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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.
Differences in Menstrual Blood Flow
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.
Period Calculator - Visual representation of a tool to estimate menstrual cycles, ovulation, and fertility for reproductive planning
Cycle tracking with an accurate period calculator can help you better understand your body and your health. Learn the benefits of using a period calculator and try it for free on WomanLog!