IVF Due Date Calculator
Calculate your IVF due date from a day-3, day-5 or day-6 embryo transfer (fresh or frozen), egg retrieval or IUI date — plus how many weeks pregnant you are.
How is an IVF due date calculated?
With IVF the day of fertilisation is known exactly, so the due date is more precise than with a natural pregnancy. The embryo’s age at transfer is added back so the date lines up with the usual 40-week (280-day) count from a “last period”. Fresh and frozen (FET) transfers are calculated the same way.
| You know | Due date = |
|---|---|
| Day-3 embryo transfer | Transfer date + 263 days |
| Day-5 blastocyst transfer | Transfer date + 261 days |
| Day-6 blastocyst transfer | Transfer date + 260 days |
| Egg retrieval (fertilisation) date | Retrieval date + 266 days |
| IUI date | IUI date + 266 days |
Your clinic may give a date that differs by a day or two depending on how they count, and your obstetrician may adjust it after the first-trimester scan.
Next: follow your pregnancy with the pregnancy week calculator and a trimester-wise diet plan.
Frequently asked questions
Is the due date different for a frozen embryo transfer?
No. For a frozen transfer (FET) use the transfer date and the embryo’s age (day 3, 5 or 6) — the calculation is the same as for a fresh transfer.
How many weeks pregnant am I on the day of a day-5 transfer?
About 2 weeks and 5 days, because pregnancy is counted as if from a period about 2 weeks before fertilisation.
Are IVF babies born earlier?
IVF pregnancies — especially twins — have a slightly higher chance of preterm birth. Single IVF babies are usually born close to term.
Sources: ACOG: Methods for estimating the due date · NHS: IVF
Reviewed for accuracy against the sources above. This page is general information, not medical advice — talk to your doctor or a registered dietitian about your own needs.