Estimate your due date, current pregnancy week, and key milestones from your embryo transfer date and embryo age.
How to Use an IVF Due Date Calculator
Use your transfer date first, then match the embryo day.
1
Enter Your Embryo Transfer Date
Start with the transfer date recorded by your clinic, not egg retrieval day or the first day of your last period.
2
Match the Embryo Age to the Transfer
Choose day 3 or day 5 exactly as documented by your clinic. That two-day difference changes the due-date calculation.
3
Review Due Date and Pregnancy Weeks
See the estimated due date, current gestational age, equivalent LMP date, and milestone dates from 6 to 40 weeks.
Why Use This IVF Due Date Calculator
Built for embryo transfer timing, not generic cycle math.
Dates Pregnancy From Transfer Timing
Unlike a general pregnancy calculator, this tool uses the known embryo transfer date and embryo age instead of estimating ovulation from a menstrual cycle.
Supports Day 3 and Day 5 Transfers
The estimate adds 263 days for a day 3 transfer or 261 days for a day 5 transfer, matching the embryo-age method used in ART pregnancy dating.
Works for Fresh and Frozen Transfers
Fresh and frozen transfers use the same dating rule when the transfer date and documented embryo age are the same.
Quick Tips
Day 5 transfer: add 261 days
ACOG's ART dating guidance uses the embryo age and transfer date. A day 5 transfer therefore has 261 days remaining to the 40-week estimated due date.
Day 3 transfer: add 263 days
A day 3 embryo is two days younger at transfer, so the estimate is two days later than it would be for a day 5 transfer on the same date.
Frozen transfer math stays tied to embryo age
Frozen transfer, FET, and donor egg cycles can use the same rule once the clinic-documented embryo age and transfer date are known.
Early ultrasound is still the best confirmation step
Your clinic will use the documented embryo age and transfer date to assign an ART due date. Early ultrasound remains important for checking development, but follow the date recorded by your care team if it differs from this estimate.
IVF Due Date Calculator FAQ
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.
This calculator provides estimates only. Not for medical use. Consult your doctor for personal advice.
Want to Keep Your Dates Organized?
Use the private tracker to keep cycle dates and reminders together on your own device. Continue to follow your clinic's IVF calendar for treatment and scan appointments.