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Ovulation Calculator

Find your most fertile window and likely ovulation day based on your menstrual cycle length.

Ovulation Calculator

Calculate your fertile window and ovulation day.

First Day of Last Period

Average Cycle Length (days)

Luteal Phase Length (days)

ℹ️ Understanding Your Cycle

Follicular Phase: Day 1 to ovulation
Ovulation: Usually 14 days before next period
Fertile Window: 5 days before + day of ovulation
Luteal Phase: Ovulation to next period (default 14 days)
Sperm can survive up to 5 days inside the body
An egg is viable for 12-24 hours after release