IVF due date calculator - day 3 and 5 transfers

Wondering when your potential due date could be after IVF? Find out with our calculator. Put in your transfer date and type (i.e. day 3 transfer, day 5 transfer) to get started.

This tool can help give you an idea of your possible pregnancy timeline, but the dates given are an estimate only. Using this calculator should not replace medical advice from your doctor.

Who is this calculator for?

Anyone who has done IVF can use this calculator. Because all it needs to work is the transfer date and type, it works for both fresh and frozen cycles, and if you used donor eggs or sperm.

How do you calculate your due date with IVF?

Typically, it takes 266 days from implantation to giving birth. So, many IVF due date calculators (including this one) use a formula based on that fact. It’s called the 266-day gestational formula.

It goes like this: to figure out the potential due date, we add 266 days to the transfer date and then subtract the age of the embryo.

Estimated due date = Transfer date + 266 days - Embryo age in days

Here’s an example. Let’s say you had a day 3 transfer on June 1st, 2026. To calculate your date:

June 1st + 266 days = February 22nd 2027

February 22nd - 3 days = February 19th

So, your potential due date would be February 19th, 2027.

If you had a day 5 transfer, your estimated due date would be two days earlier, on February 17th.

How accurate are IVF due dates?

Any estimated due date is a prediction. There’s no guarantee that this will be your baby’s birthday.

But did you know that IVF due dates are generally more accurate than those for natural conception? It’s because with IVF, we know the exact date of fertilisation (Fertilisation date = Transfer date - Embryo age).

On the other hand, when you conceive naturally you would use the date of your last period to estimate when fertilisation happened—and from there, predict the due date.

Are IVF due dates calculated differently than natural conception?

Yes, they are. The formula commonly used for natural conception is:

The first day of your last period + 280 days = Estimated due date

So, if the first day of your last period was June 1st, 2026, your due date would be 8th March 2027.

Good to know: This formula assumes that ovulation and fertilisation would happen mid-cycle, i.e. day 14 of a typical 28-day cycle. Of course, not all menstrual cycles are 28 days long and ovulation isn’t always exactly in the middle—this method just gives an educated guess.

Your fertility journey

Starting fertility treatment is one of the biggest decisions you’ll make. And it’s essential that you choose a clinic that’s right for you.

At ARGC, our approach is extremely thorough—and working with us is intense. But we work in this way to give you the best possible chance of success.

We’ll check in with you every day during treatment, giving clear advice and adjusting your plan as necessary. We’ll be right there with you at every step, doing everything we can to help you become a parent.

Wondering whether ARGC is right for you? Our advisory calls are free, no-obligation, and led by someone who can answer your specific questions about treatment, costs, and what to expect. Book a call to get started.