Ovulation Calculator
Estimate when you're most likely to ovulate based on your last period and cycle length. Shows your fertile window - the days when conception is most likely.
Medical note
Ovulation timing varies person to person. This estimate assumes ovulation ~14 days before the next period. Use it for planning only.
Jun 21, 2026
Ovulation (est.)
Jun 16, 2026 – Jun 22, 2026
Fertile window
Jul 5, 2026
Next period (est.)
Next cycles (est.)
Cycle 2
Ovulation: Jul 19, 2026
Fertile: Jul 14, 2026 – Jul 20, 2026
Period: Jul 5, 2026
Cycle 3
Ovulation: Aug 16, 2026
Fertile: Aug 11, 2026 – Aug 17, 2026
Period: Aug 2, 2026
Cycle 4
Ovulation: Sep 13, 2026
Fertile: Sep 8, 2026 – Sep 14, 2026
Period: Aug 30, 2026
How to use
- Enter the first day of your last period.
- Enter your usual cycle length. If it varies, use your average.
- You'll see your estimated ovulation date and the fertile window around it.
Related tools: