IVF Due Date Calculator

Start with the embryo transfer date, then subtract the embryo age from 266 days. In practical terms, add 263 days for a day 3 embryo or 261 days for a day 5 embryo. Your clinic's documented due date should take priority if it differs from this estimate.

You are not counted as 0 weeks pregnant on transfer day. A day 3 transfer is dated as 2 weeks and 3 days pregnant, while a day 5 transfer is dated as 2 weeks and 5 days. Fourteen days after a day 5 transfer, for example, the gestational age is 4 weeks and 5 days.

Yes. The embryo age still drives the math, so a frozen and fresh transfer on the same calendar day with the same embryo age produce the same estimated due date. The treatment path changes, but the post-transfer dating formula does not.

IVF dating has less timing uncertainty because both embryo age and transfer date are known. The due date is still an estimate of when delivery may happen, not a prediction of the exact birth date. Continue to use the date and monitoring schedule provided by your clinic.

No. The estimated due date formula is the same for singleton and twin pregnancies. Twin pregnancies often deliver before 40 weeks, however, so monitoring and delivery planning may differ. Follow the schedule provided by your obstetric team.

Your clinic may use details from the treatment record or clinical findings that a browser calculator cannot evaluate. Use the due date in your medical record if it differs, and follow your care team's testing and scan schedule. For a pregnancy that did not involve embryo transfer, our due date calculator uses last period, ovulation, conception, or ultrasound dating instead.