Ovulation
Calculator

Estimate ovulation dates, fertile windows, and best conception days based on menstrual cycle length.

Input

Current Cycle

Estimated Ovulation

Oct 27, 2026

Fertile Window
FertileOct 22, 2026 – Oct 27, 2026
Most Fertile Days
PeakOct 25, 2026 – Oct 27, 2026
Ovulation Day
OvulationOct 27, 2026
Next Period
PeriodNov 10, 2026
Luteal Phase Starts
Oct 28, 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

CycleOvulationFertile WindowNext Period
Cycle 1Oct 27, 2026Oct 22, 2026 – Oct 27, 2026Nov 10, 2026
Cycle 2Nov 24, 2026Nov 19, 2026 – Nov 24, 2026Dec 8, 2026
Cycle 3Dec 22, 2026Dec 17, 2026 – Dec 22, 2026Jan 5, 2027

Learn more

How do cycle trackers predict ovulation, and why do cycle lengths vary?

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Frequently Asked Questions

Ovulation typically occurs 14 days before the start of the next menstrual period. For a 28-day cycle, ovulation falls around day 14; for longer or shorter cycles, the date shifts accordingly.

The fertile window spans the 5 days before ovulation and the day of ovulation itself, totaling approximately 6 days when conception is possible. Sperm can survive in the reproductive tract for up to 5 days.

Ovulation calculators provide estimates based on average cycle length and are most accurate for people with regular cycles. Irregular cycles, stress, illness, and hormonal changes can shift the actual ovulation date.

Ovulation Calculator - Fertile Window Estimator | ToolsCanvas