Ovulation
Calculator
Estimate ovulation dates, fertile windows, and best conception days based on menstrual cycle length.
Input
Current Cycle
Estimated Ovulation
May 18, 2026
Fertile Window
FertileMay 13, 2026 – May 18, 2026
Most Fertile Days
PeakMay 16, 2026 – May 18, 2026
Ovulation Day
OvulationMay 18, 2026
Next Period
PeriodJun 1, 2026
Luteal Phase Starts
May 19, 2026
How It Works
Ovulation typically occurs about 14 days before the start of your next period (the luteal phase). The fertile window spans 6 days: the 5 days before ovulation plus ovulation day itself.
The most fertile days are the 2 days before ovulation and ovulation day, when conception is most likely.
This calculator provides estimates based on average cycle patterns. Individual cycles may vary. Consult a healthcare provider for personalized fertility guidance.
Multi-Cycle Timeline
| Cycle | Ovulation | Fertile Window | Next Period |
|---|---|---|---|
| Cycle 1 | May 18, 2026 | May 13, 2026 – May 18, 2026 | Jun 1, 2026 |
| Cycle 2 | Jun 15, 2026 | Jun 10, 2026 – Jun 15, 2026 | Jun 29, 2026 |
| Cycle 3 | Jul 13, 2026 | Jul 8, 2026 – Jul 13, 2026 | Jul 27, 2026 |