IVF Due Date Calculator
Work out your IVF due date from the embryo transfer date and embryo age (day 3, 5 or 6), as ACOG recommends, plus weeks pregnant and milestones.
IVF pregnancy dating uses the transfer date and the embryo’s age, excluding time in frozen storage. This calculator applies the 266-day fertilization-based convention to day-3, day-5 or day-6 embryos and shows gestational age on another date. Ask your clinic which embryo age to enter if the culture or thawing schedule makes that unclear.
How to use this tool
- Enter the embryo transfer date (for a frozen transfer, the day of the transfer).
- Choose the embryo's age at transfer, or the egg retrieval option to date from fertilization.
- Leave "Show progress as of" on today or choose another date.
- Read the due date, gestational age and milestone table.
Formula
Due date = transfer date + (266 − embryo age in days)
Fertilization on the egg retrieval day counts as gestational day 14, two weeks after an equivalent last period. A day-5 blastocyst is therefore 2 weeks 5 days along on the day of transfer, leaving 261 days to the due date; a day-3 embryo leaves 263 days and a day-6 blastocyst 260.
Example
A day-5 blastocyst transferred on February 10, 2026 is 2 weeks 5 days along that day, and the due date is 261 days later: October 29, 2026. The equivalent last-period date is January 22, 2026 — adding nine months and seven days to it gives the same due date. A day-3 embryo transferred the same day would be due on October 31, 2026.
Frequently asked questions
Does a frozen embryo transfer change the calculation?
Use the clinic-confirmed developmental age at transfer and the transfer date. Frozen storage does not add gestational age. The back-calculated equivalent fertilization date is a dating reference and can be years after actual egg retrieval.
When can I take a pregnancy test after transfer?
Use the date and test type your clinic specifies. An early home test can be negative despite pregnancy or positive from medication containing hCG; the due-date calculation does not determine when a test will be conclusive.
Will my obstetrician change the IVF due date after a scan?
Usually not. ACOG advises that pregnancies conceived with assisted reproduction be dated from the embryo age and transfer date, so early scans normally confirm rather than replace it.
Sources
This tool gives an estimate for general information only. It is not financial, tax, legal or medical advice — check with a qualified professional before you rely on the result.
Last updated: 2026-10-30