Ovulation Calculator

What is Ovulation Calculator?

Enter your cycle length and last period date to see your predicted ovulation day and fertile window. Useful for conception planning or general cycle tracking.

How to use

1. Enter the first day of your last menstrual period.
2. Input your average cycle length in days (typically 21-35 days).
3. View your predicted ovulation date, fertile window, and next expected period across multiple upcoming cycles.

Result

Your last period started on March 1 with a 28-day cycle. Ovulation is predicted around March 15 (day 14). Your fertile window is March 12-17, and your next period is expected around March 29.

Related Tools