IVF Due Date Calculator

IVF due date & pregnancy timeline

From your clinic date to a clear planning timeline

Use the recorded transfer details or retrieval date to estimate a due date, today’s gestational age, trimester ranges, and key milestones.

Estimated IVF due date

Your planning timeline

Example calculation

Your estimated due date isOctober 8, 2026

Today’s estimated gestational age: Loading today’s date….

Pregnancy dating today: Loading today’s date…
Until estimated due date: Loading…
ACOG full-term window: Oct 1 – Oct 14, 2026

Clinic event usedEmbryo transfer dateDay 5 embryo · +261 days

Dating age on event day2 weeks 5 daysObstetric calendar age, not time since transfer

LMP-equivalent anchorJan 1, 2026Derived for gestational dating only

Change dates or recalculate

This calendar estimate cannot confirm pregnancy, implantation, viability, fetal growth, or the actual birth date. Use the due date established by your fertility or prenatal-care team.

Dates from your IVF estimate

Your pregnancy timeline

The marker uses today’s calendar date. Trimester boundaries follow ACOG gestational-age definitions and may be updated by your care team.

First trimesterJan 1 – Apr 8, 20260+0 – 13+6

Second trimesterApr 9 – Jul 15, 202614+0 – 27+6

Third trimesterJul 16 – Oct 8, 202628+0 – due date

Week 5Feb 5, 2026

Early development

The brain and spinal cord are beginning to take shape. Development varies from pregnancy to pregnancy.

Week 12Mar 26, 2026

Dating scan window

A dating scan is commonly offered around 11 to 14 weeks and may revise the estimated due date.

Week 20May 21, 2026

Mid-pregnancy scan

The 20-week screening scan is commonly offered between 18 and 21 weeks.

Week 28Jul 16, 2026

Third trimester begins

The third trimester begins at 28 weeks and 0 days under the ACOG trimester definition.

Week 37Sep 17, 2026

Early term begins

ACOG defines early term as 37 weeks and 0 days through 38 weeks and 6 days.

Week 40Oct 8, 2026

Estimated due date

The estimated due date is a planning estimate, not a deadline or a prediction of the actual birth date.

View all 42 weekly date rangesWeek 40 starts on the estimated due date

Week 1Jan 8 – Jan 14, 20261+0 – 1+6

Week 2Jan 15 – Jan 21, 20262+0 – 2+6

Week 3Jan 22 – Jan 28, 20263+0 – 3+6

Week 4Jan 29 – Feb 4, 20264+0 – 4+6

Week 5Feb 5 – Feb 11, 20265+0 – 5+6

Week 6Feb 12 – Feb 18, 20266+0 – 6+6

Week 7Feb 19 – Feb 25, 20267+0 – 7+6

Week 8Feb 26 – Mar 4, 20268+0 – 8+6

Week 9Mar 5 – Mar 11, 20269+0 – 9+6

Week 10Mar 12 – Mar 18, 202610+0 – 10+6

Week 11Mar 19 – Mar 25, 202611+0 – 11+6

Week 12Mar 26 – Apr 1, 202612+0 – 12+6

Week 13Apr 2 – Apr 8, 202613+0 – 13+6

Week 14Apr 9 – Apr 15, 202614+0 – 14+6

Week 15Apr 16 – Apr 22, 202615+0 – 15+6

Week 16Apr 23 – Apr 29, 202616+0 – 16+6

Week 17Apr 30 – May 6, 202617+0 – 17+6

Week 18May 7 – May 13, 202618+0 – 18+6

Week 19May 14 – May 20, 202619+0 – 19+6

Week 20May 21 – May 27, 202620+0 – 20+6

Week 21May 28 – Jun 3, 202621+0 – 21+6

Week 22Jun 4 – Jun 10, 202622+0 – 22+6

Week 23Jun 11 – Jun 17, 202623+0 – 23+6

Week 24Jun 18 – Jun 24, 202624+0 – 24+6

Week 25Jun 25 – Jul 1, 202625+0 – 25+6

Week 26Jul 2 – Jul 8, 202626+0 – 26+6

Week 27Jul 9 – Jul 15, 202627+0 – 27+6

Week 28Jul 16 – Jul 22, 202628+0 – 28+6

Week 29Jul 23 – Jul 29, 202629+0 – 29+6

Week 30Jul 30 – Aug 5, 202630+0 – 30+6

Week 31Aug 6 – Aug 12, 202631+0 – 31+6

Week 32Aug 13 – Aug 19, 202632+0 – 32+6

Week 33Aug 20 – Aug 26, 202633+0 – 33+6

Week 34Aug 27 – Sep 2, 202634+0 – 34+6

Week 35Sep 3 – Sep 9, 202635+0 – 35+6

Week 36Sep 10 – Sep 16, 202636+0 – 36+6

Week 37Sep 17 – Sep 23, 202637+0 – 37+6

Week 38Sep 24 – Sep 30, 202638+0 – 38+6

Week 39Oct 1 – Oct 7, 202639+0 – 39+6

Week 40Oct 8 – Oct 14, 202640+0 – 40+6

Week 41Oct 15 – Oct 21, 202641+0 – 41+6

Week 42Oct 22 – Oct 28, 202642+0 – 42+6

Formula and review status

Estimates an obstetric due date from an embryo transfer with declared embryo age or from an egg-retrieval/fertilization date.

