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IVF Due Date Calculator (Day-3 and Day-5 Transfer)

Estimate your due date from the last period, conception date, or IVF transfer, with week-by-week milestones.

Estimated due date

Key milestones

This is an approximate calculation for general orientation, not medical advice. Please talk to your doctor or midwife about your personal dates and care.

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Result

This page opens the due date calculator in IVF mode: enter the embryo transfer date, choose whether a day-3 embryo or a day-5 blastocyst was transferred, and the estimated due date appears instantly along with the current week and milestone dates. After IVF the maths is unusually precise, because the age of the embryo is known to the day.

The calculation works backwards from the standard 266 days after fertilization: a day-5 blastocyst was fertilized five days before the transfer, so 261 days are added to the transfer date; a day-3 embryo gives 263 days. For frozen transfers (FET) the same rule applies — count from the transfer date, not from the retrieval or the original fresh cycle.

Everything is calculated locally in your browser, so treatment dates stay private on your device. The result is an estimate for planning and orientation, not medical advice — your fertility clinic and obstetrician will confirm the official due date, typically at the first ultrasound around 6–8 weeks.

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Accepted Formats & Rules

  • Naegele’s rule with adjustment for cycle length (21–35 days).
  • IVF mode for day-3 and day-5 (blastocyst) embryo transfers.
  • Key milestone dates: weeks 12, 20, 28, and 37.

Key Benefits

✓ Three calculation methods in one place: last menstrual period with cycle-length adjustment, conception date, and IVF embryo transfer.
✓ Shows where you are right now: the current pregnancy week and trimester update automatically from today’s date.
✓ Everything is calculated locally in your browser — no dates are sent to any server or stored anywhere.

Use Cases

  • • Estimate the due date from the first day of the last menstrual period, adjusted for your cycle length.
  • • Calculate the birth date after IVF from the embryo transfer day (day-3 or day-5 blastocyst).
  • • Check the current pregnancy week and trimester, and plan the 12, 20, 28 and 37 week milestones.