Cycle Length Calculator

Enter the first day of your last few menstrual periods to view your shortest and longest cycles and to calculate your average cycle length. The more dates you enter the more accurate the results will be.

Once you have your average cycle length you can use this number in the:

• Ovulation Calculator which can help you pinpoint when it is best to try to get pregnant by predicting your most fertile days
• Intercourse Timing Calculator to help find the best times to have intercourse when trying to get pregnant
• Pregnancy Test Timing Calculator to help you decide when to take your first home pregnancy test

Menstrual Cycle Start Dates: