Ovulation Calculator
Calculate your ovulation date and fertility window
Last Menstrual Period
Cycle Information
days
days
Calculation Options
Your Ovulation Results
Based on your cycle information
January 29, 2024
Fertile Window: January 24 - January 30, 2024
Next Period: February 12, 2024
Current Cycle Fertility Window
Cycle Calendar
Showing next 3 cycles
| Cycle | Period Start | Ovulation Date | Fertile Window | Next Period |
|---|
About Ovulation Calculation
Ovulation is the process when a mature egg is released from the ovary, ready to be fertilized. This typically occurs about 14 days before your next period starts. The fertile window includes the 5 days before ovulation and the day of ovulation itself.
Menstrual Cycle Phases
| Phase | Days | Description | Fertility |
|---|---|---|---|
| Menstrual Phase | 1-5 | Period bleeding, uterine lining sheds | Low |
| Follicular Phase | 6-13 | Follicles develop in ovaries | Low to Medium |
| Ovulation Phase | 14 | Egg released from ovary | Peak |
| Luteal Phase | 15-28 | Uterine lining prepares for pregnancy | Low |
Fertility Window Guide
| Days Before Ovulation | Fertility Level | Chance of Pregnancy | Recommendation |
|---|---|---|---|
| 5-3 days before | High | 20-30% | Good time to conceive |
| 2-1 days before | Peak | 25-35% | Best time to conceive |
| Day of ovulation | Peak | 30-40% | Optimal time to conceive |
| 1 day after | High | 10-20% | Still good chance |
| 2+ days after | Low | 0-5% | Very low chance |
Understanding Your Cycle
- Cycle Length: Number of days from the first day of your period to the day before your next period starts (typically 21-35 days)
- Luteal Phase: Time between ovulation and the start of your next period (typically 12-16 days, usually 14 days)
- Ovulation: Usually occurs about 14 days before your next period starts
- Fertile Window: 5 days before ovulation through the day of ovulation (sperm can live up to 5 days)
- Egg Viability: An egg is viable for about 12-24 hours after ovulation
Important Notes
- These calculations provide estimates - actual ovulation may vary
- Cycle length can vary from month to month
- Stress, illness, travel, and other factors can affect ovulation timing
- For accurate ovulation prediction, consider using ovulation predictor kits or tracking basal body temperature
- If you have irregular cycles, consult with a healthcare provider