Period Calculator

First day of your last period:
Enter the first day of your menstrual period, also known as the start to your menstrual cycle.

Average cycle length (in days):
A full menstrual cycle refers to the length of time from the beginning of one period to the first day of the next period. For example: If your last period started on January 1st and your next period started on February 2nd, your menstrual cycle length would be 33 days.

How long did it last (in days):
This refers to the duration of time spent bleeding or the number of days that you experienced vaginal bleeding during your cycle. It can be measured from the first day you notice bleeding through the day bleeding stops.

Next Period Information

Menstruation Start Date:

Menstruation End Date:

Most Probable Ovulation Days:

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