Estimate your IVF or FET due date. This free IVF due date calculator works from your embryo transfer date and embryo age (day 3, 5 or 6) or your egg retrieval date, and shows how far along you are.
A full-term pregnancy is about 266 days from conception. With IVF the embryo’s age is known, so the due date is the transfer date plus (266 minus the embryo’s age in days), or the egg-retrieval date plus 266.
Estimates only and not medical advice. Your fertility clinic and dating ultrasound provide the definitive due date for your pregnancy.
How the IVF Due Date Calculator Works
This calculator estimates a due date for an IVF or frozen-embryo (FET) pregnancy from either your embryo transfer date and embryo age, or your egg retrieval date. Because the embryo’s exact age is known in an IVF cycle, this dating method can be more precise than a standard last-menstrual-period estimate.
Formula: A full-term pregnancy runs about 266 days from conception. If you enter an embryo transfer date, the due date equals the transfer date plus (266 minus the embryo’s age in days at transfer) — so day 5 embryos add 261 days, day 3 embryos add 263 days, and day 6 embryos add 260 days. If you enter an egg retrieval date instead, the due date equals the retrieval date plus 266 days. The tool also back-calculates an “equivalent LMP date” as the due date minus 280 days (equal to transfer date minus 14 plus embryo age), then works out how far along you are today by counting the days between that equivalent LMP and today, dividing by 7 for weeks and days, and labeling under 98 days as the first trimester, 98–195 days as the second, and 196 days or more as the third.
- Basis — whether you’re dating from an embryo transfer or an egg retrieval
- Embryo transfer date — the date the embryo was placed in the uterus
- Embryo age at transfer — day 3, day 5, or day 6, matching your clinic’s embryo grading
- Egg retrieval date — the date eggs were collected, used instead of a transfer date when selected
Example Scenarios
| Basis | Date Entered | Embryo Age | Estimated Due Date |
|---|---|---|---|
| Embryo transfer | Jan 1, 2026 | Day 5 | Sep 19, 2026 |
| Embryo transfer | Mar 10, 2026 | Day 3 | Nov 28, 2026 |
| Egg retrieval | Jun 1, 2026 | n/a | Feb 22, 2027 |
| Embryo transfer | Nov 15, 2026 | Day 6 | Aug 2, 2027 |
| Egg retrieval | Feb 5, 2026 | n/a | Oct 29, 2026 |
Getting the Right Inputs for the IVF Due Date Calculator
An IVF due date calculator can be more precise than a period-based estimate, because the date of fertilization is known. Even so, the result is only as good as the details you enter.
- Embryo age means its age at transfer. A day 5 blastocyst is five days past fertilization however long it was frozen, so for a frozen transfer enter the transfer date and embryo age, not the freezing date.
- Choose day 6 if that is what you had; rounding to day 5 shifts the date by a day.
- Take the transfer date from your clinic paperwork before entering it into the IVF due date calculator.
If an early scan gives a different date, your team’s date is the one to use, and the IVF due date calculator figure becomes a planning estimate.
Few babies arrive on the due date itself, and twins often come earlier, so ask your team what to expect rather than relying only on the IVF due date calculator. The in vitro fertilisation article on Wikipedia explains the embryo stages an IVF due date calculator accounts for.
IVF Due Date Calculator FAQ
How is an IVF due date different from a regular LMP-based due date?
A standard due date estimates conception from the first day of your last period, which is uncertain if cycles vary. An IVF due date is anchored to a known embryo age or retrieval date, so it can be more precise — but it is still an estimate to confirm with your clinic and dating scan.Why do I need to enter the embryo’s age (day 3, 5, or 6) instead of just the transfer date?
Embryo age at transfer tells the calculator how many days of development had already happened before transfer, so it can work out the equivalent conception date. A day 5 blastocyst and a day 3 embryo transferred on the same date imply different due dates.Can I use this for a natural or medicated frozen embryo transfer (FET)?
Yes — the calculation only needs the transfer date and embryo age, which applies the same way to fresh or frozen transfers, and to natural or medicated FET cycles. Your clinic can confirm which age classification applies to your specific embryo.What is the “equivalent LMP date” and why does it matter?
It’s the hypothetical last-menstrual-period date that would produce the same due date under standard dating conventions. It lets the calculator show a familiar “weeks and days” gestational age and trimester, even though your pregnancy wasn’t dated from an actual last period.How accurate is an IVF-based due date compared to a dating ultrasound?
Because the embryo’s age is precisely known, IVF dating is generally considered very reliable, but growth still varies between pregnancies. Your fertility clinic and any dating ultrasound remain the definitive source for your due date, not this calculator.What if I only know my egg retrieval date, not my transfer date?
Switch the calculator to “Egg retrieval” mode and enter that date instead — the due date is simply the retrieval date plus 266 days, since eggs are considered to be at the point of fertilization around retrieval.Related Calculators
If your clinic dated you from a natural cycle instead, the standard LMP-based due date calculator offers a point of comparison, while the pregnancy week calculator can help you track weekly milestones once your due date is set. Anyone piecing together an exact conception window may also find the conception date calculator useful for cross-checking timelines.