumed 2025, the most recent past June 30)
Calculation:
| Step | Date |
|---|---|
| LMP | June 30, 2025 |
| +9 months | March 30, 2026 |
| +7 days | April 6, 2026 |
Expected Date of Delivery (EDD): April 6, 2026
Since today is May 7, 2026, this EDD has already passed — the pregnancy would currently be approximately 40 weeks + 5 days (past the due date).
Key Points
- Gestational age today (May 7, 2026): ~40 weeks 5 days from LMP
- Trimester breakdown:
- 1st trimester: June 30 – Sept 29, 2025
- 2nd trimester: Sept 30 – Jan 5, 2026
- 3rd trimester: Jan 6 – April 6, 2026
- Term range: 37–42 weeks = Feb 3, 2026 – Aug 11, 2026
Naegele's Rule assumes a regular 28-day cycle with ovulation on day 14. For irregular cycles, ultrasound dating (ideally at 11–14 weeks) is more accurate.
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