Conception Date Calculator
Curious when conception likely happened? Work backwards from a due date or your baby's birth date to estimate the date, and the window around it.
Work it out from…
Estimated conception date
Conception most likely happened between and .
The dates behind it
| Conception window opens | |
| Most likely conception | |
| Conception window closes | |
| Approx. last period before |
This assumes a typical 40-week pregnancy. Conception is counted about two weeks after the last period, which is why the dates line up this way.
Next step
Map Out My Pregnancy
Now see your whole pregnancy, week by week.