There are many ways to predict ovulation, but the most common and simplest method is to use a calculator. Here's how to use a simple calculator to estimate ovulation.

Next, enter your period and birth date into the calculator. The calculator will calculate your likely ovulation dates for you.

Here's a step-by-step guide to using a simple calculator to calculate ovulation:

1. Enter your period and date of birth.

2. Select the "Female" tab.

3. Enter your period in the Period field.

5. Select the Calculation tab.

6. The calculator will calculate possible ovulation dates for you.

Please note that this method is just a simple calculation method and cannot be guaranteed to be 100% accurate. If you want a more accurate estimate of ovulation, it's best to consult a doctor or a professional calendar app.