Due Date from IVF Transfer Calculator

About this calculator

Due dates calculated from an IVF cycle use the embryo transfer date instead of the last menstrual period, because IVF pinpoints the exact age of the embryo at transfer — a day-3 cleavage-stage embryo or a day-5 blastocyst — which is far more precise than estimating ovulation timing from a reported LMP. The standard method is: due date = transfer date + 266 days − embryo age at transfer (so 263 days out for a day-3 transfer, or 261 days for a day-5 blastocyst transfer), which mirrors the standard 40-week (280-day) pregnancy count measured from a theoretical last period.

Fertility clinics and the patients going through IVF or FET (frozen embryo transfer) cycles use this transfer-based calculation because it removes the ambiguity of a patient's actual ovulation date, giving a more reliable estimated due date for prenatal care scheduling than a standard LMP-based estimate would. It's presented to patients right after a positive pregnancy test to set expectations for the pregnancy timeline ahead.

This calculator takes your embryo transfer date and the embryo's age at transfer (day 3 or day 5), and returns your estimated due date along with days and weeks remaining.