Ovulation Calculator

Free Online Ovulation Calculator

The BabyHopes free ovulation calculator will help you find out when you are most fertile during your menstrual cycle. For most women, ovulation occurs approximately 14 days before the start of your next menstrual period. Knowing when you ovulate will help you have sex at a time that will increase your chances of getting pregnant.

Before starting, you need to know this about our ovulation calculator:

  • Cycle lengths of more than 35 days are too long for appropriate calculations.

  • Cycle lengths of less than 21 days are too short for appropriate calculations.

  • Our calendar cannot be used to reliably prevent pregnancy.

If your menstrual cycle is too short or long, of if you have very irregular cycles, you may want to consider trying a natural fertility supplement to help balance your hormones and encourage regular ovulation.

The your cycle length is calculated by counting the number of days from the first day of menstruation to the day before the following menstrual period starts.

Calculate Your Cycle Length To Use This Ovulation Calculator

If you don't want to manually count the days on a calendar, you can just click here and enter the dates and we will automatically calculate your cycle length for you.

First day of last menstrual period:
Length of cycle: days
Show me my most fertile days for: Months
Show me the best days to have sex in order to increase my
chances of having a baby girl or baby boy

Scroll down to see your most fertile days!

To print your calendar, first click 'Plan It!',
then click 'Print It!'