Pregnancy · IVF
IVF Due Date Calculator
Calculate EDD from embryo transfer date — more accurate than LMP-based. Day-5 blastocyst + 261 days; day-3 embryo + 263 days. Same formula for FET, ICSI, donor + PGT-A cycles.
Last reviewed 2 June 2026
IVF / FET due date
Calculate your due date from your embryo transfer
Embryo age at transfer
Enter your embryo transfer date to see your due date and current gestational age.
How IVF EDD calculated
- Day-5 blastocyst: transfer date + 261 days.
- Day-3 embryo: transfer date + 263 days.
- Fresh + frozen (FET): same formulas.
- ICSI + donor eggs + donor embryos: same.
- Surrogacy: based on transfer to surrogate.
Why more accurate than natural?
Conception date known precisely (vs ±5 days natural variation). Early ultrasound rarely changes much.
Day-3 vs Day-5
- Day-3: 6-8 cells; earlier transfer.
- Day-5 (blastocyst): better selection; higher per-transfer success; PGT-A possible.
Fresh vs frozen
- Fresh: same cycle as stimulation; OHSS risk.
- FET: cryopreserved + transferred in subsequent cycle; live birth rates similar or slightly better; lower OHSS.
Milestones from transfer
- Day 0: embryo transfer.
- Day 8-12: hCG beta test.
- Week 6-7 LMP equiv: viability scan + heartbeat.
- Week 11-13: combined screening / NIPT.
- Week 20: anomaly scan.
- Week 37+: term.
Outcomes
IVF associated with slightly higher rates of preterm birth, low birth weight, PE, placenta praevia — mostly explained by maternal age, underlying infertility, multiples. Single embryo transfer reduces multiples risk. Most IVF babies + mothers healthy.
Extra scans
Many parents have early viability scan (6-7 wk private). NIPT recommended even if PGT-A normal — verifies actual pregnancy chromosomes (mosaicism possible).
Twins / multiples
Same EDD formula. Delivery usually earlier: DCDA twins ~37 wk; MCDA ~36 wk; triplets ~32 wk.
Different scenarios
Scenario 1: Day-5 FET on 1st January
EDD = 1 Jan + 261 days = ~19 September.
Scenario 2: Day-3 fresh transfer
EDD = transfer date + 263 days.
Scenario 3: PGT-A normal embryo transferred
Still need NIPT + 20-wk anomaly scan; mosaicism + post-transfer changes possible.
Scenario 4: IVF twin pregnancy
Same EDD calculation. Plan delivery 36-37 wk usually.
Scenario 5: Anxious after long fertility journey
Early viability scan + perinatal mental health support useful.
Care guidance
- Transfer date determines EDD precisely.
- Early scan for reassurance common.
- NIPT recommended.
- Standard antenatal care from 12 weeks.
- Mental health support for anxiety.
Sources
- HFEA. Human Fertilisation and Embryology Authority guidance.
- NICE NG156. Fertility problems.
- ESHRE. European Society of Human Reproduction.
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Frequently asked questions
Why does IVF use different math?
Natural conception: EDD estimated from LMP + 14-day luteal phase (Naegele's: LMP + 280 days). IVF: EXACT day of fertilisation known + we work from embryo transfer date. (1) DAY-5 BLASTOCYST transfer starts the clock at conception + 5 days; EDD = transfer date + 261 days. (2) DAY-3 EMBRYO transfer: EDD = transfer date + 263 days. (3) FRESH transfer: similar. (4) FET (frozen embryo transfer): same formula.
How accurate is IVF EDD?
MORE ACCURATE than LMP-based natural conception EDD. Conception date precise (vs ±5 day natural variation). USED clinically as standard. EARLY ULTRASOUND can confirm but rarely changes much; small changes possible based on growth velocity. POSTNATAL: New Ballard score validation rarely needed (dates reliable).
Day-3 vs Day-5 embryo transfer?
(1) DAY-3 (cleavage stage): embryo ~6-8 cells; transferred earlier; fewer eggs needed; sometimes preferred when limited embryos. (2) DAY-5 (BLASTOCYST): more developed embryo; better selection (only viable embryos survive to day 5); higher implantation per transfer; allows PGT-A testing if pursued. CHOICE depends on embryo quality + quantity + clinic preference + age.
