IVF Due Date Calculator
Enter your transfer date and the type of transfer. The calculator gives your estimated due date, how many weeks pregnant you are today and when each trimester starts. It works for fresh and frozen transfers.
Free, no sign-up. What you enter stays in your browser: it is not saved or sent to HerFound. Reviewed .
Fresh and frozen transfers are worked out the same way.
Enter your transfer, egg retrieval or IUI date to see your estimated due date.
This is general information, not medical advice. It cannot take your own health history into account. For anything that worries you, speak to a doctor, midwife or pharmacist.
How it works
With IVF the age of the embryo is known, so the due date is counted from fertilisation and not from a period. A pregnancy lasts 266 days (38 weeks) from fertilisation. Due date = egg retrieval date + 266 days.
For a transfer, the embryo's age on transfer day is taken off: day 3 transfer + 263 days, day 5 (blastocyst) transfer + 261 days, day 6 transfer + 260 days. An IUI date is treated like the egg retrieval date, + 266 days.
A frozen embryo transfer (FET) uses the same sums. What counts is how many days old the embryo was when it was frozen, not how long it was stored.
Weeks pregnant are counted the usual way, from an equivalent last period date. That date is the due date minus 280 days, which is 14 days before fertilisation. This is why you are already 2 weeks and 5 days pregnant on the day of a day 5 transfer.
What it cannot tell you
- It is an estimate of the due date, not of the birth date. Most babies are born in the two weeks either side, and twin or triplet pregnancies are often born earlier.
- It cannot tell you whether a transfer has worked. Only the pregnancy test and scans arranged by your clinic can do that.
- With IUI, ovulation and fertilisation can happen a day or so after the procedure, so the date is slightly less exact than with IVF.
- If your clinic gives you a different due date, use theirs.
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Common questions
For a day 5 embryo transfer, the due date is the transfer date plus 261 days. A day 5 transfer on 1 January gives a due date of 19 September. The same rule applies to fresh and frozen day 5 blastocysts.
For a day 3 embryo transfer, the due date is the transfer date plus 263 days. A day 3 transfer on 1 January gives a due date of 21 September. This is 266 days from fertilisation, less the 3 days the embryo had already grown.
No, the due date for a frozen embryo transfer is worked out the same way as for a fresh one. It depends on the age of the embryo at freezing, usually day 3, 5 or 6, and the date of the transfer. The time the embryo spent frozen does not count.
On the day of a day 5 embryo transfer you are counted as 2 weeks and 5 days pregnant. On the day of a day 3 transfer you are 2 weeks and 3 days pregnant. Pregnancy weeks include the 2 weeks before fertilisation, so that IVF and other pregnancies are counted in the same way.
An IVF due date is usually more exact than one worked out from a last period, because the fertilisation date is known. ACOG guidance says the embryo's age and the transfer date should be used to set the due date in an IVF pregnancy. It is still an estimate of when the baby will arrive.