ET Due Date Calculator After Transfer
Calculate IVF due date after day 3 or 5 transfer; fresh and frozen use the same formula.
Quick Answer
The ET calculator estimates due date from embryo transfer and embryo age (day 3 or 5). Fresh and frozen transfers date the same way.
Try Related Tools
Use our source-informed calculators to get helpful insights.
What a Post-Transfer ET Calculator Does
After a positive beta, the usual question is: what is my due date?
IVF dating is often more precise because the clinic knows embryo age on transfer day. An ET calculator uses those data — not your last period.
Use IVF Due Date Calculator with retrieval, day 3, or day 5 blastocyst transfer.
Why LMP Does Not Apply in IVF
- Natural cycles are often medicated or suppressed
- Fertilization occurs in the laboratory
- Transfer date and embryo age are documented
Day 3 vs Day 5 Transfer
| Transfer | Age on transfer day | Typical calculation |
|---|---|---|
| Day 3 embryo | 3 days | Transfer date + 263 days |
| Day 5 blastocyst | 5 days | Transfer date + 261 days |
Example: Transfer March 10, 2026 — Day 3 ≈ Nov 28; Day 5 ≈ Nov 26.
Fresh vs Frozen (FET)
Same formula. A frozen day-5 blastocyst transferred today dates like a fresh day-5 transfer.
Common Mistakes
- Wrong transfer type in calculator
- Confusing retrieval with transfer
- Using medicated prep LMP
When to Contact Your Clinic
- Result very different from clinic portal
- Unclear day 3 vs day 5
- Heavy bleeding or severe pain during wait
Related
FAQ
Q: Is FET less accurate? A: No. Embryo age on transfer day counts.
Q: Does it replace ultrasound? A: No. It explains dating logic; follow clinical protocol.
Educational content. Confirm your due date with your fertility clinic.