About this IVF due date calculator

• Shows your EDD, gestational age (weeks + days), and trimester.
• Works for fresh and frozen (FET) transfers.
• Requires just two inputs: transfer date + embryo age at transfer (day-3 or day-5).

How to use it

• Select Day-3 or Day-5 embryo.
• Enter your embryo transfer date.
• View your results instantly.

How the calculation works

• Pregnancy length by convention is ~280 days from LMP or 266 days from fertilization.
• For IVF we know embryo age at transfer, so we add:
  • Day-3 transfer: +263 days to the transfer date (266 − 3).
  • Day-5 transfer: +261 days to the transfer date (266 − 5).
• If you prefer an “LMP” for medical forms, use fertilization date − 14 days (your clinic can provide this).

Accuracy & limitations

• IVF dating is typically very precise; your clinic may confirm with an early ultrasound.
• The calculator assumes a singleton 40-week timeline for the EDD.
• Twins or more: many deliver earlier; your care plan may target earlier milestones.
• Donor eggs, ICSI, and PGT do not change the calculation.
• Individual health factors can still shift birth timing.

Key prenatal milestones (approximate)

• 6–10 weeks: First prenatal visit/early ultrasound (clinic dependent).
• 10–13 weeks: First-trimester screening/NIPT (if chosen).
• 18–22 weeks: Anatomy ultrasound.
• 24–28 weeks: Glucose screening.
• 36–37 weeks: Group B strep (GBS) test.

FAQs

• Does a frozen embryo change the math?
  No—use the transfer date and the embryo’s age at transfer (day-3 or day-5).
• Do donor eggs affect my due date?
  No. Dating is based on embryo age and transfer date.
• Why might my clinic adjust the date?
  They may refine it after an early ultrasound (CRL measurement).
• Can I enter an LMP instead?
  IVF charts often use an “IVF LMP” = fertilization date − 14 days, but transfer-based dating is standard.
• Twins—what should I expect?
  EDD is shown at 40 weeks, but many twin pregnancies deliver earlier; follow your clinician’s plan.

Note: This information is educational and not medical advice. If you have severe pain, heavy bleeding, fever, signs of ectopic pregnancy (one-sided pain, shoulder pain, dizziness), or anything that worries you, seek medical care promptly.