IVF FET Due Date Calculator

The IVF FET Due Date Calculator estimates your delivery date based on your embryo transfer date and the age of the embryo. This tool helps expectant parents undergoing IVF track their pregnancy timeline with clarity and confidence. Whether you are confirming your due date, planning for maternity leave, or checking current gestational age, this calculator provides accurate milestones for your journey.

Enter the date when your embryo transfer procedure was performed

How Estimated Due Date Is Calculated

The Estimated Due Date represents the projected arrival of your baby, calculated by pinpointing the exact fertilization date rather than the last menstrual period. We use a specific formula for Frozen Embryo Transfers to account for the days the embryo has already developed in the lab.

Due Date = Transfer Date + (266 days - Embryo Age)

Where:

  • Transfer Date = The day the embryo was placed in the uterus
  • Embryo Age = 3, 5, or 6 days old
  • 266 days = The average length of pregnancy from fertilization (38 weeks)

First, subtract the embryo's age at transfer from the transfer date to find the conception date. Then, add 266 days to that date. This method is highly accurate because it starts from the biological beginning of pregnancy.

What Your Estimated Due Date Means

Your Estimated Due Date is a target date used by doctors to schedule checkups and monitor growth. It serves as a roadmap for your pregnancy journey and helps you track specific developmental windows.

Planning for Birth: Use the date range of 39 to 40 weeks to schedule maternity leave and prepare your nursery. This is the "Full Term" window where lung maturity is ideal.

Viability Milestone: Calculate backwards to find the 24-week mark. This date indicates when the fetus has a chance of survival outside the womb, which is a critical milestone for high-risk pregnancies.

Important: Only about 5% of babies are born on their exact due date. A healthy delivery can happen anywhere between 37 and 42 weeks.

This calculator provides estimates based on average medical data and is for informational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult your fertility specialist or obstetrician regarding your due date and pregnancy care.

Check the milestone box to see specific trimester end dates and track your progress week by week.