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1 Record the number of days in each cycle, including the day you start your period. 2  The last day of each cycle is the day before your next period starts. 3  Keep tracking your cycle this way for eight to twelve cycles. 4  The more cycles you have to reference, the more accurate the calendar method will be.
body through the vagina. Most menstrual periods last from three to five days. A menstrual cycle is counted from the first day of one menstrual period to the first day of the next period. How to calculate your next menstrual cycle period:The average menstrual cycle is 28 days long.Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens. An estimated menstrual cycle period can be calculated by following steps 1 through 3:1.You need to determine the first day of your last menstrual period. 2. Knowing your menstrual cycle length. This is the number of days from the first day of your period until the last day before your next period.3.Enter the date and menstrual cycle length, Click the button, You'll get the calculation..You need to determine the first day of your last menstrual period. 2. Knowing your menstrual cycle length. This is the number of days from the first day of your period until the last day before your next period. 3.Enter the date and menstrual cycle length, Click the button, You'll get the calculation.