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Period calculator

Use WomanLog's Period calculator to predict the next period days and to understand your menstrual cycle.

First day of your last menstrual period
How long did it last (days)?
Your average cycle length (days)
How long did it last (days)?
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Your average cycle length (days)
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WomanLog app – safe and private period tracker, does not share or sell user data
At WomanLog, your personal information is always private and secure. We never share or sell your data to third parties. Your privacy is our priority. You can also read an independent study that confirms this.
Balancing Act: The Intersection of Diet and Menstrual Wellness.
A woman's diet directly affects her hormones and menstrual cycle. Paying attention to what you eat can produce a more regular, less painful period, and a healthier state of mind.
Balancing Menstrual Health: Heavy Periods and Menorrhagia.
Far from pleasant—this is how most women would describe their periods—even though menstruation is a completely normal, natural, and more or less regular process. However, menorrhagic menstruation is abnormally heavy bleeding often accompanied by severe cramps.