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.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
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.
Example. Last menstrual period 1 January 2024 with a 28 day cycle returns a due date of 7 October 2024, which is 280 days later.
Limit. The cycle field is clamped to 21 through 35 days; conception mode adds 266 days, and an IVF transfer subtracts an embryo age of 3 or 5 from 266.