Ovulation Calculator – Predict Your Fertile Days Easily

Your Fertility Window

Event Date Description
About Ovulation Tracking

Tracking your ovulation can help with family planning, whether you're trying to conceive or avoid pregnancy. The fertile window typically includes 5 days before ovulation plus the day of ovulation.


The Ovulation Calculator helps you track your menstrual cycle and predict your most fertile days. This tool is especially helpful for women trying to conceive naturally, as it estimates your ovulation date and your fertile window.

What is Ovulation?

Ovulation is when your ovary releases an egg, usually around the middle of your menstrual cycle. This egg stays alive for about 12 to 24 hours. If sperm is present during this time, fertilization is most likely to happen.

How the Ovulation Calculator Works

Our calculator uses the first day of your last period and your average cycle length to estimate your ovulation day and fertile window. It assumes a regular cycle and calculates backwards from your expected next period.

Ovulation usually occurs about 14 days before your next period begins.

Why Use This Calculator?

  • Helps with pregnancy planning
  • Shows your most fertile days
  • Gives a clear estimate of ovulation timing
  • Natural and free fertility tracking

How to Use It

Just enter:

  • The first day of your last menstrual period
  • Your average cycle length (typically 28 to 32 days)

The calculator then shows your ovulation day and your 6-day fertile window.

Example

If your last period started on April 1st and your cycle length is 28 days, your estimated ovulation day would be April 15th. Your fertile window would be from April 10th to April 15th.

Important Tips

  • Track multiple cycles for better accuracy
  • Combine with body signs like basal temperature or cervical mucus
  • This calculator is not a birth control method

Final Thoughts

The Ovulation Calculator is a simple tool to better understand your cycle and plan for pregnancy. While it gives a good estimate, every woman’s cycle is different. For best results, use it along with natural fertility signs or consult a doctor if needed.