IVF Birth Calculator

5 for a blastocyst, 3 for a cleavage-stage embryo, 0 to date from egg retrieval.
Leave blank to report the dating only.
Estimated due date
2026-11-26
Pregnancy Due Date Calculator
Day of the week
Thursday
Dating LMP
2026-02-19
Estimated conception date
2026-03-05
Dating method used
IVF, day-5 embryo transfer
Gestational age today
29w 4d
Weeks pregnant
29
Extra days
4
Gestational age in days
207
Trimester
3
Days until the due date
73
Pregnancy complete
73.93 %
Reaches 24 0/7 weeks
2026-08-06
Reaches 37 0/7 weeks (early term)
2026-11-05
Reaches 39 0/7 weeks (full term)
2026-11-19
Reaches 41 0/7 weeks (late term)
2026-12-03
Reaches 42 0/7 weeks (postterm)
2026-12-10
Worked out from ACOG Committee Opinion No. 700: Methods for Estimating the Due Date and 2 other sources.
At 29 4/7 weeks this pregnancy is preterm (before 37 0/7 weeks).
An estimate from calendar arithmetic, not a clinical assessment. Only about 4% of births occur on the estimated due date; ultrasound dating by a clinician supersedes menstrual dating when they disagree.

How this is worked out

5 steps
  1. Fertilisation is the embryo's day 0: 2026-03-10 - 5 day(s) = 2026-03-05.
  2. Estimated due date = transfer date + 266 - 5 = transfer + 261 days.
  3. ART pregnancies are dated by embryo age, so the dating LMP is fixed at conception - 14 = 2026-02-19 regardless of the patient's own cycle length.
  4. Estimated due date = 2026-11-26 (Thursday).
  5. On 2026-09-14 the pregnancy is 207 days from the dating LMP, i.e. 29w 4d.
Dating milestonestable
labelgestationalAgedate
End of first trimester13 6/7 weeks2026-05-27
Start of second trimester14 0/7 weeks2026-05-28
Anatomy scan window opens18 0/7 weeks2026-06-25
Limit of periviability24 0/7 weeks2026-08-06
Start of third trimester28 0/7 weeks2026-09-03
Early term begins37 0/7 weeks2026-11-05
Full term begins39 0/7 weeks2026-11-19
Estimated due date40 0/7 weeks2026-11-26
Late term begins41 0/7 weeks2026-12-03
Postterm begins42 0/7 weeks2026-12-10

Results are general information, not financial, tax, legal, medical or engineering advice.