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IVF Due Date Calculator
Specialized calculation for IVF pregnancies tailored to transfer type.
Medically ReviewedEvidence-BasedUpdated Feb 28, 2026
How this calculator works
This calculator uses peer-reviewed algorithms derived from clinical research on menstrual cycle physiology. It applies standard luteal phase calculations and statistical cycle analysis models to produce estimates based on your individual input data.
All calculations are performed locally in your browser. No personal data is transmitted to our servers.
Clinical Disclaimer
This tool is for educational purposes only and does not constitute medical advice. The calculations are based on statistical averages and clinical guidelines, but may not be accurate for individuals with irregular cycles or underlying health conditions. Always consult with a healthcare provider for medical advice.
Dr. Sarah Jenkins
Board Certified OB/GYN
Dedicated to advancing women's health through evidence-based medicine and patient education.
Reviewed by Dr. Emily Chen
Chief Medical Officer
Calculating Your Due Date After IVF
Unlike natural conception, where the due date is calculated from the first day of the last menstrual period, IVF due dates are calculated with precision based on the date of egg retrieval or embryo transfer. This provides a highly accurate estimated due date (EDD).
Day 3 vs. Day 5 Embryo Transfers
The calculation depends on the age of the embryo at transfer:
- Day 3 Transfer: The due date is calculated by adding 263 days to the transfer date.
- Day 5 Transfer (Blastocyst): The due date is calculated by adding 261 days to the transfer date.
How IVF Dating Differs from Natural Conception
In natural conception, doctors assume ovulation occurred on day 14 of a 28-day cycle, which can be inaccurate. With IVF, the exact date of fertilization (egg retrieval) or transfer is known, making the gestational age calculation exact. A full-term pregnancy is considered 40 weeks (280 days) from the "virtual" last menstrual period.
Preparing for a Healthy Pregnancy
After a successful IVF transfer, you will likely continue hormonal support (like progesterone) as directed by your clinic. Early ultrasounds will monitor the embryo's development. Maintain a healthy lifestyle, take prenatal vitamins, and attend all scheduled appointments with your reproductive endocrinologist and OB/GYN.
Sources & Citations
Last updated: Feb 28, 2026