IVF Due Date Calculator
Get your due date from an IVF transfer date, with the right offset for a 3-day or 5-day embryo transfer.
A day-5 blastocyst transfer counts as 261 days to the due date; a day-3 embryo counts as 263, since it has two fewer days of growth. IVF dates are precise, so this estimate is usually tighter than a period-based one.
How it works
IVF takes the guesswork out of dating because the transfer day is known exactly. That makes the due date more precise than a typical estimate built around an uncertain ovulation date.
The offset depends on the embryo's age at transfer. A 5-day blastocyst transfer puts the due date 261 days later, while a 3-day transfer adds 263 days, since the embryo is two days younger.
Enter your transfer date, pick the embryo age, and the tool counts forward to the due date. As always, an early scan can fine-tune it, but IVF dates rarely need much adjustment.
Frequently asked questions
Why is the offset different for 3-day and 5-day transfers?
A 5-day blastocyst is two days further along than a 3-day embryo, so it needs two fewer days in the uterus to reach full term — 261 days versus 263.
Is an IVF due date more accurate than a natural one?
Usually yes. The exact transfer date removes the uncertainty of guessing when ovulation happened, so the estimate starts from firmer ground.
Does a frozen transfer change the math?
No. Whether the embryo was fresh or frozen, what matters is its age at transfer — 3 days or 5 days — which sets the offset.