About The Conception Calculator

Free calculators that answer one question well: when did, or when can, conception happen?

The Conception Calculator brings together 25 calculators for conception dates, due dates, ovulation, fertile windows, implantation, pregnancy tests and IVF due dates, available in 20 languages. Each one uses the standard rules for pregnancy dating used by doctors and midwives, and shows its results instantly in your browser.

How we calculate

Pregnancy is counted as 280 days from the first day of the last menstrual period. Conception is estimated at 266 days before the due date, ovulation at about 14 days before the next period, and the fertile window as the five days before ovulation plus ovulation day. IVF due dates are counted from the transfer date and embryo age.

Privacy by design

The calculators run entirely in your browser. We don't ask for accounts and we don't store the dates you enter.

Not medical advice

Our tools and articles are for general information. For anything about your own health, pregnancy or fertility, please speak to a doctor or midwife.

Contact

Email us at notictechsolution@gmail.com.