Online Fertile Window Calculator

Pregnancy is most likely to happen when unprotected sex occurs during the fertile window. The fertile period is a series of days that occur about halfway through your menstrual cycle.

This calculator is able to calculate your fertile window by evaluating the first day of your last period and your cycle length. It is particularly accurate if your cycles are regular.

In addition to using this calculator, women with irregular menstrual cycles can also opt to do ovulation tests to know when they are ovulating. These can be purchased at the pharmacy.