| Milestone | Week | Date |
|---|
Use this free pregnancy due date calculator to estimate your EDD (Estimated Due Date) from LMP (last menstrual period), conception/ovulation, or IVF transfer (day-3/day-5/day-6). You’ll also see your gestational age today (weeks + days), trimester, key milestones, and a week-by-week timeline.
Note: Results are estimates for general guidance. Always confirm dates with your midwife/clinician or by ultrasound.
Uses Naegele’s rule (LMP + 280 days) and adjusts for your average cycle length (e.g., longer cycles ovulate later → due date shifts later).
Adds 266 days to the conception/ovulation date. Useful if you tracked ovulation or had a timed IUI.
Calculates EDD = transfer date + (266 − embryo day).
Examples: Day-5 blastocyst → +261 days; Day-3 embryo → +263 days.
Milestone timings vary by country and provider. Use this as a general guide.
Q: How accurate is a due date calculator?
A: It provides a best estimate based on dates. Early ultrasound can refine dating and may update the official EDD.
Q: My cycles are irregular—what should I use?
A: If you know your ovulation date, use Conception/Ovulation. Otherwise use LMP with your typical cycle length, and confirm via scan.
Q: LMP vs. Conception—why are they different by ~2 weeks?
A: Gestational age is conventionally measured from LMP, which is ~2 weeks before conception in a typical 28-day cycle.
Q: IVF day-3 vs day-5—does it change the due date?
A: Yes. We account for embryo day at transfer (e.g., Day-5 → add 261 days).
Q: Can my due date change after ultrasound?
A: Yes. If an early scan date differs by more than a small margin, clinicians may re-date the pregnancy using ultrasound measurements.
Q: How many weeks is a full-term pregnancy?
A: 40 weeks is the standard EDD, but term spans roughly 37–42 weeks.
Q: What about twins or multiples?
A: Multiples often deliver earlier. Use this calculator for a rough guide and follow specialist advice for twin/multiple pregnancies.
Q: What does EDD vs. EDC mean?
A: EDD (Estimated Due Date) and EDC (Estimated Date of Confinement) are used interchangeably.