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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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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.
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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.
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Polycystic ovary syndrome (PCOS) is a group of symptoms, or “syndrome”, that affects the ovaries and ovulation. It is common in women of reproductive age. Women with PCOS produce higher-than-normal levels of androgens (male hormones). This hormone imbalance disturbs the menstrual cycle—infrequent or prolonged periods; and the ovaries may develop numerous follicles (small sacs of fluid that produce hormones and influence fertility) and fail to release eggs regularly, which makes it difficult to get pregnant. An accurate and early diagnosis makes it easier to get the proper treatment to manage symptoms.