Formula: health.ivf-due-date.v1
Version: 1.0.0
Execution: release

ART event-date arithmetic

IVF Due-Date Dating Starts With the Clinic-Recorded Event and Embryo Age

Assisted-reproduction dating is not a generic LMP guess. Choose an embryo-transfer or egg-retrieval/fertilization record, copy its exact date, and supply the documented Day 3, Day 5, or Day 6 embryo age for a transfer. Spontaneous-pregnancy LMP and known-fertilization branches remain in the pregnancy term calculator.

Side-by-side guide · ART event-date arithmetic

Match the IVF Input to the Recorded Treatment Event

Day 3 transfer: Transfer date + 263 days
Day 5 or Day 6: +261 or +260 calendar days
Retrieval branch: Retrieval/fertilization date + 266 days

Embryo transfer
Use the transfer date and the developmental age stated by the clinic. Fresh or frozen status alone does not tell the calculator whether the transferred embryo was Day 3, Day 5, or Day 6.
Egg retrieval or fertilization
This branch treats the recorded date as developmental day zero and adds 266 days. It does not require an embryo-age selector because age has not been carried into a later transfer event.
Ordinary LMP record
Do not route an LMP through the IVF form. Obstetric LMP dating uses 280 days and belongs to the general pregnancy timeline, subject to the EDD established by the care team.

IVF Due-Date Dating Starts With the Clinic-Recorded Event and Embryo Age: Assisted-reproduction dating is not a generic LMP guess. Choose an embryo-transfer or egg-retrieval/fertilization record, copy its exact date, and supply the documented Day 3, Day 5, or Day 6 embryo age for a transfer. Spontaneous-pregnancy LMP and known-fertilization branches remain in the pregnancy term calculator.

Match the IVF Input to the Recorded Treatment Event

Embryo transfer

Use the transfer date and the developmental age stated by the clinic. Fresh or frozen status alone does not tell the calculator whether the transferred embryo was Day 3, Day 5, or Day 6.

Egg retrieval or fertilization

This branch treats the recorded date as developmental day zero and adds 266 days. It does not require an embryo-age selector because age has not been carried into a later transfer event.

Ordinary LMP record

Do not route an LMP through the IVF form. Obstetric LMP dating uses 280 days and belongs to the general pregnancy timeline, subject to the EDD established by the care team.

Derive the Embryo-Age Offset Transparently

Resolve developmental age
Apply three, five, or six days exactly as recorded. The calculator does not infer embryo age from calendar spacing, cycle type, or memory.
Subtract age from 266
The remaining interval is 263, 261, or 260 whole days after transfer. The retrieval/fertilization branch keeps the full 266-day interval.
Add Gregorian days
The calculation traverses actual month lengths and leap days. It also shows a notional LMP-equivalent date so the result can be understood on the 280-day obstetric timeline.

Why ART Dating Should Not Be Replaced by an Ovulation Estimate

ACOG states that pregnancies resulting from ART should use ART-derived gestational age and that embryo age plus transfer date should assign the EDD. The ovulation date planner models a regular spontaneous cycle from menstrual timing; it does not know the laboratory developmental stage or treatment event and therefore cannot substitute for the ART record.

Similarly, the conception date calculator keeps embryo transfer outside its generic known-conception branch. A transfer date is not identical to fertilization, implantation, or the onset of a clinical pregnancy. The explicit event label prevents those different biological and clinical moments from collapsing into one ambiguous date.

Keep IVF Outcomes and Clinical Decisions Beyond the Date Output

The estimate does not predict implantation, a positive test, clinical pregnancy, viability, multiple gestation, fetal growth, or the actual delivery day.
Use the fertility clinic's recorded event, embryo age, and established EDD. Ask the care team to resolve missing or conflicting records rather than guessing a developmental day.
Do not change medication, testing, activity, transfer follow-up, or prenatal appointments because of this web result. Those decisions belong to qualified professionals using the full treatment record.
Do not use the notional LMP date as a claim that menstruation occurred on that day; it is a derived coordinate for gestational-age convention.

Reconcile the IVF Estimate With the Established Obstetric Record

Save the calculation basis, reference date, embryo age, days added, and result together. That audit trail makes a difference easy to inspect if another app used the wrong embryo day or treated transfer as fertilization. It does not authorize changing the EDD already documented for clinical care.

