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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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Unlocking Insights: Visual Guide to 5 Reasons to Track Your Cycle with WomanLog
Mobile period trackers have revolutionized access to data-driven knowledge about the female reproductive cycle. Not long ago, all we had was a calendar, a pen, and our own questions. Now, period trackers make it possible to record the daily progress of your menstrual cycle and the symptoms you experience, pinpoint ovulation, predict when your next period will start, help you get pregnant or avoid pregnancy, and much more—all in one simple app on your phone.
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!
Untangling Delays: Exploring Reasons Behind a Late Period.
A regular period is a sign of overall good health. If it doesn’t arrive when it should, we worry. Most women experience some variability in their menstrual cycles. How familiar are you with yours?