Ovulation Calculator

Estimate your fertile window and likely ovulation day.

First Day of Last Period

Average Cycle Length (days)

Estimated Ovulation Day

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Most fertile window	—
Next period (approx)	—

How it works

Ovulation typically occurs about 14 days before your next period. The fertile window spans roughly the five days before ovulation plus the ovulation day itself. This is an estimate based on a regular cycle — actual timing varies. For medical guidance, consult a professional.