IVF Due Date Calculator
Congratulations on your IVF pregnancy! Use this calculator to work out your estimated due date based on your embryo transfer date. Simply select the IVF tab, enter your transfer date, and choose whether you had a Day 3 or Day 5 (blastocyst) transfer.
How IVF Due Date Calculation Works
Calculating your due date after IVF is slightly different from a natural conception. Because the date of fertilisation is known precisely, the calculation is actually more accurate than using a last menstrual period date.
Day 5 (Blastocyst) Transfer
For a Day 5 blastocyst transfer, your due date is calculated by subtracting 19 days from your transfer date to find the equivalent last menstrual period (LMP) date, then adding 280 days (40 weeks). Alternatively, you can add 261 days directly to your transfer date.
Day 3 Transfer
For a Day 3 embryo transfer, the calculation subtracts 17 days from the transfer date to establish the equivalent LMP date, then adds 280 days. This accounts for the two fewer days of embryo development compared to a Day 5 transfer.
Fresh vs Frozen Embryo Transfers
Fresh Embryo Transfer
In a fresh transfer cycle, the embryo is transferred to the uterus within the same cycle as egg retrieval. This typically occurs 3 to 5 days after egg collection. The due date calculation remains the same regardless of whether the transfer is fresh or frozen — what matters is the day of transfer and the embryo age (Day 3 or Day 5).
Frozen Embryo Transfer (FET)
In a frozen transfer cycle, previously frozen embryos are thawed and transferred in a subsequent menstrual cycle. This approach is increasingly popular at South African fertility clinics as it allows for better endometrial preparation. The due date calculation is identical — simply enter the date of the actual transfer and the embryo age at freezing.
Typical IVF Timeline
Ovarian stimulation with hormone injections and monitoring scans
Egg retrieval (collection) procedure and fertilisation in the laboratory
Day 3 embryo transfer (if applicable) — embryo has 6-8 cells
Blastocyst transfer (if applicable) — embryo has over 100 cells
Pregnancy blood test (beta-hCG) to confirm pregnancy
Early viability scan to confirm heartbeat and location of pregnancy
Fertility Clinics in South Africa
South Africa has world-class fertility clinics offering IVF, ICSI, and other assisted reproductive technologies. Here are some of the leading centres:
Cape Fertility Clinic
Based in Cape Town, Cape Fertility is one of the leading fertility clinics in South Africa with high success rates and a comprehensive range of assisted reproduction services.
Medfem Fertility Clinic
Located in Sandton, Johannesburg, Medfem is one of South Africa's longest-established fertility centres offering IVF, ICSI, egg donation, and surrogacy services.
Vitalab Fertility Clinic
With clinics in Johannesburg and Durban, Vitalab is known for cutting-edge reproductive technology, genetic testing, and personalised fertility treatment plans.
Aevitas Fertility Clinic
Based at the Vincent Pallotti Hospital in Cape Town, Aevitas offers a full range of fertility treatments including IVF, ICSI, egg freezing, and pre-implantation genetic testing.
Tips for IVF Mums in South Africa
- Book your antenatal care early — ideally before 12 weeks. Your fertility specialist will guide you on when to transition to an obstetrician.
- Continue any prescribed medications (such as progesterone support) as directed by your fertility doctor. Do not stop without medical advice.
- Your first trimester scans are especially important after IVF. Attend all scheduled appointments for monitoring.
- Check your medical aid benefits — some schemes offer fertility cover as part of their plans, and pregnancy is a Prescribed Minimum Benefit (PMB) condition.
- Remember that once an IVF pregnancy is established, it is managed just like any other pregnancy. Your baby is developing normally!
Already know your due date? Explore our other free pregnancy tools:
Got questions?
Frequently Asked Questions
For a Day 5 blastocyst transfer, your due date is calculated by adding 261 days to your transfer date. For a Day 3 transfer, 263 days are added. Because the exact date of fertilisation is known, IVF due dates are often more accurate than LMP-based calculations.
No. The due date calculation is the same for fresh and frozen embryo transfers. What matters is the date the embryo was transferred to the uterus and the embryo age (Day 3 or Day 5) at the time of transfer.
IVF costs in South Africa typically range from R30 000 to R80 000 per cycle, depending on the clinic, medication protocol, and any additional procedures required. Some medical aids offer partial fertility cover. Speak to your clinic about payment plans.
After a positive pregnancy test, your fertility clinic will typically schedule an early viability scan at 6-7 weeks. You should then book your first antenatal visit with an obstetrician ideally before 12 weeks of pregnancy.
About the Author
Due Date Calculator SA Editorial Team
Our content is reviewed by healthcare professionals familiar with South African maternal health practices. We combine evidence-based medical information with local knowledge to support South African mums throughout their pregnancy journey. Our team includes contributors with backgrounds in midwifery, obstetrics, and maternal health education.
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