IVF Due Date Calculator

By Dominika Miszewska, PhD candidate
Last updated: Aug 04, 2021

Are you pregnant? Or maybe you're just planning to be? In any case - this IVF due date calculator (in vitro fertilization) is the perfect tool for you! It helps you estimate the day your baby will finally arrive. Also, you can check how many weeks along you are. If you're still waiting for the in vitro fertilization process, this tool can help you find the transfer date which will most likely result in your baby being born on your chosen due date.

In the article below, you can find information on what the IVF process looks like, and how exactly our pregnancy due date calculator IVF works. We not only have some answers for the most burning question: what is my due date, but also some explanation of the medical terms related with this topic, which always seem pretty tricky.

If you want to find out more about your child, check our blood type calculator.

What does the IVF process mean?

IVF (in vitro fertilization) is a method of assisted reproductive technology (ART). Before deciding to admit you to the program, a specialist will conduct various tests, such as semen analysis, infectious disease screening, uterine examination, and various tests checking the function of the ovaries. By that, they try to understand the reason why you can't have a baby. IVF process is a combination of pharmacological treatment and surgical procedures. Those procedures assist egg fertilization and subsequent implantation in the uterine wall.

  1. The first step is pharmacological treatment - it begins on the first day of your menstrual cycle. You get medication that stimulates your ovaries to produce more than one egg (one egg is typical).
  2. Step two is egg retrieval - a procedure during which doctors capture the eggs from your ovaries.
  3. Then your eggs are mixed with sperm, and after that, a physician puts one (or more) fertilized eggs into your uterus.

That is the end of the process!

IVF procedure

IVF procedure (DrKontogianniIVF by wikimedia.org)

Sometimes the IVF process works with the first batch of eggs; sometimes, you have to try a couple of times. To make sure an early-stage pregnancy is developing properly, keep an eye on the woman's hCG levels, which you can easily measure with a blood test.

Short explanation of medical terms

The date of transfer is the day on which the physician implanted the fertilized eggs in your uterine wall.

There are several types of egg transmission:

  • IVF with own eggs - your eggs are retrieved and then fertilized in a lab.
  • IVF with fresh donor eggs cycle - an anonymous donor's eggs are fertilized with sperm.
  • Fresh donor embryos cycle - an anonymous donor's eggs are retrieved and immediately fertilized with sperm.
  • Day-3 embryo transfer - the embryo consists of about 4-8 cells, and it is transferred three days after egg fertilization.
  • Day-5 embryo transfer - a 5-day embryo consists of 70-100 cells and can be also called a blastocyst. The doctor transfers it to the uterus five days after egg fertilization.

What is my due date?

For the correct calculations of your due date, you need to know on which day the eggs were transferred into your uterus and which type of transmission you chose. A typical pregnancy lasts around 266 days from the fertilization of the egg.

So, if you decided on Day-5 embryo transfer, count:

due date = date of transfer + 261

If you chose a Day-3 embryo transfer, you should calculate:

due date = date of transfer + 263

For in vitro fertilization you used either your own eggs or fresh donor eggs, so use this:

due date = date of transfer + 266

To increase the chances that the embryo survives after its implantation, more than just one embryo is often transferred. As a result, the probability you'll have more than one baby increases. If you're expecting twins, the average length of a pregnancy is 35 weeks, which is 231 days. If you're pregnant with triplets, it should last around 34 weeks, or 224 days. Not sure how much weight you should gain? Take a look at our weight gain calculator.

A baby

Remember that this pregnancy due date calculator IVF also works backwards. It means that if you're still planning your IVF transfer day, it will help you estimate the date of the transfer based on your chosen due date.

IVF due date calculator in use

To dispel any doubts about how to use the IVF due date calculator, we prepared a short example for you. Suzy is a 34-year-old woman, and she and her partner have been trying to become pregnant for the past two years without success. They decided it's time to visit a doctor and after some consultations they took the next step and started preparing for IVF. They tried twice, and finally on the third attempted it worked! The final transfer of a Day-3 embryo Suzy had was on 11th September 2019. Today she's just realized she doesn't know when to expect the baby. Of course, in 9 months, but what would be the exact date?

We know how to get her IVF due date: due date = transfer date + 266 - 3

Minus 3 days because the embryo is already three days old. For our specific case the calculation is:

11th September 2019 + 263 days = 31st May 2020

What's more, she also knows that today, 1st October, she is exactly five weeks and one day pregnant. And the baby is the size of... an apple seed.

How many weeks am I pregnant?

Our pregnancy due date calculator IVF not only gives you the day on which you'll first hold your newborn, but it also estimates the week of pregnancy you're currently in. You are most likely to have an egg implanted on your ovulation date, which takes place on 14th day of your menstrual cycle.

A typical pregnancy lasts around 40 weeks, counted from the first day of your last period, or 38 weeks from the day of egg implantation. So, if today was 27th September 2019, and the first day of your last menstrual period was on 9th July 2019, you'd be 11 weeks and two days pregnant. You can find more calculations on this topic in our conception date calculator.

Although today we can quickly assess due date or pregnancy week to the mostly likely day, most children are not born exactly on their due date. The average 5-week time span means that your baby may arrive anytime between week 37 and week 42.

We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace a professional doctor's assessment. If any health condition bothers you, consult a physician.

Dominika Miszewska, PhD candidate
Are you pregnant or planning to be?
I'm pregnant
Are you expecting more than one baby?
One baby πŸ‘Ά
Type of transmission
Day-3 embryo transfer
Transfer date
Congratulations! πŸŽ‡
Your due date is
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