IVF Due Date Calculator

Because an IVF pregnancy has a precisely known starting point, your embryo transfer date, the due date estimate can skip the guesswork built into last-menstrual-period methods. Feed in whether the transfer used a 3-day or 5-day embryo and the tool projects your baby's likely arrival, which gives prenatal care, preparations, and expectations for your 2026 pregnancy journey a firmer foundation than conventional dating usually offers.

The arithmetic keys off the embryo's age at transfer and the standard length of a full-term pregnancy. A 3-day embryo transfer adds 263 days to the transfer date, while a 5-day transfer adds 261 days, the shorter count reflecting an embryo that is already a little further along in its development. Counting from the actual moment embryonic growth began is what makes these numbers tighter than LMP-based estimates.

Even a strong estimate stays an estimate: only about 5% of babies actually arrive on their predicted due date. The pace of fetal development and the precise timing of implantation can each nudge the real birth date one way or the other. The sensible move is to treat the date as a guidepost for the journey rather than the basis for anything rigid.