ACOG recommends determining, discussing, and clearly documenting gestational age and EDD as soon as appropriate information is available, with later changes reserved for limited circumstances. This independent calculator is educational calendar arithmetic, not medical advice; the fertility and obstetric teams' record takes priority.

Important limitations

This is educational calendar arithmetic, not confirmation of pregnancy, implantation, viability, fetal growth, treatment success, or the actual birth date. Use the due date and monitoring plan established by your fertility and prenatal-care team.

Review the stated scope, calculation method, assumptions, supported inputs, and effective dates, and obtain qualified advice before using a high-stakes result.

This formula passed its registered engineering tests and is published under an explicit site-owner policy authorization. No independent expert, QA, editorial, legal, or third-party review is claimed. Verify consequential results with a qualified professional.

This subject may affect health, finance, tax, legal, or other consequential decisions. It has not received an independent domain-expert review; consult a qualified professional before relying on it.

ART event-date arithmetic

IVF Due-Date Dating Starts With the Clinic-Recorded Event and Embryo Age

Side-by-side guide · ART event-date arithmetic

Match the IVF Input to the Recorded Treatment Event

Day 3 transfer: Transfer date + 263 days
Day 5 or Day 6: +261 or +260 calendar days
Retrieval branch: Retrieval/fertilization date + 266 days

Embryo transfer
Use the transfer date and the developmental age stated by the clinic. Fresh or frozen status alone does not tell the calculator whether the transferred embryo was Day 3, Day 5, or Day 6.
Egg retrieval or fertilization
This branch treats the recorded date as developmental day zero and adds 266 days. It does not require an embryo-age selector because age has not been carried into a later transfer event.
Ordinary LMP record
Do not route an LMP through the IVF form. Obstetric LMP dating uses 280 days and belongs to the general pregnancy timeline, subject to the EDD established by the care team.

Match the IVF Input to the Recorded Treatment Event

Embryo transfer

Use the transfer date and the developmental age stated by the clinic. Fresh or frozen status alone does not tell the calculator whether the transferred embryo was Day 3, Day 5, or Day 6.

Egg retrieval or fertilization

This branch treats the recorded date as developmental day zero and adds 266 days. It does not require an embryo-age selector because age has not been carried into a later transfer event.

Ordinary LMP record

Do not route an LMP through the IVF form. Obstetric LMP dating uses 280 days and belongs to the general pregnancy timeline, subject to the EDD established by the care team.

Derive the Embryo-Age Offset Transparently

Resolve developmental age
Apply three, five, or six days exactly as recorded. The calculator does not infer embryo age from calendar spacing, cycle type, or memory.
Subtract age from 266
The remaining interval is 263, 261, or 260 whole days after transfer. The retrieval/fertilization branch keeps the full 266-day interval.
Add Gregorian days
The calculation traverses actual month lengths and leap days. It also shows a notional LMP-equivalent date so the result can be understood on the 280-day obstetric timeline.

Why ART Dating Should Not Be Replaced by an Ovulation Estimate

Keep IVF Outcomes and Clinical Decisions Beyond the Date Output

The estimate does not predict implantation, a positive test, clinical pregnancy, viability, multiple gestation, fetal growth, or the actual delivery day.
Use the fertility clinic's recorded event, embryo age, and established EDD. Ask the care team to resolve missing or conflicting records rather than guessing a developmental day.
Do not change medication, testing, activity, transfer follow-up, or prenatal appointments because of this web result. Those decisions belong to qualified professionals using the full treatment record.
Do not use the notional LMP date as a claim that menstruation occurred on that day; it is a derived coordinate for gestational-age convention.

Choose the clinic-recorded event

Your planning timeline

Early development

Dating scan window

Mid-pregnancy scan

Third trimester begins

Early term begins

Estimated due date

Embryo transfer

Egg retrieval or fertilization

Ordinary LMP record

Match the IVF Input to the Recorded Treatment Event

Embryo transfer

Egg retrieval or fertilization

Ordinary LMP record

Derive the Embryo-Age Offset Transparently

Why ART Dating Should Not Be Replaced by an Ovulation Estimate

Keep IVF Outcomes and Clinical Decisions Beyond the Date Output

Reconcile the IVF Estimate With the Established Obstetric Record

Important limitations

Choose the clinic-recorded event

Your planning timeline

Early development

Dating scan window

Mid-pregnancy scan

Third trimester begins

Early term begins

Estimated due date

Embryo transfer

Egg retrieval or fertilization

Ordinary LMP record

Match the IVF Input to the Recorded Treatment Event

Embryo transfer

Egg retrieval or fertilization

Ordinary LMP record

Derive the Embryo-Age Offset Transparently

Why ART Dating Should Not Be Replaced by an Ovulation Estimate

Keep IVF Outcomes and Clinical Decisions Beyond the Date Output

Reconcile the IVF Estimate With the Established Obstetric Record