Period Date Calculator

Has your period started on or been on your birthday, a major holiday, or any other of your special dates, and, if so, more than once? Calculate your period dates and find out! Calculator Usage FYIs below

Note: The period date calculator reviews your MyMonthlyCycles period tracker data. Member? Login and return here.

Not a member? Join now to use this free period report, period calendar, charts and more!

Calculator Usage FYIs: To calculate an exact date, enter month, day and year. For a specific day, such as New Year's, enter month and day only (e.g. January 1). For Period Start Day Only, enter Yes to check if your period started on that date; Or, Enter No to check if you had any period day on that date.

Planning a special date and want to know if you'll likely have your period? Check with the MyMonthlyCycles period predictor! (no login needed!)