Calculate your IVF pregnancy due date from embryo transfer. Supports Day 3, Day 5, and FET transfers with trimester milestones and gestational age tracking.
This calculator provides estimates only and is not medical advice. Consult your healthcare provider for accurate pregnancy dating. An ultrasound is the most reliable method to confirm gestational age and due date.
Enter the date your embryo was transferred. Select the embryo stage (Day 3, 5, or 6) for accurate dating.
You might also find these calculators useful
Calculating your IVF due date is more precise than natural conception dating because the exact fertilization date is known. For a Day 5 blastocyst transfer, add 261 days to your transfer date. For a Day 3 cleavage-stage embryo, add 263 days. This IVF due date calculator supports Day 3, Day 5, and Day 6 embryo transfers, egg retrieval date calculations, and LMP-based dating. Simply enter your transfer date and embryo type to get your estimated due date, current gestational age, trimester progress, and a complete pregnancy milestone timeline.
An IVF due date is the estimated delivery date for pregnancies conceived through in vitro fertilization. Unlike natural conception where the fertilization date is uncertain, IVF provides an exact date of embryo creation and transfer, making the due date calculation significantly more accurate. The standard pregnancy duration is 266 days (38 weeks) from conception, or 280 days (40 weeks) from the last menstrual period. For IVF pregnancies, the calculation adjusts based on the embryo's age at the time of transfer.
IVF Due Date Formula
EDD = Transfer Date + (266 − Embryo Age in Days)IVF due dates are more accurate than dates based on your last menstrual period because the exact day of fertilization and embryo transfer is known, removing the guesswork from pregnancy dating.
Know exactly how many weeks and days pregnant you are at any point. This precision helps you and your healthcare provider monitor fetal development against expected milestones.
Knowing your accurate due date helps schedule critical prenatal tests including the NT scan, anatomy scan, glucose screening, and growth ultrasounds at the correct gestational age.
Whether you had a Day 3 cleavage-stage transfer, Day 5 blastocyst transfer, or Day 6 extended culture transfer, the calculator adjusts the formula for each embryo stage.
The due date calculation is identical for fresh IVF cycles and frozen embryo transfers (FET). The embryo's age at transfer determines the adjustment, regardless of whether the embryo was cryopreserved.
Get a full pregnancy milestone calendar showing when to expect the first heartbeat, anatomy scan, viability date, and other key moments throughout your IVF pregnancy.
Calculate your due date immediately after a fresh Day 3 or Day 5 embryo transfer during an IVF cycle. The calculator accounts for the embryo's age to provide an accurate estimated delivery date.
FET due dates use the same calculation as fresh transfers. Enter your FET date and embryo stage to get your due date, whether this is your first transfer or a subsequent cycle.
For donor egg IVF or donated embryo transfers, the due date calculation works identically. Use the transfer date and embryo stage regardless of the egg or embryo source.
Healthcare providers need accurate gestational age for scheduling tests and monitoring fetal growth. Use this calculator to confirm your pregnancy dating between appointments.
An accurate IVF due date helps plan work schedules, maternity or paternity leave, and childcare arrangements with greater confidence than estimates based on uncertain conception dates.
The IVF due date is calculated by adding the remaining days of pregnancy to your transfer date. For a Day 5 transfer: Due Date = Transfer Date + 261 days. For Day 3: Transfer Date + 263 days. For Day 6: Transfer Date + 260 days. The formula is: Transfer Date + (266 - embryo age in days).
Yes, IVF due dates are generally more accurate because the exact date of fertilization and embryo transfer is known. With natural conception, the fertilization date is estimated from the last menstrual period, which can be off by days or weeks. However, only about 5% of babies arrive on their exact due date regardless of conception method.
On the day of a Day 5 embryo transfer, you are considered 2 weeks and 5 days (2w5d) pregnant in gestational age. This is because gestational age counts from the equivalent LMP date, which is 14 days before conception. Since a Day 5 embryo is 5 days past fertilization, the gestational age is 14 + 5 = 19 days, or 2 weeks and 5 days.
No, the due date calculation is the same whether you had a fresh or frozen embryo transfer. The embryo's developmental stage (Day 3, Day 5, or Day 6) at the time of transfer determines the calculation, not whether the embryo was previously cryopreserved. Freezing and thawing does not change the embryo's biological age.
Single IVF babies arrive at similar times to naturally conceived babies — most within 2 weeks of the due date. However, IVF pregnancies with multiple embryos (twins or triplets) tend to deliver earlier. Some studies suggest a slightly higher rate of preterm birth in IVF pregnancies, but the difference is small for singleton pregnancies.
A Day 3 transfer uses a cleavage-stage embryo (6-8 cells), while a Day 5 transfer uses a blastocyst (100+ cells). Day 5 transfers are more common because blastocysts have proven viability through longer culture. Day 6 transfers involve blastocysts that needed an extra day to develop. The transfer day affects due date calculation because each embryo has a different biological age at transfer.
Yes. Since eggs are fertilized on the day of retrieval (or within hours), you can add 266 days (38 weeks) to the egg retrieval date to estimate your due date. This method works for fresh transfers and gives the same result as calculating from the transfer date when the embryo age is accounted for.
IVF due dates are among the most accurate pregnancy date estimates because they're based on a known fertilization date. However, only about 4-5% of babies are born on their exact due date. Most babies arrive within a 2-week window around the estimated date. Your provider may adjust the due date based on early ultrasound measurements if there is a significant discrepancy.