IVF/FET Due Date Calculator

Updated Aug 2025 · Written by

Enter your embryo transfer date and embryo day (3/5/6) to get your estimated due date instantly.

IVF/FET Due Date Calculator

EDD is always 40 weeks; multiples often deliver earlier. We’ll show a typical window if selected.
EDD: —
Gestational age today: —
Methodology & sources

IVF/FET dating: EDD = transfer date + 263 days (day-3), 261 days (day-5), or 260 days (day-6). These offsets reflect standard obstetric dating where gestational age is counted from ~2 weeks before fertilization.

Multiples timing: Typical planning windows for uncomplicated pregnancies are di/di twins ≈ ~38w; mono/di ≈ ~36–37w; mono/mono ≈ ~32–34w; triplets ≈ ~35–36w. Individual care varies.

See How it works and Data sources for details and citations.

Frequently asked questions

How is IVF/FET due date calculated?
From transfer date: add ~263 days for day-3, 261 days for day-5, or 260 days for day-6 embryos.
Does frozen vs. fresh transfer change EDD?
No—the EDD uses the transfer date and embryo day, not whether the transfer was fresh or frozen.
What if my early ultrasound disagrees with this EDD?
Clinics often confirm or adjust dating by early ultrasound. Follow your clinician’s guidance if they assign a different EDD.
What if I’m expecting twins or triplets?
EDD is still 40 weeks, but typical delivery is earlier for multiples. Your care team will individualize timing.

Educational only — not medical advice.