Due Date Calculator
Get your estimated due date instantly from whichever starting point you know, along with your current week and days remaining until full term.
Estimated due date
Tuesday, June 1, 2027
Full term begins (39 weeks)
Tuesday, May 11, 2027
Days remaining
280 days
Only about 4-5% of babies arrive exactly on their due date; most are born between 37 and 42 weeks.
How to Use the Due Date Calculator
- Select whether you know your LMP, conception date, IVF transfer date, or ultrasound gestational age.
- Enter the date and any additional detail such as embryo age.
- See your estimated due date, current pregnancy week and countdown to full term.
Formulas Used
Naegele's rule: EDD = LMP + 1 year − 3 months + 7 days (≈ LMP + 280 days)
Conception-based: EDD = conception + 266 days
Blastocyst transfer: EDD = transfer + 261 days
Frequently Asked Questions
How likely am I to deliver on my exact due date?
Only about 4-5% of babies are born precisely on their due date. Most arrive within the window from one week before to one week after.
What counts as full term?
Early term is 37-38 weeks, full term 39-40 weeks, late term 41 weeks and post-term 42 weeks or more. Babies born at 39-40 weeks generally have the best outcomes.
Should I trust my scan due date or my LMP date?
If a first-trimester ultrasound differs from the LMP estimate by more than 5-7 days, clinicians usually adjust the official due date to the scan finding.
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