IVF Due Date Calculator (5-Day Embryo Transfer)
Enter your embryo transfer date below to estimate your due date and key pregnancy milestones.
How this IVF due date calculator works
If you had a 5-day embryo transfer, your due date is usually calculated by adding 261 days to your transfer date. This method is widely used because IVF gives a known embryo age, making dating more precise than many spontaneous pregnancies.
In a natural pregnancy, doctors often count from the first day of the last menstrual period (LMP), which assumes ovulation around day 14. With IVF, we can estimate an LMP-equivalent date directly from your transfer timeline, so due date estimates are typically more accurate.
Quick formula for a 5-day transfer
- Estimated Due Date (EDD) = transfer date + 261 days
- Estimated conception/fertilization date = transfer date - 5 days
- LMP-equivalent date = transfer date - 19 days
This page uses those exact calculations in the calculator above.
5-day transfer pregnancy timeline (typical)
- Transfer day: Gestational age is approximately 2 weeks + 5 days.
- Beta hCG blood test: Commonly around 9 to 12 days after transfer (clinic dependent).
- First ultrasound: Often around 6 to 7 weeks gestational age.
- End of first trimester: About 13 weeks + 6 days gestational age.
- Anatomy scan: Usually around 18 to 22 weeks.
- Estimated due date: 40 weeks gestational age.
Why IVF due date estimates are often more precise
For many people, cycle timing can vary month to month. In IVF, your care team knows exactly when the embryo reached day 5 and when it was transferred. That means fewer assumptions compared with LMP-only dating.
Even so, your provider may refine dating after early ultrasound measurements. If your clinic gives you a specific due date, treat that as your official date.
Frozen embryo transfer (FET) and fresh transfer: does it change the math?
For a day-5 embryo, the basic due-date math is the same whether transfer was frozen or fresh: add 261 days to transfer day. What can differ is medication protocol, monitoring schedule, and follow-up timing.
Frequently asked questions
Is this a medical diagnosis?
No. It is an estimate tool. Your fertility clinic or OB provider should always confirm your official pregnancy dating.
Can implantation timing change the due date?
Minor variation in implantation timing can happen, but IVF-based dating is still usually highly reliable. Clinical ultrasound can fine-tune timing if needed.
What if I transferred a day-3 embryo?
This calculator is specifically for day-5 transfer. Day-3 transfer uses a different day offset. Use a dedicated day-3 IVF due date calculator for best accuracy.
Can twins change my due date?
Estimated due date calculation stays the same, but twin pregnancies often deliver earlier than 40 weeks. Your doctor will provide a personalized care plan.
Important reminder
Online tools are useful for planning, but they do not replace personalized medical care. If you have bleeding, severe pain, sudden swelling, severe headache, vision changes, or any concerning symptoms, contact your clinic right away or seek urgent care.