Figure out which type best suits your needs and wishes. [substeps] Buy a paper calendar with plenty of space to make notes if you want to document your cycle by hand.
[header] How to keep a menstrual calendar [title] Get a calendar suitable to your needs. [step] There are currently many different calendar options to track your cycle. You can choose to keep a physical calendar or journal or take advantage of any number of online tools or smartphone apps to track your menstrual cycle.