If you're going through IVF, one of the most common questions is: "When is my due date after embryo transfer?" This calculator gives you a fast estimate based on your transfer date and embryo age at transfer.
Embryo Transfer Due Date Calculator
This tool provides planning estimates only and is not a substitute for your fertility clinic's instructions.
How the embryo transfer calculator works
Natural pregnancy due dates are usually calculated as 280 days from the first day of the last menstrual period (LMP), or about 266 days from conception. In IVF, we know embryo age and transfer date, so we can estimate these milestones more directly.
- Estimated due date (EDD) = transfer date + (266 − embryo age in days)
- Estimated conception date = transfer date − embryo age in days
- Estimated LMP equivalent = transfer date − (embryo age + 14 days)
Quick reference by embryo stage
Common IVF transfer calculations
- Day 3 transfer: add 263 days to transfer date
- Day 5 transfer: add 261 days to transfer date
- Day 6 transfer: add 260 days to transfer date
These are standard obstetric estimates. Your actual delivery date can vary and is often earlier or later than the estimated date.
What dates this calculator gives you
In addition to your estimated due date, this tool also shows:
- LMP equivalent date (used for gestational age dating)
- Estimated conception/fertilization date
- A typical first beta hCG blood test window
- An approximate first ultrasound timing around 6 weeks gestational age
- Your current gestational age and time remaining (when applicable)
Day 3 vs Day 5 embryos: does it change due date?
Yes, slightly. A day 5 embryo is more developed at transfer than a day 3 embryo, so the number of days added to your transfer date changes. That's why entering the correct embryo age is important for accurate IVF date estimates.
That said, fresh and frozen transfer cycles use the same due-date logic when embryo age is known.
Important notes for IVF patients
- Your clinic's dates always take priority over any online calculator.
- Medication protocols and testing schedules vary by clinic.
- Beta hCG timing may differ based on your history and protocol.
- Only your care team can diagnose pregnancy viability and progress.
FAQ
Is this the same as a regular pregnancy due date calculator?
Not exactly. Traditional calculators estimate ovulation/conception from cycle length. IVF calculators are more precise because transfer date and embryo age are known.
Can this calculator predict delivery day exactly?
No. It predicts an estimated due date, not the exact birth date. Many healthy pregnancies deliver before or after the EDD.
Should I use transfer date or retrieval date?
Use transfer date and embryo age at transfer. The formula handles the rest.