IVF Due Date Calculator
Calculate your estimated due date based on the embryo transfer date.
IVF Due Date Calculator – The Most Accurate Way to Predict Your Pregnancy Timeline
When you conceive through IVF, your due date is calculated differently compared to natural conception. Because IVF gives an exact timeline for fertilization and embryo transfer, an IVF due date calculator provides a much more precise pregnancy estimate.
If you have been searching for:
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then you’re in the right place. This complete guide explains how IVF due dates are calculated for 3-day, 5-day, 6-day, and frozen embryo transfers (FET), including twin pregnancies.
Why IVF Due Date Calculation Is Different
In natural conception, doctors estimate the pregnancy based on the last menstrual period (LMP) and assume ovulation occurs around day 14.
But this method is only an estimate.
In IVF:
The date of fertilization is known
The exact day of embryo development is known
The embryo transfer date is fixed
Implantation timing is controlled
This makes due date calculation extremely accurate using an IVF due date calculator.
How to Calculate Due Date for IVF
If you’re wondering how to calculate your IVF due date, it depends on two things:
Your embryo transfer date
The age of the embryo (day-3 or day-5)
5-Day Transfer
Transfer Date + 261 days
(38 weeks + 3 days)
3-Day Transfer
Transfer Date + 263 days
(38 weeks + 5 days)
Frozen Transfer (FET)
The formula is the same as fresh transfers.
5-day embryo: add 261 days
3-day embryo: add 263 days
Step-by-Step: How Do You Calculate IVF Due Date?
If your question is “How do you calculate IVF due date?”, follow this simple process:
Step 1: Check your embryo age
Was it a day-3 embryo?
A day-5 blastocyst?
A day-6 blastocyst?
Step 2: Apply the formula
Day 5 embryo: add 261 days
Day 3 embryo: add 263 days
Day 6 embryo: add 260 days
Step 3: Add these days to your exact embryo transfer date
Step 4: Keep in mind that twin pregnancies may deliver earlier
That’s all.
Examples of IVF Due Date Calculation
Example 1: 5-Day Transfer
Transfer Date: March 10
Add 261 days → Estimated Due Date: November 26
Example 2: 3-Day Transfer
Transfer Date: March 10
Add 263 days → Estimated Due Date: November 2
IVF Due Date Calculator Day-6 Embryo
Some clinics transfer embryos on day-6.
For this case:
➡️ Transfer Date + 260 day
What If You Don’t Know Your Embryo Day?
If you’re unsure whether your embryo was day-3 or day-5:
Check your clinic report
Look at your embryo grading sheet
Compare your pregnancy progress with ultrasound measurements
Most clinics transfer day-5 blastocysts, so that is the likely case.
Factors That Can Shift an IVF Due Date
Even with IVF accuracy, some things may cause early or late delivery:
Late or early implantation
Placenta issues
Preterm labor
Twin pregnancy
Maternal age
High-risk pregnancy
Previous C-section
So the due date is an estimate, not a guarantee.
IVF Due Date Week-By-Week Timeline
If you searched “due date calculator IVF week by week”, here’s a clear timeline:
Week 2: Embryo transfer
Week 4: First positive beta hCG
Week 5–6: Heartbeat detection
Week 7–8: Viability scan
Week 12: First trimester ends
Week 20: Anatomy scan
Week 28: Third trimester
Week 36: Full term for twins
Week 40: Full term for single baby