Conception Calculator
Enter conception date to estimate due date.
A conception calculator estimates the date of conception based on a known due date or last menstrual period (LMP). Conception typically occurs 14 days after the LMP in a 28-day cycle, about the time of ovulation.
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Tip: The estimated conception date is useful for determining the father when timing is uncertain, but DNA testing remains the only definitive method for paternity confirmation.
- 1From LMP: conception = LMP + ~14 days (ovulation day)
- 2From due date: conception ≈ due date − 266 days (38 weeks)
- 3From due date (Naegele): LMP = due date − 280 days, then add 14
- 4Early ultrasound (6–10 weeks) gives the most accurate conception date estimate
| Event | Timing from LMP |
|---|---|
| Last menstrual period (Day 1) | Day 0 |
| Ovulation / Conception window | Day 11–17 |
| Implantation | Day 18–25 |
| Pregnancy test positive | Day 28–35 |
| Heartbeat visible (ultrasound) | Week 6 |
| End of 1st trimester | Week 13 |
| Due date (EDD) | Week 40 |
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Fun Fact
Only about 4% of babies are born on their exact due date. The average first pregnancy goes 41 weeks and 1 day. The conception date itself is often uncertain — fertilization can occur up to 5 days after intercourse.
References
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