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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.
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Menstruation, by definition, comes with flow—the cyclical discharge of the uterine lining. Just like is says on the packaging of feminine hygiene products, your flow can be light, heavy, or “normal.” But normal will be different for different bodies.
Empowering Choices: Visualizing the Decision - To Bleed or Not to Bleed?
The average woman spends roughly six years of her life menstruating. Most of us just accept this as part of life, but it would be really nice not to have to worry about it.