IVF Birth Calculator
Estimate the birth date from your egg retrieval day, the moment of fertilisation.
Awaiting Data
Enter your details and tap Calculate to see your results appear here.
Your result appears here.
What it measures
Egg retrieval is fertilisation day in an IVF cycle. From that point, a full term pregnancy runs about 266 days. Counting forward from retrieval gives a clean estimate of the birth date, free of the usual dating guesswork.
This tool also shows how far along you are today. For a transfer based estimate, see our IVF Due Date Calculator, and track each week with the Pregnancy Calculator.
How to use this calculator
- Enter your egg retrieval date.
- Tap Calculate for the estimated birth date.
- Read your current week and trimester.
The formula used
- retrieval date
- The day eggs were collected and fertilised.
- 266 days
- Length of pregnancy from conception.
Understanding Your Results
Tips to Improve
- Confirm dating with an early scan.
- Keep any prescribed support going.
- Save your retrieval date in records.
- Plan appointments around the estimate.
Retrieval as day zero
Egg retrieval is the moment sperm meets egg in the lab, which makes it a clean anchor for dating. Counting 266 days forward gives the expected birth, the same length as any full term pregnancy from conception. Because the day is known exactly, this estimate ranks among the most precise in medicine.
Your number also shows how far along you are today. Early weeks ask for rest, folate, and steady care. Watch the journey unfold with our Pregnancy Calculator, or check a transfer based date with the IVF Due Date Calculator.
From estimate to delivery
Babies set their own schedule, so expect arrival within a window around the date. A first scan confirms timing, and later visits follow growth. Lean on your clinic for medicine and milestones. For trusted background on IVF, see the Centers for Disease Control and Prevention.
Frequently Asked Questions
Both work. Retrieval marks fertilisation; transfer needs an embryo age adjustment.
Very precise, since fertilisation timing is known to the day.
An early ultrasound may move it slightly.
Scientific References
- American College of Obstetricians and Gynecologists. (2017). Estimating the due date. Committee Opinion 700.
- Society for Assisted Reproductive Technology. (2023). IVF cycle timeline.