IVF Due Date Calculator
without the guesswork.
IVF FET Due Date Calculator — Date an ART pregnancy from embryo age and transfer date, with equivalent gestational age and clinic-record confirmation. Uses a focused calculator with visible assumptions. Sensitive inputs stay in your browser.
ACOG says an ART pregnancy should be dated from the embryo age and transfer date. The clinic's documented best obstetric estimate remains authoritative.
Context matters.
- An estimated due date is not a prediction of the delivery day and does not set appointment, testing or delivery timing.
- Once the best obstetric estimate is established, later ultrasound findings do not automatically replace it; discuss any discrepancy with the obstetric team.
- Bleeding, severe pain, fainting, breathing difficulty or another urgent pregnancy concern requires clinical care, not date recalculation.
Sources & scope
This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.
What to know before using the result.
Why are 261 or 263 days added to an embryo-transfer date?
ACOG's ART dating method adds 261 days for a day-5 embryo and 263 days for a day-3 embryo so the result matches the conventional 280-day pregnancy scale.
Does a frozen embryo transfer use a different due-date method?
No. The transfer date and embryo age determine the ART-based estimate whether the transfer was fresh or frozen; the fertility clinic's documented date should control.
Can a later ultrasound automatically replace the clinic due date?
Not automatically. ACOG says pregnancies conceived with assisted reproductive technology should use ART-derived gestational age, while the treating clinician decides whether any redating is appropriate.