Conception Calculator

Find your most fertile days to increase chances of conception.

First Day of Last Period

Cycle Length (days)

Most Fertile Window

Estimated Ovulation

What is this Online Conception Calculator for?

The Conception Calculator helps you identify your "fertile window"—the days in your menstrual cycle when you are most likely to get pregnant.

How does it work?

It estimates the date of ovulation (usually 14 days before your next period) and highlights the 6-day window leading up to and including that day, which is the prime time for conception.