Ovulation Calculator

Ovulation Calculator helps you to find the most fertile days based on the first day of your last period and menstrual cycle length.

Select the first day of your last period:

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Average length of cycle:

Fertile days are:

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Estimated due date: {{ dueDate }}

About Ovulation Calculator

Are you planning to get pregnant? Knowing the ovulation time increases the chances of conceiving. If your period cycle is regular then try our Ovulation Calculator to determine which dates are most likely to be fertile.

Note: Our tool is just for educational purposes and provides the estimation of the fertile window. There is no guarantee of birth control or pregnancy. Also, the information on our website is not medical advice. It's better to take a pregnancy consultation with your doctor that works for you.

Ovulation Calculator

What is Ovulation?

Ovulation is a moment when a mature egg is released from the ovary and travels down to the fallopian tube. It stays there for 12 to 24 hours and waits for sperm to be fertile. Most probably, it happens once a month on the 14th day of 28 days menstrual cycle.

How to use Ovulation Calculator?

  1. Firstly, select the first day of your last period on the calendar.
  2. Next step is to select the average length of your menstrual cycle. On average, it's 28 days long. But it varies for each woman.
  3. To see the final result, just click on the "Calculate" button. That's all.
  4. As a result, our tool will show the most fertile days and estimated due date on your screen.
  5. Lastly, you can press the "Start Over" button for a new calculation.