Ovulation
Calculator
Estimate ovulation dates, fertile windows, and best conception days based on menstrual cycle length.
Input
Current Cycle
Estimated Ovulation
Nov 18, 2026
Fertile Window
FertileNov 13, 2026 – Nov 18, 2026
Most Fertile Days
PeakNov 16, 2026 – Nov 18, 2026
Ovulation Day
OvulationNov 18, 2026
Next Period
PeriodDec 2, 2026
Luteal Phase Starts
Nov 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 | Nov 18, 2026 | Nov 13, 2026 – Nov 18, 2026 | Dec 2, 2026 |
| Cycle 2 | Dec 16, 2026 | Dec 11, 2026 – Dec 16, 2026 | Dec 30, 2026 |
| Cycle 3 | Jan 13, 2027 | Jan 8, 2027 – Jan 13, 2027 | Jan 27, 2027 |