Estimate your baby’s arrival date in seconds. Whether you’re an intended parent or a surrogate, this calculator helps you understand your pregnancy timeline — from embryo transfer to delivery.
Choose your method, select the date (Month / Day / Year), then calculate. Supports natural conception/IUI and IVF transfers (Day-3 or Day-5).
1) Choose method
2) Enter the date
Assumptions: LMP → 280 days (40 weeks). IVF Day-3 → transfer + 263 days (LMP−17d). IVF Day-5 → transfer + 261 days (LMP−19d).
Estimated Due Date (EDD)
Gestational Age Today
Days Until Due
Progress
0w20w40w
Trimester Ranges
First trimester
Second trimester
Third trimester
Key Milestones
🧠 How This Calculator Works
This calculator uses Nägele’s rule to estimate due dates — adding 280 days to the first day of your last period. For IVF pregnancies, we adjust based on the embryo transfer date and the embryo’s age (Day 3 or Day 5).
Results are approximate and may differ slightly based on your individual cycle length or medical factors.
🤰 For Surrogates
Tracking your due date allows better communication with your agency and medical team.
Stay informed about key milestones and appointments throughout your pregnancy.
🧭 IVF & Surrogacy Due Date Calculator — Frequently Asked Questions
This FAQ section answers the most common questions about how our IVF due date calculator works for both intended parents and surrogates. Whether your pregnancy is the result of in vitro fertilization (IVF) or a gestational surrogacy journey, this tool helps you better understand your estimated due date (EDD), gestational age, and key pregnancy milestones. It provides reliable, educational guidance for anyone navigating IVF or surrogacy, helping you track every important step from embryo transfer to delivery.
This calculator follows standard obstetric formulas used by fertility specialists and OB/GYNs. It assumes a 40-week (280-day) pregnancy when calculated from the first day of your last menstrual period (LMP). For IVF cycles, it adjusts automatically: Day-3 transfer adds 263 days and Day-5 transfer adds 261 days. Your actual due date may be adjusted by your doctor based on early ultrasound measurements.
Yes. This tool supports both natural conception and IVF transfers. Simply select “Date of Day-3” or “Date of Day-5 Blastocyst Transfer” and enter your transfer date. The calculator automatically converts your IVF transfer into an equivalent LMP and estimates your due date, current gestational age, and key pregnancy milestones.
This calculator assumes a 28-day cycle for natural conception. If your cycle is longer or shorter, your ovulation day may differ, shifting the due date by a few days. Your fertility clinic or OB/GYN can provide a more precise date using ultrasound or cycle-tracking data.
Third Trimester: Week 28 – 40 + 0 days The calculator automatically shows the exact calendar dates for each trimester based on your entered information.
Gestational age counts from the first day of your last menstrual period—about two weeks before conception actually occurs. Fetal age measures from the actual conception date. This is why gestational age is typically about two weeks longer than fetal age.
If your ultrasound measurements differ from your calculator result by more than 7 days in the first trimester, or if you’re experiencing irregular cycles or IVF complications, it’s best to confirm your estimated due date with your provider. This calculator is for educational use only and not a substitute for medical advice.
That’s because gestational age is always counted from the equivalent “LMP” (last menstrual period)—not the embryo transfer date itself. In IVF, a Day-5 blastocyst transfer corresponds to approximately 2 weeks and 5 days of gestation, while a Day-3 transfer corresponds to 2 weeks and 3 days. This convention aligns IVF pregnancies with natural conceptions, allowing doctors to compare ultrasound and growth milestones on the same gestational timeline.
Timeline diagram showing LMP day 0, ovulation/conception around day 14, IVF Day-5 blastocyst transfer aligned to gestational age 2 weeks 5 days, with due date at 40 weeks.
IVF Day-5 Transfer ≈ Gestational Age 2w5d (LMP-based dating)
LMP (0w0d)
~2w0d
Day-5 Transfer ≈ 2w5d
EDD (40w0d)
Why does the IVF due date calculator show 2w5d after a Day-5 transfer?
• Gestational age is always counted from the LMP (last menstrual period)—not from embryo transfer day.
• In IVF, a Day-5 blastocyst transfer aligns with ~2 weeks + 5 days of gestation to match natural conception dating.
• This convention keeps ultrasound growth charts and milestones on the same gestational timeline.
Day-3 transfer ≈ 2w3d · Day-5 transfer ≈ 2w5d
IVF due date calculator timeline — Day-5 blastocyst transfer is dated as gestational age 2 weeks 5 days to stay consistent with LMP-based obstetric dating.
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⚠️ Disclaimer: This calculator is for educational and informational purposes only. It is not intended to diagnose or treat any medical condition. For personalized medical advice, always consult your physician, OB-GYN, or midwife.
🌸Every Journey Begins with Health and Trust
Whether you’re preparing to become a surrogate or exploring parenthood through surrogacy, Ivy Surrogacy ensures every match meets the highest medical and ethical standards.
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