A ovulation calculator assists in predicting your peak fertile days according to your menstrual cycle. Here’s a straightforward method to make an estimation:

Monitor Your Cycle Length: Measure the number of days from the onset of one period to the onset of the subsequent period. This is your cycle length.

Identify Your Fertile Period: Ovulation generally happens 14 days prior to the beginning of your following period.

For instance, if your cycle is 28 days long, you can expect ovulation approximately on Day 14. Your fertile period would range from Day 10 to Day 15.
Utilize an Ovulation Calculator Tool:

Input the start date of your last period and your average cycle length.
Numerous calculators will provide an estimate of your fertile days and the date of your upcoming ovulation.