Period Calculator - Version 1.0.0 Period Calculator is a software utility for keeping track of women's menstrual cycle or periods. With Period Calculator, it has never been easier to manage your menstrual cycle records and tell your cycle status! Know your periods, and take control over yourself now. Major features: 1) Keeping track of menstrual cycle; 2) Making predications; 3) Export and import period logs; 4) Customize parameters.