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Free Period Calculator & Online Period Tracker - Calculate your next period, predict ovulation, and track your menstrual cycle. Best web-based period tracker with no account required. Using a period-tracking app like Flo can keep a handy record of your previous periods, your cycle length, and how long menstruation typically lasts for you. You can also track your cycle using a pen and paper calendar. Track your period, predict your cycle, and monitor symptoms with Lunaal's free online period tracker and calculator. Gain valuable insights into your menstrual health. The menstrual cycle safe period calculator or tracker takes insights from users like the foremost day of your last period (LMP) and the length of your menstrual cycle to better estimate your subsequent due period, along with predicting your fertility, ovulation and safe days.