ToolPronto
Ovulation calculator
Estimate the next period, ovulation date and a broad fertile window from an average cycle.
Ovulation calculator
Estimate the next period, ovulation date and a broad fertile window from an average cycle.
Your entries stay in this browser and are never included in analytics.
Estimated ovulation
- Fertile window starts
- July 10, 2026
- Fertile window ends
- July 15, 2026
- Estimated next period
- July 29, 2026
How it was calculated
2026-07-01 + 28 d − 14 dOvulation calculator
Estimate the next period, ovulation date and a broad fertile window from an average cycle. Your entries stay in this browser and are never included in analytics. Calendar estimates are not infallible, do not confirm ovulation and must not be used as contraception.
Ovulation calculator — How it was calculated
- Estimate a calendar-based fertile window from recent cycle dates.
- Plan when to record symptoms or use a separate ovulation test.
- Preview another cycle without using the estimate as contraception.
How it was calculated
- Estimate the next period, ovulation date and a broad fertile window from an average cycle.
- Your entries stay in this browser and are never included in analytics.
- Calendar estimates are not infallible, do not confirm ovulation and must not be used as contraception.