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 & ASRM guidelines. Free.
CalcVita. (2026). IVF Due Date Calculator — Day 3 & 5. CalcVita. Retrieved June 3, 2026, from https://calcvita.com/en/calculators/ivf-due-date
Suggested article
IVF Due Date Calculator: How 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 ASRM/ACOG-based formulas 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. First-trimester ultrasound (6–10 weeks) is still recommended to confirm EDD and check for twins or other findings. (ACOG, 2017)
Scientific sources
- American College of Obstetricians and Gynecologists (2017). Methods for Estimating the Due Date. Practice Bulletin No. 700. Obstet Gynecol. 129(5):e150–e154. acog.org
- Practice Committee of the American Society for Reproductive Medicine (2016). Guidance on the limits to the number of embryos to transfer: a committee opinion. Fertil Steril. 107(4):901–903. doi:10.1016/j.fertnstert.2017.02.107
- Imudia AN, et al. (2012). Perinatal outcomes of singleton pregnancies achieved by in vitro fertilization: a comparative analysis. J Matern Fetal Neonatal Med. 25(6):672–676. PMID: 21851298. doi:10.3109/14767058.2011.596744
- 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 Practice Bulletin 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 Practice Bulletin 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 undergone 3 days of development in the laboratory. A Day 5 embryo (blastocyst stage) has developed for 5 days and has reached the blastocyst stage, which more closely resembles the natural implantation window. Day 5 blastocyst transfers have become the most common type in modern IVF clinics due to higher implantation rates per transfer. (American Society for Reproductive Medicine, 2016 — Guidance on limits to embryos transferred, Fertil Steril, DOI: 10.1016/j.fertnstert.2017.02.107)
- How accurate is an IVF due date estimate?
- IVF due dates are generally considered more accurate than natural pregnancy due dates, because the exact age of the embryo is known. However, actual birth dates vary due to individual gestational length differences. Only about 5% of births occur on the exact due date. First-trimester ultrasound remains the gold standard for confirming gestational age. (ACOG Practice Bulletin 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 or the day before trigger shot). 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 Practice Bulletin No. 700, 2017 — Methods for Estimating the Due Date)
More calculators
Keep exploring helpful tools
Due date by ultrasound
Calculate due date from an ultrasound: gestational age or crown-rump length.
Due date calculator
Estimate due date from last menstrual period.
Conception date
Estimate the likely conception date from your due date or last period.
Gestational age
See gestational weeks and current trimester.