Fertile Window Calculator

Average Menstrual Cycle Length (days):

Average Menstrual Cycle Length (days):

Please enter a cycle length between 21 and 45 days.

First Day of Last Period:

Please select the first day of your last period.

Your Fertility Information

Based on a -day cycle:

Your fertile window is approximately:

Your ovulation day is estimated to be:

Next period is expected around:

Disclaimer: This calculator provides an estimate based on average cycle patterns. Every woman’s body is unique, and many factors can affect your cycle and fertility. For accurate family planning or conception assistance, please consult with a healthcare provider.