Embryo transfer date
Use the actual transfer date. A scheduled future date produces a planning estimate only. Do not substitute a retrieval or fertilization date.
Pregnancy Metrics
IVF Due Date Calculator
Estimate an IVF or frozen embryo transfer (FET) due date from the clinic’s transfer date and Day-3 or Day-5 embryo-age record. See the EDD, pregnancy weeks, and calendar rule.
A browser-based pregnancy tracker with transparent pregnancy and preconception reference tools for educational use.
Check the transfer record before calculating
Use the actual or scheduled transfer date and the clinic-confirmed total embryo developmental age for the transfer being dated.
Embryo developmental age for dating
Choose Day 3 or Day 5 only when the clinic confirms that total developmental age for pregnancy dating. If it is unclear or another day, do not guess or add culture days yourself.
Fresh or frozen transfer
Fresh and frozen transfers use the same due-date principle once the correct transfer date and clinic-confirmed Day-3 or Day-5 developmental age are known.
For detailed fresh/frozen record distinctions and embryo-developmental-age examples, read How IVF due dates are calculated.
How to use this IVF due date calculator
- Find the actual embryo transfer date in your clinic record.
- Choose the Day-3 or Day-5 total embryo developmental age your clinic confirms for pregnancy dating.
- Read the estimated due date first; pregnancy weeks are secondary.
Do not use an ordinary last-period date, an intercourse date, or the original retrieval date for a frozen embryo transfer.
Day-3 and Day-5 embryo transfers
- Day-5 blastocyst: transfer date + 261 days; pregnancy-calendar age on transfer day is 2w5d.
- Day-3 embryo: transfer date + 263 days; pregnancy-calendar age on transfer day is 2w3d.
The result shows the entered transfer record, the applicable offset, the implied pregnancy-calendar start, and the estimated due date. The implied start is a derived counting reference, not a reported last menstrual period.
The two-day offset difference follows the documented embryo age. It is not a comparison of embryo quality, health, implantation potential, or treatment success.
For the full 280-day derivation and worked Day-3/Day-5 examples, read How IVF due dates are calculated.
Supported transfer records
Fresh and frozen transfers use the actual transfer date and the clinic-confirmed total Day-3 or Day-5 developmental age. The tool does not need a fresh-versus-frozen switch because those two record fields determine the supported offset.
If the embryo age is unknown, is another day, or would require you to reconstruct culture time, do not choose the nearest option. Use the clinic’s established due date or ask which developmental age the clinic used for dating.
Why your clinic’s due date should guide care
This page uses a transparent calendar formula, but your clinic record includes your treatment and pregnancy context. Once your care team has established a due date, use that date for pregnancy care. This page does not decide redating or average several due dates.
If you already have a recorded due date and want pregnancy weeks or a coherent dated timeline, use the Pregnancy Timeline Calculator.
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What this calculator cannot tell you
This tool is not an IVF stimulation timeline, implantation calculator, pregnancy tracker, or twins predictor. It cannot show whether implantation occurred, predict IVF success, pregnancy-test timing, viability, fetal growth, wellbeing, ectopic pregnancy, number of fetuses, medication timing, treatment changes, symptoms, or the exact delivery day.
References
Formula definitions, date-only arithmetic, supported embryo days, and pregnancy-week boundaries are documented in the Methodology.
- ACOG — Methods for Estimating the Due Date
Reaffirmed in 2025. Directly supports assigning an ART pregnancy’s EDD from the embryo age and transfer date, including transfer date + 261 days for a Day-5 embryo and transfer date + 263 days for a Day-3 embryo. It also supports documenting the established gestational age and EDD in the pregnancy record.
- ACOG — How Your Fetus Grows During Pregnancy
Supports counting gestational age on the conventional pregnancy calendar, reporting it in completed weeks and additional days, and the trimester boundaries displayed by this calculator.
- ACOG — Definition of Term Pregnancy
Reaffirmed in 2025. Supports the early-term, full-term, late-term, and postterm gestational-age categories that may appear in pregnancy-week results.
- CDC — Assisted Reproductive Technology Glossary
Defines egg retrieval, embryo transfer, fresh embryo cycles, frozen embryo cycles, IVF, and ART gestational age, supporting the distinction between retrieval and transfer records and between fresh and frozen transfer cycles.
- NICHD — Assisted Reproductive Technology
Explains that IVF embryos may be placed into the uterus 1 to 6 days after retrieval and that embryos may be frozen, thawed, and transferred later, supporting the distinction between retrieval and the actual transfer event.
- ASRM — The International Glossary on Infertility and Fertility Care, 2025
Defines ART gestational age by adding 14 days to completed time since insemination or ICSI and states that, for frozen-thawed embryo transfer, the estimated insemination or ICSI date reflects the combined embryo-culture days before cryopreservation and after thawing or warming.
These sources support the specific statements identified above. They do not review, certify, sponsor, or endorse Pregnancy Metrics.
Frequently asked questions
- How is an IVF due date calculated?
- Use the embryo transfer date and the Day-3 or Day-5 total embryo developmental age your clinic confirms for pregnancy dating. This calculator adds 261 days for a Day-5 blastocyst transfer and 263 days for a Day-3 embryo transfer.
- Does this calculator work for a frozen embryo transfer?
- Yes, when the clinic confirms that the total embryo developmental age used for pregnancy dating is Day 3 or Day 5. For a frozen embryo transfer (FET), that total reflects development before cryopreservation plus any additional development after warming. Use the actual transfer date, and do not add laboratory culture days yourself.
- Can I use my egg retrieval date?
- No. Egg retrieval, fertilization, and embryo transfer are different events. A retrieval date cannot replace the transfer date for a frozen embryo transfer.
- What if I do not know the embryo day or my record lists another embryo age?
- Do not guess. If the record lists Day 6, another embryo age, an unclear embryo age, or only the day at freezing without confirming development after warming, do not choose the nearest option or add culture days yourself. Use the due date recorded by your clinic, or ask which embryo developmental age the clinic used for pregnancy dating. This calculator currently supports clinic-confirmed Day-3 and Day-5 transfers only.
- Can this calculator predict implantation, IVF success, or the exact birth date?
- No. It provides an educational calendar estimate only. It cannot predict implantation, pregnancy success, pregnancy outcome, or the exact day of birth.