Ovulation Calculator

Find your fertile window

First Day of Last Period

Cycle Length (days)

Period Length (days)

Estimated Ovulation Date--

Fertile Window--

Next Period--

Pregnancy Test Day--

Understanding Your Cycle

Ovulation typically occurs 14 days before your next period. Your fertile window is the 5 days before and 1 day after ovulation. Sperm can survive up to 5 days, but the egg lives only 24 hours.