A little help from MamaSkin
IVF due date calculator
Start with your embryo transfer date and age at transfer. We’ll work out the calendar estimate.
One less date to work out
Your estimate will appear here
A transfer date and embryo age are all you need.
Dating from your transfer
IVF comes with enough dates to keep track of. Your transfer gives a more specific starting point than a last period, because the embryo’s age is known. You can use this estimate for planning and keep your clinic’s agreed date as the one you follow.
How we calculate it
Due date = embryo transfer date + 266 days − embryo age in days. For a day-3 embryo, that means 263 days after transfer. For a day-5 embryo, it means 261 days. Pregnancy weeks include the conventional two weeks before fertilisation.
This is calendar dating only. It doesn’t measure embryo development, calculate success chances or decide when you should test.
Sources & a note from us
Sources checked 28 October 2026. These organisations have not reviewed or endorsed the tool. General information, not a diagnosis or personal medical advice.
A worked example
A day-5 embryo transferred on 1 October 2026 gives an estimated due date of 19 June 2027. A day-3 embryo transferred on the same date gives 21 June 2027.
Example dates only. Your own result uses the dates you enter.
Your questions, answered
How is an IVF due date calculated?
We add 263 days to a day-3 transfer, or 261 days to a day-5 transfer. This accounts for the embryo’s age within the usual 40-week pregnancy calendar.
Does a frozen transfer change the calculation?
No. Use the transfer date and embryo age your clinic specifies. Time in storage is not added to pregnancy weeks.
What if I had a day-6 embryo transfer?
Ask your clinic which embryo age and due date to use. This tool supports day-3 and day-5 dating only; it does not guess how your clinic dates other transfers.
Can I use a planned transfer date?
Yes, for planning. The result cannot predict implantation, a positive test or the outcome of treatment. Once your clinic gives you an agreed due date, use that for your care and pregnancy weeks.
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