Introduction
If you had an IVF (in vitro fertilization) embryo transfer, this calculator helps you find your estimated due date. It works for fresh transfers, frozen embryo transfers (FET), and any transfer day from Day 0 (egg retrieval) through Day 5 (blastocyst) or beyond. Just enter your transfer date and embryo day, and the tool calculates the due date.
The calculator uses a simple formula: it adds 266 days minus your embryo's age to your transfer date. ACOG's guidance gives the same result: 261 days from a day-5 embryo transfer and 263 days from a day-3 transfer.1
Along with your due date, you will also see your current gestational age, estimated conception date, time remaining until delivery, a pregnancy milestone timeline, a progress chart, and a full week-by-week breakdown with baby size comparisons. These details help you track your pregnancy from start to finish.
Keep in mind that this tool gives an estimate only. Your doctor may adjust your due date based on ultrasound measurements or other factors. Always follow the guidance of your healthcare provider for the most accurate information about your pregnancy.
How to Use Our IVF Due Date Calculator
Enter a few details about your embryo transfer, and this calculator will give you an estimated due date, your current gestational age, a milestone timeline, and a full week-by-week pregnancy breakdown.
Embryo Transfer Day: Pick the day of your embryo when it was transferred. Choose Day 0 if you are using your egg retrieval date, Day 3 for a cleavage-stage embryo, or Day 5 for a blastocyst. You can also type any number from 0 to 10 in the box.
Transfer or Retrieval Date: Enter the date your embryo transfer or egg retrieval took place. This must be today or a date in the past.
Transfer Type: Select Fresh Transfer or Frozen Transfer (FET). This label is for your reference only and does not change the due date result.
Calculate Button: Press "Calculate" to see your results. Press "Reset" to clear everything and start over.
IVF Due Date Calculator
An IVF due date calculator helps you figure out when your baby will likely be born after an in vitro fertilization (IVF) transfer. In IVF, eggs are taken from the ovaries, fertilized in a lab, and then placed back into the uterus. This is called an embryo transfer. The transfer can happen on different days after fertilization, most commonly on day 3 or day 5. A day 5 transfer is called a blastocyst transfer and is the most common type today. For a more general pregnancy timeline estimate, our Due Date Calculator works from your last menstrual period.
The way this calculator works is simple. It takes your transfer date and the embryo day number, then counts forward to find your estimated due date. The formula uses 266 days (the average length of a pregnancy from conception) minus the embryo day to figure out how many days to add from your transfer date. For example, if you had a day 5 blastocyst transfer, the calculator adds 261 days to your transfer date. ACOG states the rule the same way: 261 days from a day-5 transfer and 263 days from a day-3 transfer.1
Fresh vs. Frozen Transfers
There are two main types of IVF transfers. A fresh transfer means the embryo is placed in your uterus during the same cycle the eggs were retrieved. A frozen embryo transfer (FET) means the embryo was frozen and transferred in a later cycle. Both types use the same due date formula. The only thing that matters for the calculation is the embryo day and the date of transfer.
How Gestational Age Works in IVF
Gestational age is counted from the start of your last menstrual period (LMP). In natural pregnancies, doctors use the first day of your last period to count. But with IVF, there may not be a natural LMP to use. Instead, the calculator figures out a theoretical LMP by counting backward 280 days from your due date, the conventional interval ACOG describes between the last period and the due date.1 This lets your doctor track your pregnancy the same way they would for any other pregnancy. If you are trying to pinpoint when conception likely occurred, our Conception Calculator can help.
What to Know About Your Due Date
A due date is an estimate, not an exact date, and few babies arrive on the day itself. ACOG calls a pregnancy of 41 to 42 weeks late term and one beyond 42 weeks postterm.2 Your doctor may adjust your due date based on ultrasound measurements during your first trimester. Always follow the guidance of your healthcare provider over any online calculator.