Free Tool

Ovulation Calculator

Find your most fertile days, ovulation window and best conception dates based on your menstrual cycle. Private — all calculations run in your browser.

Your Cycle Details

First Day of Last Period

Cycle Length (days)

Period Duration (days)

Cycles to Display

Your Fertile Window

Day-by-Day Calendar

Medical Disclaimer: This calculator provides estimates based on average cycle patterns. Actual ovulation dates vary. For family planning or fertility concerns, consult a qualified healthcare provider.

Enter your cycle details and click
Calculate Fertile Window