Ovulation
Calculator
Estimate ovulation dates, fertile windows, and best conception days based on menstrual cycle length.
Input
Current Cycle
Estimated Ovulation
Oct 4, 2026
Fertile Window
FertileSep 29, 2026 – Oct 4, 2026
Most Fertile Days
PeakOct 2, 2026 – Oct 4, 2026
Ovulation Day
OvulationOct 4, 2026
Next Period
PeriodOct 18, 2026
Luteal Phase Starts
Oct 5, 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 | Oct 4, 2026 | Sep 29, 2026 – Oct 4, 2026 | Oct 18, 2026 |
| Cycle 2 | Nov 1, 2026 | Oct 27, 2026 – Nov 1, 2026 | Nov 15, 2026 |
| Cycle 3 | Nov 29, 2026 | Nov 24, 2026 – Nov 29, 2026 | Dec 13, 2026 |