IVF Due Date Calculator — Day 3 & 5
Calculate your IVF due date from embryo transfer date. Supports Day 3 and Day 5 (blastocyst) transfers. Based on ACOG Committee Opinion 700. Free.
CalcVita. (2026). IVF Due Date Calculator — Day 3 & 5. CalcVita. Retrieved October 16, 2026, from https://calcvita.com/en/calculators/ivf-due-date
Suggested article
IVF Due Date: How the Transfer Date Determines Your EDD
IVF pregnancies have a precisely known embryo age, making due date calculation more accurate than LMP-based methods. Learn the day-3 vs day-5 transfer formulas and what an 'equivalent LMP' really means.
Read the full article →How does the IVF due date calculator work?
Enter your embryo transfer date and select the age of the embryo at transfer (Day 3 or Day 5 are the most common). The calculator applies the ACOG formula to compute your estimated due date (EDD).
The formula
- Day 5 (blastocyst): EDD = transfer date + 261 days (266 − 5)
- Day 3 (cleavage): EDD = transfer date + 263 days (266 − 3)
Gestational age at transfer
In IVF dating, gestational age at the time of transfer is calculated as 14 days (pre-ovulatory phase) plus the embryo age. A Day 5 transfer = 2 weeks 5 days gestational age; a Day 3 transfer = 2 weeks 3 days.
Accuracy and limitations
IVF due dates are generally more precise than natural pregnancy estimates because the exact embryo age is known; ACOG recommends dating IVF pregnancies from embryo age and transfer date. An early ultrasound is still performed to confirm the pregnancy and the number of embryos. (ACOG, 2017)
Scientific sources
- American College of Obstetricians and Gynecologists (2017). Methods for Estimating the Due Date. Committee Opinion No. 700. Obstet Gynecol. 129(5):e150–e154. PMID 28426621. acog.org
- How is the IVF due date calculated?
- The IVF estimated due date (EDD) is calculated as: EDD = embryo transfer date + (266 − embryo age at transfer). For a Day 5 blastocyst transfer, EDD = transfer date + 261 days; for a Day 3 embryo, EDD = transfer date + 263 days. This method is based on ACOG Committee Opinion No. 700 (2017) — Methods for Estimating the Due Date, adapted for IVF dating.
- Why is the IVF due date different from a natural pregnancy?
- In a natural pregnancy, the due date is calculated 280 days from the last menstrual period (LMP). In IVF, the exact age of the embryo is known, so the due date is calculated backward from the 266-day conception-to-delivery interval. Because the embryo has already developed for 3–5 days outside the body before transfer, fewer days are added to the transfer date. (ACOG Committee Opinion No. 700, 2017 — Methods for Estimating the Due Date)
- What is the difference between a Day 3 and Day 5 embryo transfer?
- A Day 3 embryo (cleavage stage) has spent 3 days developing in the laboratory; a Day 5 embryo has reached the blastocyst stage. For dating, what matters is that difference in age: the due date falls 263 days after a Day 3 transfer and 261 days after a Day 5 transfer (ACOG Committee Opinion No. 700, 2017).
- How accurate is an IVF due date estimate?
- IVF due dates are generally more precise than those of natural pregnancies, because the exact age of the embryo is known. For that reason ACOG recommends assigning the due date of an IVF pregnancy from the embryo age and the transfer date. Even so, it is an estimate: actual birth dates vary with each pregnancy, and only a small share of babies are born on that exact day. (ACOG Committee Opinion No. 700, 2017)
- What is gestational age in an IVF pregnancy?
- In IVF, gestational age is calculated as if conception occurred 14 days after the LMP-equivalent date (the day of egg retrieval). At a Day 5 embryo transfer, gestational age is 2 weeks and 5 days (19 days total); at a Day 3 transfer, gestational age is 2 weeks and 3 days (17 days total). This follows ACOG (2017) IVF dating conventions. (ACOG Committee Opinion No. 700, 2017 — Methods for Estimating the Due Date)
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