IVF Due Date Calculator
Calculate your exact due date, gestational age, and pregnancy milestones based on your embryo transfer or retrieval dates.
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How Does IVF Dating Work?
Unlike traditional dating based on a menstrual cycle, IVF dates are calculated with scientific precision based on lab milestones.
Egg Retrieval / IUI
In IVF, the day of egg retrieval is equivalent to the day of ovulation and conception (Day 14). The due date is mathematically 266 days from this procedure.
Day 3 Transfer
A Day 3 embryo has been developing for three days post-retrieval. Therefore, the due date is calculated by adding 263 days to the transfer date.
Day 5 Transfer
A blastocyst (Day 5 embryo) is five days older than conception. The due date is calculated precisely by adding 261 days to the transfer date.
Frequently Asked Questions
Why is an IVF due date more accurate than a natural conception due date?
In a natural pregnancy, the due date is usually estimated using the Last Menstrual Period (LMP) because the exact date of ovulation and conception isn't known. With IVF, the exact date of fertilization (retrieval) or the exact age of the embryo at transfer is known. This eliminates the guesswork of a varying ovulation window, making the IVF due date highly precise.
What is the difference between a Day 3 and Day 5 Embryo Transfer?
After an egg retrieval and fertilization in the lab, embryos develop for several days before being transferred back to the uterus. A Day 3 embryo (cleavage stage) has been developing for 3 days. A Day 5 embryo (blastocyst stage) has been developing for 5 days. We adjust the due date calculation math slightly depending on the embryo's age on the transfer date.
How is a Day 6 or Day 7 frozen embryo handled?
Clinically, Day 6 and Day 7 embryos are usually treated mathematically as Day 5 embryos when calculating a due date. This is because they are typically frozen at the blastocyst stage, and their developmental "clock" essentially aligns with a Day 5 transfer upon thawing and implantation.
Is a Frozen Embryo Transfer (FET) calculated differently than a Fresh Transfer?
No, the math remains the same. Whether the embryo is fresh or frozen, the key factors are the transfer date and the age of the embryo (e.g., Day 3 vs Day 5) at the time it is transferred into the uterus.
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