IVF Due Date Calculator
Calculate your due date from IVF embryo transfer — Day 3, Day 5, or frozen embryo transfer (FET)
IVF / FET Due Date Calculator
Transfer date can be in the past or today.
How IVF Due Dates Are Calculated
Calculating your IVF due date is actually more precise than traditional LMP-based methods, because with in vitro fertilization, the exact age of the embryo at transfer is known. Whether you’re using a fresh or frozen embryo transfer, our IVF due date calculator applies the same proven formula used by fertility clinics worldwide.
The formula is straightforward: Due Date = Transfer Date + (266 − Embryo Age). For a Day 5 blastocyst transfer, this means adding 261 days. For a Day 3 embryo, you add 263 days. The reason we subtract the embryo’s age is because that embryo is already 3 or 5 days old at the time of transfer — it didn’t just begin its development. This calculate due date from IVF formula is medically recognized and widely used by reproductive endocrinologists.
Day 3 vs Day 5 IVF Transfer
Embryo has divided into 6–10 cells. Often transferred when fewer embryos are available for selection.
Embryo has developed to blastocyst stage. Most IVF centers now prefer Day 5 transfers for higher success rates.
Frozen Embryo Transfer (FET) Due Date
Many patients ask whether FET due date calculation differs from fresh IVF. The answer is no — the formula is identical. Whether your embryo was fresh or frozen, what matters is the embryo’s developmental age at the time of transfer. A frozen Day 5 blastocyst is still 5 days old when it’s thawed and transferred, so the same +261 days formula applies. Our FET due date calculator handles this automatically.
IVF Pregnancy Timeline
After a successful IVF transfer, here’s what to expect in your IVF pregnancy timeline. Your first beta hCG blood test typically occurs 9–14 days post transfer. If positive, a repeat test 48 hours later confirms doubling. Your first ultrasound usually happens at 6–7 weeks gestational age to confirm a heartbeat. From there, your IVF pregnancy follows the same milestones as any other pregnancy.
One important note: IVF pregnancies have a slightly higher rate of multiples (twins and triplets), which can affect pregnancy length. Twin pregnancies typically deliver at 36–38 weeks. Your reproductive specialist will monitor you closely throughout. Use our best IVF due date calculator as a starting estimate, and let your ultrasound confirm the gestational age around week 7–8.
Frequently Asked Questions
Common questions answered by our medical team
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