Fertility Window Calculator
Find your most fertile days to maximize your chances of conception.
Normal cycle length is typically 21-35 days
Enter your cycle information to find fertile days
This calculator provides estimates based on average cycle patterns. Actual fertility windows may vary. For irregular cycles, fertility concerns, or if you've been trying to conceive for 6+ months (if over 35) or 12+ months (if under 35), consult with Dr. Geeta S K for personalized fertility evaluation and guidance.
Understanding your fertility window
Most fertile days
2-3 days before ovulation when conception chances are highest
Fertility window
6-day period including 5 days before and the day of ovulation
Ovulation day
When the mature egg is released from the ovary
Fertility facts
- Egg lifespan: 12-24 hours after ovulation
- Sperm lifespan: up to 5 days in the reproductive tract
- Conception window: 6 days maximum per cycle
- Peak fertility: the day before ovulation
- Cycle variations: normal range 21-35 days
- Luteal phase: typically 12-16 days after ovulation
Talk through your fertility questions
Dr. Geeta S K can talk you through what your cycle is showing, which tests are worth doing, and what the realistic next step is.
Book a fertility consultation