IVF Due Date Calculator
Calculate your due date with precision for IVF pregnancies. Supports Day 3 Transfer, Day 5 Transfer, Egg Retrieval, and IUI dates.
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About
In Vitro Fertilization (IVF) pregnancies require a different calculation method than natural conception. Using the 'Last Menstrual Period' (LMP) is notoriously inaccurate for IVF because medication often manipulates the ovulation cycle. To get a precise Estimated Due Date (EDD), you must calculate based on the exact biological age of the embryo at the moment of transfer.
This tool adjusts the timeline based on your specific procedure—whether it was a Day 3 embryo transfer, a Day 5 blastocyst transfer (FET), or an Intrauterine Insemination (IUI). This precision reduces anxiety and ensures your medical milestones align with the baby's actual development.
Formulas
The formula standardizes the pregnancy to a theoretical 280-day cycle (40 weeks) by adding the remaining gestation time to the transfer date.
Example: For a Day 5 Transfer, we add (266 - 5) = 261 days.
Reference Data
| Procedure | Calculation Logic | Avg Days to Birth |
|---|---|---|
| Natural / IUI | Ovulation Date + 266 Days | 266 Days |
| Egg Retrieval | Retrieval Date + 266 Days | 266 Days |
| Day 3 Transfer | Transfer Date + 263 Days | 263 Days |
| Day 5 Transfer (Blast) | Transfer Date + 261 Days | 261 Days |
| Day 6 Transfer | Transfer Date + 260 Days | 260 Days |