IVF Due Date Calculator
Calculate your expected due date after IVF using embryo transfer date. For Day 3 transfers, add 263 days; for Day 5 (blastocyst) transfers, add 261 days from transfer date.
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⚠️For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
Calculate your expected due date after IVF using embryo transfer date. For Day 3 transfers, add 263 days; for Day 5 (blastocyst) transfers, add 261 days. IVF provides the most precise due date because the transfer date is known exactly. Full term is 37-42 weeks.
Sources: ASRM, SART, ACOG, WHO.
Key Takeaways
- • Day 5 blastocyst: Transfer + 261 days = EDD
- • Day 3 cleavage: Transfer + 263 days = EDD
- • Day 6 expanded: Transfer + 260 days = EDD
- • Fresh and frozen use the same formula
Did You Know?
How Does IVF Due Date Work?
Formula
EDD = Transfer Date + (266 - Embryo Day). 266 days is pregnancy length from conception. Embryo age at transfer is subtracted.
Equivalent LMP
LMP = Transfer - (Embryo Day + 14). Converts to standard obstetric dating for OB providers.
IVF Milestones
Beta hCG ~9-11 days post-transfer, first ultrasound ~6 weeks, RE graduation ~10-12 weeks.
Expert Tips
Transfer Type Comparison
| Embryo Stage | Days to Add | Notes |
|---|---|---|
| Day 3 (Cleavage) | 263 | 6-8 cells |
| Day 5 (Blastocyst) | 261 | ~100 cells, most common |
| Day 6 (Expanded) | 260 | Extended culture |
Frequently Asked Questions
How is IVF due date calculated?
IVF due date = transfer date + days based on embryo age. Day 3 (cleavage) adds 263 days; Day 5 (blastocyst) adds 261 days; Day 6 adds 260 days. This accounts for the embryo's age at transfer to align with standard gestational dating.
Why is Day 5 transfer different from Day 3?
Day 5 blastocysts are 5 days old at transfer, so we add 261 days to reach 40 weeks from LMP. Day 3 embryos are 3 days old, so we add 263 days. The formula is: 266 (days from conception to term) minus embryo age.
Does fresh vs frozen transfer affect due date?
No. The calculation is identical for fresh and frozen embryo transfers. What matters is the embryo's age at transfer (Day 3, 5, or 6), not whether it was fresh or previously frozen.
When do I graduate from my RE to an OB?
Most reproductive endocrinologists transfer care to an OB around 10-12 weeks after confirming a viable pregnancy with good heartbeat and growth. Some clinics may release earlier or later based on protocol.
What is the equivalent LMP date for IVF?
Equivalent LMP = Transfer Date - (Embryo Day + 14). This converts IVF dates to standard LMP-based gestational age for medical records and allows OB providers to use familiar dating.
How accurate is IVF due date?
IVF provides the most accurate due date because the transfer date is known exactly. There is no uncertainty about ovulation timing. Accuracy is typically within 1-2 days.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your reproductive endocrinologist and OB for IVF pregnancy care.