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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
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Your average cycle length (days)
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Harmony in Flux: Navigating the Challenges of Irregular Periods.
The average menstrual cycle lasts 28 days. Our lives impact our hormones, and therefore our cycles—for example, stress can delay your period. Some variation is to be expected, but bigger fluctuations are reason to investigate.
Woman experiencing emotional symptoms of Premenstrual Dysphoric Disorder (PMDD) during menstrual cycle.
As hormone levels begin to drop after ovulation, most women experience some changes in their physical and mental state such as tender breasts, bloating, or moodiness. Such symptoms are often linked with Premenstrual Syndrome, or PMS. For those of us who suffer from Premenstrual Dysphoric Disorder, or PDD, the symptoms—especially those having to do with emotions—are noticeably more severe.
Fertility Exploration: Understanding the Impact of Polycystic Ovary Syndrome (PCOS) on Reproductive Health.
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.