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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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Unraveling the Menstrual Cycle Timeline: Understanding Duration and Phases.
There is quite a lot of variability in the menstrual cycle. The average cycle is 28 days long, but anything from 21 to 35 days is considered normal. Tracking your menstrual cycles can help you understand what is normal for you. This will also help you notice irregularities, such as a delayed or missed period, or spotting.
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.
Sleeping peacefully during menstruation: Strategies to tackle insomnia and fatigue.
Feeling exhausted when your period starts? You are not alone. Lack of energy just before and during menstruation is very common. Many women feel sleepy and lethargic during that time of month. To live through this phase of the menstrual cycle more serenely it is important to understand what is happening in your body and to take good care of yourself. Finding the right solution for menstrual insomnia means solving a great contradiction: what exhausts you during the day, prevents you from sleeping at night.