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IVF Due Date Calculator

Created by Dominika Śmiałek, MD, PhD candidate
Reviewed by Dominik Czernia, PhD and Jack Bowater
Last updated: Jan 18, 2024

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 non-in vitro pregnancies, you can use our simple due date calculator.

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 to this topic, which always seem pretty tricky.

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. All information on this website is for informational purposes only and is not intended to serve as a substitute for medical consultation. Always consult your results with a health care provider.

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

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, use the hCG levels calculator, which you can easily measure with a blood test.

💡 You may also calculate the approximate success rate with egg freezing calculator if you're planning to preserve a number of oocytes for your future treatment.

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 donor eggs cycle - an anonymous donor's eggs are 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 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.

Remember that this pregnancy due date calculator IVF also works backward. 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 was 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 attempt, 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 day, which takes place on the 14th day of your menstrual cycle. In some more complicated cases, or when a cycle is not 28 days long, use ovulation calculator to estimate that day.

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 three days pregnant.

Although today we can quickly assess the due date or pregnancy week to the most 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.


How do I calculate due date after IVF?

To calculate due date for one baby after IVF:

  1. Find the date the eggs were transferred into your uterus and the type of transmission that was carried out.
  2. If you had a Day-5 embryo transfer, add 261 days to the date of transfer.
  3. If you opted for a Day-3 transfer, add 263 days to the transfer date.
  4. If you chose to transfer your own eggs or donor eggs, add 266 days to the transfer date.
  5. To make calculations easier, you may with to subtract 104, 102, and 99 days, respectively, from the date of transfer, then add a year.

How do I calculate pregnancy weeks after IVF?

To calculate your pregnancy week after IVF:

  1. Find the date you received the embryo transfer and the type of transfer.
  2. Calculate the number of days between the transfer date and today's date.
  3. Depending on the type of transfer, add an additional number of days to the calculated number of days:
    • For a Day-5 embryo transfer, add 19 days;
    • For a Day-3 embryo transfer, add 17 days; and
    • For your own eggs or donor eggs, add 14 days.
  4. Divide the new number of days by 7 to get your pregnancy week!

How soon after IVF can you do a pregnancy test?

How soon after IVF you can accurately detect a pregnancy with a home test depends on the type of IVF treatment you received:

  • If you received a Day-5 embryo transfer, you must wait 9-10 days for an accurate reading;
  • If you had a Day-3 embryo transfer, the time you must wait is 12-14 days; and
  • If you had a egg transfer, you may need to wait 15-17 days.

However, be sure to check with your doctor if you are unsure at any time.

How far along I am if I had an IVF treatment 3 weeks ago?

If you had a successful IVF transfer 3 weeks ago, you are:

  • 33 days along if you had a Day-5 embryo transfer;
  • 31 days along if you had a Day-3 embryo transfer; and
  • 28 days along if you had your own eggs or donor eggs transferred into your uterus.
Dominika Śmiałek, MD, PhD candidate
Are you pregnant or planning to be?
I'm pregnant
Are you expecting more than one baby?
One baby 👶
Type of transmission
Day-3 embryo transfer
Transfer date
Congratulations! 🎇
Approximate due date
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