Ovulation Calculator
Estimated ovulation and fertile window.
Result
Estimated ovulation
Sun, Oct 25, 2026
- Fertile window starts
- Tue, Oct 20, 2026
- Fertile window ends
- Mon, Oct 26, 2026
- Next period
- Sun, Nov 8, 2026
Common questions
When do I ovulate?
Ovulation typically occurs about 14 days before your next period starts. For a 28-day cycle, that is around day 14. The calculator estimates your fertile window based on your cycle length.
What is the fertile window?
The fertile window is roughly 6 days: the 5 days before ovulation and the day of ovulation itself. Sperm can survive up to 5 days, so conception can occur from intercourse before ovulation.