Fresh vs frozen embryo transfer?
(1) FRESH: embryo transferred soon after egg collection (~3-5 days); same cycle as ovarian stimulation. (2) FROZEN (FET): embryo cryopreserved + transferred in subsequent natural or medicated cycle. EVIDENCE: FET LIVE BIRTH RATES similar or slightly better; lower OHSS risk (ovarian hyperstimulation); preferred 'freeze-all' protocol increasingly common. EITHER appropriate; depends on individual + clinic protocol.
What about ICSI / donor eggs?
ICSI (Intracytoplasmic Sperm Injection): same EDD calculation as standard IVF — based on embryo transfer date. DONOR EGGS: based on donor's egg retrieval + recipient's transfer date. DONOR EMBRYOS: based on transfer date. SURROGACY: based on transfer date to surrogate. ALL roughly same formula adjusted by embryo age at transfer.
Common pregnancy milestones from IVF transfer
(1) DAY 0: embryo transfer; (2) DAY 8-12: hCG test (BETA — blood); (3) WEEK 6-7 (from LMP equivalent): viability scan + heartbeat; (4) WEEK 8-9: dating scan; (5) WEEK 11-13: combined screening / NIPT timing; (6) WEEK 20: anomaly scan; (7) WEEK 24+: viability; (8) WEEK 37+: term; (9) WEEK 40: EDD. PRIVATE early scans common after IVF.
Does IVF affect pregnancy outcomes?
MIXED. Some research: IVF associated with slightly higher rates of: preterm birth; low birth weight; PE; placenta praevia; some birth defects (small absolute increase). MOSTLY explained by: maternal age; underlying infertility cause; multiple pregnancies. SINGLE EMBRYO TRANSFER (now standard UK) reduces multiple pregnancy risks substantially. OVERALL: most IVF babies + mothers healthy.
Should I have more scans?
POST-IVF — many parents have extra early scans for reassurance. PRIVATE viability scan at 6-7 weeks common (NHS waits til 12 weeks). FETAL MEDICINE follow-up if any concerns. NIPT recommended even if PGT-A normal (verifies actual pregnancy chromosomes). EXTRA monitoring justified for high-risk groups (twins, advanced maternal age, donor pregnancies).
What if I had PGT-A / PGD?
PGT-A (preimplantation genetic testing for aneuploidy): chromosomal screen of embryo before transfer. Single euploid embryo transfer common. STILL recommended: routine antenatal screening; NIPT (verifies pregnancy); 20-week scan. PGT-A doesn't replace antenatal screening — mosaicism + post-transfer changes possible.
Anxiety in IVF pregnancy
VERY COMMON. Fertility journey often long + difficult; pregnancy after IVF often anxious. STRATEGIES: (1) Early scans for reassurance; (2) Connect with IVF community (Fertility Network UK, Resolve); (3) Counselling (specialist perinatal mental health if needed); (4) MINDFULNESS / meditation; (5) PARTNER involvement; (6) ACKNOWLEDGE feelings — anxiety is real even with healthy pregnancy.
Should I keep treating IVF differently?
After 12 weeks (viability + dating + screening): pregnancy proceeds like spontaneous pregnancy clinically. NO additional medical restrictions usually. EMOTIONAL impact persists — anxiety + bonding sometimes delayed. CONTINUE folic acid + standard pregnancy vitamins. STANDARD antenatal care + IVF clinic follow-up coordination.
Twin / multiple from IVF — different EDD?
SAME calculation from transfer date — even for twins / triplets. DELIVERY usually earlier than singletons regardless of EDD: DCDA twins ~37 weeks; MCDA ~36 weeks; triplets ~32 weeks. TWIN EDD remains reference point for gestational age + scan timing.
How does this relate to other calculators on BumpBites?
Companion: /calculators/due-date; /calculators/due-date-countdown; /calculators/pregnancy-week; /calculators/nipt-cfdna; /calculators/first-trimester-screen; /calculators/twin-probability; /calculators/conception-date.