Ovulation
Calculator
Estimate ovulation dates, fertile windows, and best conception days based on menstrual cycle length.
Input
Current Cycle
Estimated Ovulation
Aug 18, 2026
Fertile Window
FertileAug 13, 2026 – Aug 18, 2026
Most Fertile Days
PeakAug 16, 2026 – Aug 18, 2026
Ovulation Day
OvulationAug 18, 2026
Next Period
PeriodSep 1, 2026
Luteal Phase Starts
Aug 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 | Aug 18, 2026 | Aug 13, 2026 – Aug 18, 2026 | Sep 1, 2026 |
| Cycle 2 | Sep 15, 2026 | Sep 10, 2026 – Sep 15, 2026 | Sep 29, 2026 |
| Cycle 3 | Oct 13, 2026 | Oct 8, 2026 – Oct 13, 2026 | Oct 27, 2026 |