Reverse IVF Due Date Calculation
To back-calculate your embryo transfer date from a known due date (EDD), subtract the embryo age from the standard 280-day pregnancy length.
- Day 3 embryo: EDD − 263 days = transfer date
- Day 5 embryo (blastocyst): EDD − 261 days = transfer date
- Day 6 blastocyst: EDD − 260 days
- Day 7 blastocyst: EDD − 259 days
This provides a precise estimate because IVF timing is known. Confirm with your clinic records.