IVF Due Date Calculator
HealthEstimate days remaining until your due date from an IVF embryo transfer, based on days since transfer and whether it was a day 3 or day 5 (blastocyst) transfer.
Estimated Days Until Due Date
247
Estimated Current Gestational Weeks
4
What is a IVF Due Date?
The IVF Due Date Calculator estimates days remaining until your due date and your current estimated gestational age, based on days since embryo transfer and whether it was a day 3 or day 5 (blastocyst) transfer.
For related pregnancy dating tools, see the Gestational Age Calculator.
How to use this IVF Due Date calculator
- Enter the days since your embryo transfer.
- Select whether it was a Day 3 or Day 5 (Blastocyst) transfer.
- Read the Estimated Days Until Due Date and Estimated Current Gestational Weeks instantly.
- Confirm your official due date with your fertility clinic, especially after any subsequent ultrasound dating.
Formula & Methodology
Day 5 Transfer: Due Date = Transfer Date + 261 days Day 3 Transfer: Due Date = Transfer Date + 263 days Worked example — 14 days since a Day 5 transfer: Days Until Due Date = 261 − 14 = 247 days Estimated gestational age = (19 + 14) ÷ 7 = 4 weeks
Frequently Asked Questions
With IVF, the exact date of fertilization (and often the exact embryo age at transfer) is known precisely, which makes due date calculation from transfer date generally more precise than estimating from a last menstrual period in a natural conception.
A day 3 transfer occurs when the embryo has developed for 3 days after fertilization (cleavage stage), while a day 5 transfer (blastocyst transfer) allows 5 days of development before transfer — the calculator adjusts its formula based on which stage was used.
For a day 5 transfer, due date is commonly estimated as 261 days after transfer; for a day 3 transfer, it's commonly estimated as 263 days after transfer — both reflecting a standard 266-day gestation from the actual conception/fertilization date.
Since a day 5 embryo is 2 days more developed than a day 3 embryo at the moment of transfer, fewer days are needed after a day 5 transfer to reach the same total gestational milestone, hence the shorter 261-day figure compared to 263 days for day 3.
Fertility clinics typically provide your official due date directly based on your specific protocol and any subsequent ultrasound dating; this calculator offers a general reference estimate using standard day-count conventions.
The calculator adds your days since transfer to a reference starting gestational age at the moment of transfer (19 days for day 5, 17 days for day 3, reflecting standard LMP-based dating conventions), then converts the total to weeks.
Yes — the same day 3 or day 5 reference calculation applies whether the transfer was fresh or frozen, since what matters for this calculation is the embryo's developmental age at transfer, not whether it was previously frozen.
The [Gestational Age Calculator](/gestational-age-calculator/) calculates gestational age from days since LMP directly, while this calculator is specifically tailored to IVF's more precise transfer-date-based timeline.
Your fertility clinic's due date, which accounts for your specific protocol details and any subsequent ultrasound confirmation, should always take priority over this general reference calculator.
This information should be in your fertility clinic's records or provided in your transfer paperwork — checking with your clinic is the most reliable way to confirm this detail for an accurate calculation.
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