Enter your embryo transfer, retrieval, or IUI date to calculate your highly accurate estimated due date (EDD).
Estimated IVF Due Date
Thursday, April 22, 2027
Current Gestation: 2 weeks and 5 days
Note: IVF and IUI due dates are highly accurate because the exact date of fertilization or transfer is known. However, it is still an estimate. A full-term pregnancy is considered anywhere between 39 weeks and 40 weeks 6 days.
Last updated: August 2026
Calculating Your Due Date After Fertility Treatment
Congratulations on your upcoming transfer or positive beta! If you conceived via In Vitro Fertilization (IVF) or Intrauterine Insemination (IUI), traditional pregnancy calculators won't work for you. Because your menstrual cycle was medically managed, using your Last Menstrual Period (LMP) will result in an inaccurate due date. Our IVF Due Date Calculator uses the exact date of your procedure to give you the most accurate timeline possible.
The Math Behind IVF Due Dates
A standard pregnancy lasts an average of 280 days from the last period, or 266 days from the actual day of conception (fertilization). In the IVF world, we know exactly when fertilization happened, which allows us to do exact math.
Egg Retrieval Date: If you had a fresh transfer, the retrieval date is the exact day of fertilization. Due Date = Retrieval + 266 days.
3-Day Embryo Transfer: The embryo grew in the lab for 3 days before being transferred. Due Date = Transfer Date + 266 days - 3 days.
5-Day Embryo Transfer (Blastocyst): The embryo grew in the lab for 5 days. This is the most common timeline for a Frozen Embryo Transfer (FET). Due Date = Transfer Date + 266 days - 5 days.
IUI (Insemination): Insemination is timed precisely with ovulation. We treat the IUI date as the conception date. Due Date = IUI Date + 266 days.
Is this due date guaranteed?
While the conception date in IVF is a known fact, the actual birth date is still a biological estimate. Babies mature at different rates. A full-term pregnancy is technically anywhere between 39 weeks and 40 weeks and 6 days. Only about 4% to 5% of all babies (IVF or otherwise) are born on their exact estimated due date.
This tool is for informational purposes only and isn't a substitute for guidance from your fertility clinic or healthcare provider.
Frequently Asked Questions
In a standard pregnancy, doctors estimate the date of conception based on the first day of your last period. In IVF and IUI, the exact date of fertilization or embryo transfer is known down to the hour. This eliminates the guesswork of predicting ovulation.
For a 5-day embryo transfer (a blastocyst), we assume fertilization happened 5 days prior to the transfer. We take the transfer date, add 266 days (standard gestation from conception), and subtract the 5 days the embryo was growing in the lab. This is Transfer Date + 261 days.
You shouldn't! During an IVF cycle, your natural menstrual cycle is heavily suppressed and controlled by hormones. The length of your cycle leading up to a frozen embryo transfer (FET) is artificial, so traditional pregnancy math based on your last period will give you the wrong due date.
Use the Egg Retrieval Date option rather than a transfer-day option, since fertilization happens on the day of retrieval itself in a fresh cycle.
That's not a separate option here. A true 6-day transfer would add 260 days (266 minus 6) rather than 261. Selecting '5-day' gets you within a day of the correct estimate.
Yes. The calculation is based purely on the transfer or retrieval date, not genetic origin, so it applies the same way regardless of whether you used your own or donor eggs/embryos.
No — treat this as a quick personal reference alongside your clinic's calculation, not a replacement for it. Your fertility team's due date is based on your exact protocol and monitoring, and is the most authoritative estimate.