IVF Due Date Calculator

Calculate your estimated due date from IVF embryo transfer date and embryo age, with gestational age, trimester, and weeks remaining.

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Transfer Details

Enter your embryo transfer date to calculate your estimated due date.

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Health — Fertility

IVF Due Date Calculator

In IVF, the embryo transfer date is a precise known point in conception history — unlike natural conception. The age of the embryo at transfer (day 3 or day 5) determines how many days before the equivalent "conception" the transfer occurred, which in turn sets the estimated due date and gestational age.

How IVF due dates are calculated

For a day-5 (blastocyst) transfer, the EDD is transfer date + 261 days. For a day-3 (cleavage-stage) transfer, the EDD is transfer date + 263 days. This reflects the standard convention that conception occurred on the day of egg retrieval (day 0), and the EDD is 266 days from conception.

The equivalent LMP is EDD minus 280 days — the same Naegele's rule basis used in natural conception. Gestational age is then counted from this equivalent LMP.

EDD (day-5) = transfer date + 261 days

Blastocyst transfer

EDD (day-3) = transfer date + 263 days

Cleavage-stage transfer

Confirming gestational age by ultrasound

While the mathematical EDD from transfer date is precise, most fertility clinics also confirm gestational age by crown-rump length (CRL) at the 7–8 week scan. If the CRL measurement differs significantly from the transfer-based gestational age, the ultrasound date takes precedence in some clinical settings.

After graduation from the fertility clinic, your obstetric team will set the official EDD — usually confirmed at the 12-week dating scan.

Frequently asked questions

Does embryo freezing (FET) change the calculation?

No — the calculation uses the transfer date regardless of whether the embryo is fresh or frozen. What matters for the due date is when the embryo was placed in the uterus and its age at that point.

 Why is my IVF due date different from the dating scan?

Embryo growth rates vary. If CRL measurements indicate a slightly different gestational age at the first scan, your fertility specialist or midwife may adjust the EDD accordingly. Minor discrepancies of 3–5 days are common.

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