Our patients kept asking – so we built one! Our fantastic calculator estimates your IVF due date – whether you’re expecting one baby, twins or triplets. What’s more, it covers all fertility treatments, including FETs. Simply select your treatment type and your egg retrieval or embryo transfer date. We think it’s the best IVF due date calculator around!
Disclaimer: Every pregnancy is different, so dates given are approximate. You must not rely on this calculator as a substitute for medical diagnosis or advice from a healthcare professional.
An IVF due date calculator estimates your due date after fertility treatment. It also confirms the age of your pregnancy. Our own calculator uses your egg retrieval day, or embryo transfer day, as the starting point. Unlike general pregnancy calculators, a good IVF due date calculator (like ours!) works for fresh and frozen cycles.
Select “IVF with own eggs” and enter your egg retrieval date. (Some calculators request the embryo transfer date – but transfer timings can vary after an IVF cycle, so we go by the egg retrieval date.) The result shows the gestational age of your pregnancy (in weeks and days). It also gives an estimated due date for a singleton, twin or triplet pregnancy.
Choose from either “day-3 frozen embryo transfer” or “day-5 frozen embryo transfer” on the dropdown box. If you’re not sure which, ask your clinic. (In most cases, it will be day-5.) Then enter your embryo transfer date. You’re 19 days pregnant – from a dating perspective – if you transferred a day-5 embryo. Your estimated due date is based on this (somewhat confusing) fact.
A day-5 embryo transfer means your pregnancy is two days “older” than a day-3 embryo transfer. The calculator builds that in. So, if you transfer a day-5 blastocyst, your gestational age on transfer day is treated as two weeks and five days. A day-3 transfer means you are two weeks and three days pregnant on transfer day.
LMP (last menstrual period) dating assumes ovulation on day 14. This isn’t always the case with fertility treatment. IVF and FET cycles give us precise timings on two key milestones: egg retrieval day and embryo transfer day. If you have a frozen embryo transfer, no egg retrieval physically took place three or five days earlier. But a due date calculator still works, as you can state how many days after egg collection your embryo was frozen.
It’s pretty accurate. A good calculator, built correctly, is certainly a reliable estimator. This is because the exact dates of egg retrieval or embryo transfer are known. Of course, the speed of embryo development, and precisely when implantation happens, varies. Ultrasound scans (around 6.5 weeks and 12 weeks for most fertility patients) are therefore the most accurate way to date your pregnancy and estimate the due date.
It’s entirely possible. Always be guided by the pregnancy scan result. The detailed measurements in a scan report (for example, crown-rump length) are better indicators of fetal growth. A doctor can assess the results as part of the ongoing management of your pregnancy.
Yes. For any fresh cycle (e.g. fresh donor eggs or fresh donor embryos) enter the egg retrieval date as prompted. For a frozen cycle, enter the embryo transfer date and whether a day-3 or day-5 embryo was used (day 5 is more likely, and often more optimal).
No. Whether or not fertilisation happened via standard IVF, or ICSI, doesn’t affect gestational dating. The calculator’s logic is based on key fertility-treatment dates, not what your embryologist did. That’s true for other lab techniques done on egg retrieval day (e.g. PICSI, MACS or MFSS).
It’s not that common to have a day-6 embryo transfer, but it can happen. Or any fresh cycle, selecting the egg retrieval date ensures an accurate calculation. For frozen cycles, select “day 5” and remember to tell your doctor or midwife that your embryo was “one day older” on transfer day. This is relevant to when your fertility medication is tapered off. It becomes less relevant after the first trimester.
A multiple pregnancy is more likely to deliver earlier than a single pregnancy. Our IVF due date calculator always provides an estimated due date for single, twin and triplet pregnancies. As this is based on general stats, only a healthcare professional can advise on your specific due date and the pregnancy itself.
Our calculator only allows for one or the other. For fresh cycles, enter the egg retrieval date. For frozen cycles, choose the embryo transfer date, plus embryo age. Both routes should converge closely.
Generic pregnancy apps assume natural conception and midcycle ovulation. IVF due date calculators, including ours, are based on known dates in a fertility treatment cycle. Being able to pinpoint these dates (egg collection day or embryo transfer day) allows for more accurate results. If two IVF calculators display markedly different results, one of them may have been coded incorrectly.
No. Whether your FET was natural or medicated doesn’t change the metrics. Input the transfer date and the age of the embryo when it was frozen (day 3 or 5). Your endometrium may have grown more “naturally”, and you may have had a trigger shot, but the calculator still works.
You can use your clinic’s estimate initially, until your official dating scan, which is definitive. Good IVF calculators should align with clinic estimates. But all ultrasound scans, even any you have before the all-important 12-week scan, monitor fetal health and growth.
No. Genetic testing doesn’t alter the way the calculator works. PGT-A may influence embryo selection, but not how the days and weeks of a pregnancy are counted. Even if you had an endometrial scratch prior to your treatment cycle (an “injury” to your endometrium rather than your embryo) the dating is unaffected.
Your estimated due date stays the same: A planned or emergency induction or c-section might happen before or after your estimated due date. Every pregnancy is different. When real life steps in, due date calculations are set aside.
I found the IVF calculator very helpful. After the massive stress of our treatment, it was nice to finally see my due date in black and white. We had donor egg IVF, so being able to enter the treatment date, press go and be told when the big day will happen was so reassuring – we could finally start to believe it LOL! I am expecting twins (we transferred two embryos). I like the way the calculator takes this into account, and that the twins’ due date is earlier – no complaints there! A useful tool, thank you for building it.
It works for IVF and normal conception, and we had the latter. We used the calculator a number of times, not just to look at the estimated delivery date but also to see how far gone I was at various points. I was always confused on how a pregnancy was dated. It was therefore an eye-opener, when I first used it, to see that my pregnancy was more advanced than I had thought. This prompted me to see my GP more quickly, involve the midwife sooner, and ask for all the other checks and scans I needed. It’s the most reliable calculator we found (tried about five!).
The calculator was invaluable. After our IVF cycle we were rather confused about dates, such as when to have the first scan after our positive result. Knowing I was more than four weeks’ pregnant when we did the home HCG test meant we could book a private scan at exactly the right time – about two weeks later, I think. I was also worried about when to start reducing my meds. The clinic had told me, but the calculator updated me on exactly how pregnant I was, helping with my anxiety, as I then knew when to start and stop the progesterone. Thank you for a great tool!
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