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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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Image depicting preparation for your first period
When will I get my first period? What are the signs? How will I know? Am I the right age? These questions are important, and the answers will help you prepare for menstruation. In this article, you’ll learn why periods happen in the first place, how to prepare for your first menstruation, and how to talk to your parents about it.
Visualizing Influence: The Impact of Hormones During the Menstrual Cycle.
Reproductive-age women experience a menstrual cycle roughly every month. This cyclical process is connected to all the other systems that keep our bodies running and support our capacity for reproduction. The menstrual cycle is sensitive to the other changes that occur in our lives—environmental, emotional, or other.
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For many people, weight fluctuation can be a source of frustration. Understanding the reasons for these changes can lessen that frustration.