IVF Due Date Calculator
Calculate due date from IVF transfer date. Day-3 and day-5 embryo transfer. Free IVF calculator.
How IVF Due Dates Differ
IVF due dates are more precise than natural conception dates because the exact fertilization date is known. For a Day 5 blastocyst transfer, subtract 19 days from the transfer date to get the equivalent last menstrual period (LMP) date, then add 280 days. For Day 3 embryos, subtract 17 days. This LMP-equivalent date is what your OB will use for all gestational age calculations. IVF pregnancies are typically dated by transfer date in the first trimester, then confirmed or adjusted by the dating ultrasound at 7-8 weeks.
IVF Pregnancy Timeline Differences
IVF pregnancies carry slightly different monitoring schedules. Most fertility clinics do an early ultrasound at 6-7 weeks (confirming heartbeat), a graduation ultrasound at 8-10 weeks, then transfer care to an OB. Because IVF pregnancies have higher rates of multiples and slightly elevated risk of certain complications (preeclampsia, gestational diabetes), many OBs monitor more closely with additional ultrasounds or blood work. Progesterone support typically continues through 10-12 weeks. The due date itself follows the same 40-week timeline as any pregnancy — the baby does not know how it was conceived.
IVF babies have the most precisely documented conception dates of any pregnancies in human history. Every embryo has an exact date and time of creation recorded in the lab. This precision makes IVF due dates accurate to within 1-3 days, versus a 2-week uncertainty window for naturally conceived pregnancies.
