IVF Due Date Calculator
Calculate your due date from the embryo transfer date. Works for Day 3, Day 5, Day 6 transfers — fresh and frozen (FET) cycles.
Reviewed by Pregora Editorial Team · Last updated 2026-04-25
Wednesday, December 23, 2026
Day 5 fresh transfer240 days to go
Note:IVF dating is usually more accurate than LMP-based estimates because the embryo age is known precisely. Trust your fertility clinic's date for medical decisions.
Why IVF dating is more accurate
In a natural pregnancy, the exact day of conception is unknown — most calculators add 280 days to the first day of the last menstrual period (LMP) and assume ovulation on day 14. With IVF, the embryo age and transfer date are precisely documented. We count 266 days from conception (the day eggs were retrieved), then subtract the embryo's age at transfer to get to the transfer-date math used above.
- Day 3 transfer: EDD = transfer date + 263 days
- Day 5 transfer: EDD = transfer date + 261 days
- Day 6 transfer: EDD = transfer date + 260 days
Frequently asked questions
How is an IVF due date different from a natural pregnancy due date?▾
With IVF, the exact embryo age and transfer date are known, so the due date can be calculated more precisely than with last menstrual period (LMP) dating. Standard pregnancy is counted as 280 days from LMP — for IVF we count from conception (which is the egg retrieval / fertilization day).
How does Day 3 vs Day 5 vs Day 6 transfer affect the due date?▾
Pregnancy is counted as 266 days from conception (egg retrieval / fertilization). For a Day 3 transfer, the due date is the transfer date plus 263 days. Day 5 transfer adds 261 days. Day 6 transfer adds 260 days. The calculator applies these adjustments automatically.
Does it matter if the embryo was fresh or frozen (FET)?▾
Mathematically the embryo age determines the gestational age, not whether it was frozen. A Day 5 frozen transfer and a Day 5 fresh transfer give the same due date when transferred on the same date.
What if I had a donor egg or donor embryo?▾
The calculation depends on the embryo age, not the source of the egg. Use the embryo age (Day 3, 5, or 6) as you would for any IVF cycle. Speak to your fertility clinic about specific cases like split donor cycles.
Why does my fertility clinic give a slightly different date?▾
Some clinics adjust by ± 1–2 days based on local conventions or whether they count the day of transfer as Day 0 or Day 1. The differences are small. Trust your clinic's date for medical decisions; this calculator is for personal planning.
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Sources & medical references
- ACOG Committee Opinion #700 — Methods for Estimating the Due Date (covers ART/IVF dating).
- ASRM Practice Committee — Embryo transfer guidelines and dating conventions.
Medical disclaimer:This tool provides estimates only. Trust your fertility clinic's official dating for medical decisions.