Our Menstrual Cycle Calendar and Period Tracker can help you anticipate your next period will start. You can make a list of your first day of each of your periods and how long they last. Then a one-year calendar will highlight the days when you’ve been on your periods, so you can see the trends in your menstrual cycle. The tracker will calculate the average number of days between cycles, as well as how long it typically last.
Menstrual cycle calendar
As you start to see the patterns in your cycles, you can record this when you think your future periods will start, and the calendar will shade dates as well (in a different color). When your period start, just update your prediction to match the real date.
Month-to-month variation may prevent you from predicting the exact date of your periods. Even so, tracking your cycles will help you guess the approximate date, and you will be less likely to be taken into surprise.
Menstrual cycle days
The menstrual cycle calendar is very straight and forward. You only need to input these three things: 1) the year you want the calendar to show, 2) the start date of each menstrual cycle and 3) the number of days your each period lasts.
Note: If you want to track your periods by hand, you can just print out the period tracker without any start dates. Then you can just color in the days you are on your period. After doing that, you can return to the spreadsheet and enter the dates and durations to calculate your average cycle.
Predicting future periods: When you know your average menstrual cycle length, you can use this template to create a calendar to show your future predictions. In the table to the right of the calendar (cell Y17), enter the start date of your last period. Then, to fill in the rest of the dates, in cell Y18 enter the formula =Y17+30 but replace 30 with your average cycle length (in days), and copy Y18 down to Y29.