IVF Due Date Calculator
Calculate your due date and gestational age from your IVF embryo transfer date.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Calculating your due date after IVF is slightly different from natural conception because we know the exact age of the embryo at transfer. Here is how to use this calculator:
- Enter your transfer date. This is the calendar date when the embryo was transferred into the uterus.
- Select the embryo age. Day 5 blastocysts are the most common transfer type in modern IVF. Day 3 embryos are transferred less frequently but are still used in some protocols.
- Read your results. You will see your estimated due date, the equivalent LMP date (used by ultrasound and OB systems), current gestational age, trimester, and days remaining.
Your IVF clinic may give you a slightly different due date based on their specific protocol. Always use the date confirmed by your first trimester ultrasound as the reference. Use Share to send this calculation to family members or your OB.
About IVF Due Date Calculation
Standard due date calculation uses 280 days (40 weeks) from the last menstrual period (LMP). For IVF, we work backward from the embryo age. A Day 5 blastocyst transfer adds 261 days to reach 40 weeks (280 minus the 19 days from LMP to Day 5 transfer). A Day 3 embryo adds 263 days (280 minus 17). The LMP equivalent shown in the results is the date your OB system would use as the reference start point for gestational age, even though you did not have a traditional LMP in that cycle.
First trimester ultrasound (typically at 8-10 weeks) may adjust the due date by a few days if the measured fetal size differs from expected dates. This is normal and your provider's adjusted date should be used going forward.
Frequently Asked Questions
How is an IVF due date calculated?
For a Day 5 blastocyst transfer, add 261 days to the transfer date. For a Day 3 embryo, add 263 days. These numbers come from subtracting the embryo's age from 280 (the standard length of a full-term pregnancy). A Day 5 embryo is already 5 days old at transfer, so it needs 261 more days to reach 40 weeks. The formula ensures accuracy regardless of whether you had a natural menstrual cycle.
Why does my IVF due date differ from a regular due date calculator?
Standard due date calculators use the first day of your last menstrual period. In IVF cycles, ovulation and fertilization are precisely controlled, so we skip the LMP-based estimate and calculate directly from the transfer date and embryo age. Using a regular calculator with your LMP from the retrieval cycle could give an incorrect result. This IVF calculator is specifically designed for transfer-based calculations.
Is a Day 3 or Day 5 transfer better?
Statistically, Day 5 blastocyst transfers have higher success rates because culturing to Day 5 allows the lab to select the most viable embryos. However, not all embryos survive to Day 5 in culture, and for some patients Day 3 transfer is recommended to maximize the embryo's chance in its natural environment. Your reproductive endocrinologist will recommend the transfer day based on your embryo quality, age, diagnosis, and cycle history.
When will my IVF due date be confirmed by ultrasound?
Your first confirmation ultrasound, called a viability scan or heartbeat scan, is typically scheduled 4-6 weeks after transfer (around 6-8 weeks gestational age) to confirm the pregnancy and heartbeat. A dating ultrasound at 8-10 weeks measures the embryo's crown-rump length and may slightly adjust your due date. If the measured date differs from the calculated date by more than 5-7 days, your provider will typically use the ultrasound date going forward.