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IVF & FET Due Date Calculator
Enter the embryo transfer date to estimate your surrogate's due date for IVF and frozen embryo transfer cycles. Use the result as a planning baseline until the first prenatal ultrasound confirms the clinical estimated due date.
A fast estimate of the due date based on the transfer details you already have. It is designed to help intended parents plan the next medical, legal, and travel milestones after transfer.
This is not a clinical diagnosis. Your surrogate's OB-GYN confirms or adjusts the estimated due date at the first ultrasound, and a small difference from the calculator is normal.
Calculate the Estimated Due Date
Select the embryo age on transfer day, then enter the exact transfer date. Fresh and frozen transfers are dated the same once embryo age is known.
Select the embryo age on transfer day and enter the transfer date. Fresh and frozen transfers are dated the same once embryo age is known.
Use the embryo age used by your clinic on transfer day.
Use the actual transfer date, not retrieval, fertilization, or beta hCG date.
If you are unsure which embryo age was used on transfer day, your clinic or Delivering Dreams coordinator can confirm whether the transfer was performed with a Day 3 embryo, Day 5 blastocyst, or Day 6 blastocyst. If you are still comparing transfer pathways, the Frozen Embryo Transfer (FET) overview and How the Process Works page give more context.
Select embryo age at transfer
Start with the embryo age used on transfer day: Day 3, Day 5, or Day 6. If you are planning a frozen cycle and want the broader medical context, see our FET page.
Enter the exact transfer date
Use the calendar date on which the embryo was transferred to the surrogate. Do not substitute the egg retrieval date, fertilization date, or the date the pregnancy test turned positive.
Use the result as a planning baseline
Use the estimated due date to think through the next milestones, but expect the medical team to confirm or refine it after the first ultrasound.
IVF vs. Frozen Embryo Transfer: How the Date Is Calculated
Due-date dating in IVF is based on embryo age at transfer. The transfer date becomes the anchor point, then the embryo's developmental stage is used to calculate gestational age correctly.
Day 5 transfers usually calculate to 261 days from transfer
A Day 5 blastocyst has already developed for five days before transfer, so those lab days are subtracted from the standard post-fertilization timeline. Fresh and frozen Day 5 transfers are dated the same way because the embryo's biological age is the same at transfer.
Day 3 transfers usually calculate to 263 days from transfer
A Day 3 embryo has spent fewer days developing in the laboratory before transfer, so the estimated due date lands about two days later than a Day 5 transfer from the same calendar date.
Important: the freezing process itself does not change how gestational age is dated. Frozen embryo transfers are calculated using the same developmental-stage logic as fresh transfers. The most accurate dating still comes from the first ultrasound, not from the cycle label alone.
Clinical references
This page follows the general clinical principle that pregnancies resulting from assisted reproductive technology should be dated using embryo age and transfer date, as summarized by AIUM/ACOG/SMFM. For background on ART-based gestational dating as a reference standard, see this PubMed paper on gestational age validation in ART pregnancies and this open-access IVF ultrasound dating study.
Understanding Your Results
The date returned here is an estimated due date, not a guaranteed birthday. It is best understood as a midpoint used for planning, not as the exact day the baby will be born.
Ultrasound is the final authority
At approximately 7-8 weeks of gestational age, the OB-GYN measures crown-rump length and confirms or adjusts the estimated due date. If the ultrasound differs materially from the calculator result, the clinical date usually takes priority.
A small difference is normal
Small discrepancies between the calculator result and the ultrasound date are part of normal biological variation. They do not mean the transfer was mistimed or that there is a problem with the pregnancy.
Most births do not happen on the exact EDD
Many healthy pregnancies deliver before or after the estimated due date. That is why it is better to use the date as a planning range for travel, birth attendance, and paperwork rather than as a fixed deadline.
Positive pregnancy test
The calculator gives you a first planning baseline as soon as the transfer is confirmed to have worked.
First prenatal visit
Usually scheduled around 6-8 weeks of gestational age to confirm heartbeat and clinical dating.
Routine pregnancy tracking
Prenatal monitoring, anatomy scan planning, and legal preparation are all easier once the clinical due date is set. The timeline estimator helps connect those milestones.
Birth and exit timeline
The confirmed EDD helps shape travel, birth attendance, registration, and homecoming logistics.
What Comes Next After You Know the Due Date
Once you have the estimated due date, the next step is to use it to organize the rest of the journey: ultrasound timing, milestone tracking, travel planning, and the legal process around birth and homecoming.
Use the date to plan the next milestones
- Track the first prenatal ultrasound and heartbeat confirmation.
- Plan around later pregnancy milestones, including the anatomy scan.
- Use the date to think through travel and birth attendance timing.
- Map the broader sequence in the surrogacy timeline estimator and How the Process Works.
Know what may change the date later
The most common reason for a later adjustment is ultrasound dating at 7-8 weeks. In some cases, twin gestation or other clinical observations can also affect how the pregnancy is monitored and which delivery window the doctor expects.
For informational planning only
This calculator is for informational purposes only and does not constitute medical advice. Due date estimates follow standard gestational age conventions and may differ from clinical dating by ultrasound. Consult your surrogate's OB-GYN or reproductive endocrinologist for guidance specific to your case.
Frequently Asked Questions
These are the most common questions intended parents ask once they begin planning around an embryo transfer date and estimated delivery date.
How accurate is this IVF due date calculator?
What is the difference between a Day 3 and a Day 5 embryo transfer due date?
Can I use this calculator for a frozen embryo transfer (FET)?
Why might my surrogate's doctor give a different due date?
When should I expect the first ultrasound confirmation?
Can I use this calculator specifically for a surrogate pregnancy?
Does the due date change if two embryos were transferred?
Need help interpreting your result?
If you want help connecting the calculator result to the next steps in your journey, a Delivering Dreams coordinator can walk you through transfer timing, ultrasound expectations, milestone planning, and the broader surrogacy process.
The best international surrogacy programs in Ukraine, Slovakia and Ghana for couples and single men and women. Our team is here to support you every step of the way, and we're committed to ensuring that your surrogacy experience is positive, empowering, and fulfilling. So please don’t hesitate to reach out with any questions, we will be glad to give you any information you might need! 
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