Ovulation Calculator

About the Ovulation Calculator

The ovulation calculator estimates your most fertile days based on your menstrual cycle information. Knowing your fertile window can help you plan or prevent pregnancy by identifying the days when you're most likely to conceive.

How Ovulation Works

Ovulation is 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 egg survives for 12-24 hours after ovulation, while sperm can live for 3-5 days in the female reproductive tract. This creates a "fertile window" of about 5-6 days each cycle.

How to Calculate Your Fertile Days

To estimate your fertile window:

1. Track your menstrual cycle length (from day 1 of your period to day 1 of your next period)
2. Subtract the length of your luteal phase (typically 14 days) from your cycle length to estimate ovulation day
3. Your fertile window is the 5 days before ovulation and the day of ovulation itself

Factors That Can Affect Ovulation

Several factors can influence your menstrual cycle and ovulation:

• Stress: High stress levels can delay ovulation or cause anovulatory cycles
• Weight changes: Significant weight loss or gain can affect hormone levels
• Exercise: Extreme physical activity can disrupt menstrual cycles
• Medical conditions: PCOS, thyroid disorders, and other conditions can affect ovulation
• Age: Cycle regularity often changes as you approach menopause

Signs of Ovulation

In addition to tracking your cycle, you may notice physical signs of ovulation:

• Cervical mucus changes: Becomes clear, stretchy, and egg-white like
• Basal body temperature: Rises slightly after ovulation
• Mittelschmerz: Mild pelvic or lower abdominal pain on one side
• Libido changes: Increased sex drive around ovulation