Implantation window calculator
Estimate when an embryo is most likely to implant after ovulation, IUI or an embryo transfer, when a pregnancy test becomes informative, and the estimated due date if pregnancy results. These are typical timings, not a prediction for any one person, and they cannot tell you whether you are pregnant.
Counted from day one of one period to day one of the next.
Use the day you ovulated, from an ovulation test, temperature tracking or ultrasound, or the day of your IUI, which is timed close to ovulation. If you use an ovulation test, the surge day is usually 1 to 2 days before ovulation.
Calculated in your browser. Your details are not saved or sent anywhere.
Choose a starting point, enter the date and select Calculate to see your implantation window, a day-by-day timeline and test dates here.
Your estimated implantation window
Day by day
If this results in a pregnancy
These dates apply only if this cycle or transfer results in a pregnancy. Your first ultrasound may adjust the due date.
Before you rely on these dates
Implantation dates here are typical timings. They are not a diagnosis, they cannot tell you whether an embryo has implanted, and they do not replace the instructions from your fertility clinic.
Your clinic decides your medicine schedule and the date of your pregnancy blood test, so please follow its advice over any calculator. Please do not start, stop or change a medicine because of a calculator result. The wait can be hard, and it is normal to feel anxious. Support is available from your clinic, a counsellor or someone you trust. If you have severe pain, heavy bleeding or any urgent symptom, contact your own doctor or emergency services.
