IVF due date calculator
IVF and FET due date calculator
Enter your transfer date and embryo age, or your egg retrieval or IUI date, to see your due date and how far along you are.
Updated
In short
How is an IVF due date calculated?
With IVF the day of fertilisation is known, so the due date is 266 days after it. For a transfer, take the embryo's age away from the transfer date first: a day-5 embryo transferred on a given day gives a due date 261 days later. ACOG recommends dating IVF pregnancies this way. Frozen and fresh transfers use the same method.
Your estimate
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This is an estimate, not a diagnosis or birth control.
General information, not medical advice. Your doctor or midwife can tell you what your own results mean.
How it's calculated
- Fertilisation date = transfer date − embryo age (3, 5 or 6 days), or your egg retrieval or IUI date.
- Due date = fertilisation date + 266 days.
- Weeks pregnant are counted from 14 days before fertilisation, like a natural cycle.
- Frozen (FET) and fresh transfers, own or donor eggs, all use the same maths.
Gyne learns your real cycle and adjusts these estimates as you log.
Frequently asked questions
Is an IVF due date more accurate?
Yes. Because the date of fertilisation is known, the due date doesn't depend on a period date. ACOG recommends using it rather than redating by ultrasound.
Does a frozen embryo transfer change the due date?
No. What matters is the embryo's age and the transfer date, not when the embryo was frozen.
Why am I already 2 weeks pregnant on transfer day?
Pregnancy is counted as if from a last period, 14 days before fertilisation. A day-5 embryo transfer happens at 2 weeks 5 days.
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