Timing intercourse during the fertile window maximizes your chances of conception.
⚠This calculator provides estimates only. For personalized fertility advice, please consult a healthcare provider or fertility specialist.
Understanding Your Cycle
A typical menstrual cycle has two phases: follicular (before ovulation) and luteal (after ovulation). The luteal phase is usually consistent at 12-16 days.
Follicular Phase
Variable length
From LMP to ovulation. Egg matures in ovary.
Luteal Phase
12-16 days (usually 14)
From ovulation to next period. Consistent length.
Example: 28-day cycle, LMP = Jan 1. Ovulation ≈ Jan 15. Fertile window = Jan 10-15. Next period ≈ Jan 29.
Applications
Family PlanningConceptionFertility TrackingCycle AwarenessNatural Family Planning
Frequently Asked Questions
When is the fertile window?▼
The fertile window is typically 5 days before ovulation plus the day of ovulation (total 6 days). Sperm can live 3-5 days, egg lives 12-24 hours.
How to calculate ovulation date?▼
For regular cycles: ovulation = LMP + (cycle length - 14). Most women ovulate 12-16 days before next period. Day 14 is average for 28-day cycle.
What are signs of ovulation?▼
Signs include: egg-white cervical mucus, increased libido, mild pelvic pain (mittelschmerz), slight temperature rise, and positive ovulation test.
How accurate are ovulation calculators?▼
Calculators are estimates based on averages. Use with ovulation tests, cervical mucus tracking, or basal body temperature for best accuracy.
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