How to Count Menstrual Periods

There are several reasons why it is important to know the numerical breakdown of your menstruation cycle. One reason is that knowing whether your period is regular or not can be a clue as to your internal health. If your period is irregular, your doctor or gynecologist will need to know, especially if you have other related issues. Another reason to count the days of your cycle is that you may be trying to get pregnant, and knowing when you are ovulating is key. Many women are unaware of how to properly count their cycle, but in truth, it is a simple process that any woman of any age can do.

Things You'll Need

• Calendar
• Pen
• Computer with internet access

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Instructions

• 1

  Mark on your calendar the first day of your period. Make sure that this is the date that you first start bleeding, not when you start experiencing cramps or PMS.

• 2

  Check off each day of your period until the bleeding stops. You can choose to mark them any way you wish, whether it be with a dot, check mark or stickers.

• 3

  Wait until your next period starts. Mark this date as well; then mark the days of your flow.

• 4

  Count the number of days from the first day of one period to the first day of the next period. The number you come up with is your menstrual-cycle length.

• 5

  Keep up with marking your periods on your calendar for a while. Count each cycle length. Eventually, you will notice a pattern and have your average cycle length, which for most women is about 28 days.

• 6

  Use an internet site that will calculate these numbers for you, if you don't want to mark a calendar. Sign up for an account after finding a site, such as the one in References. Input the start date for your period each time your have a period. The website will count your cycle length for you and inform you of probable ovulation times.