The typical menstrual cycle is around 28 days in length.
But everyone is different and menstrual cycles can vary by a few days from cycle to cycle.
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The first day of your current menstrual cycle (the first day you begin to bleed again) is also your last day of your previous cycle. The average length of the cycle is 28 days. The first day of your current menstrual cycle (the first day you begin to bleed again) is also your last day of your previous cycle. The average length of the cycle is 28 days.
The average is 28 days but it varies with each girl.
The first day of a womans menstrual cycle is also the first day of menstruation.
There are plenty of places online to find a menstrual cycle calculator. Tampax has a very nice menstrual cycle calculator. It is simple and easy to use.
28, I'm told, though in practice it seems to vary. 25-30 is probably a good bet.The average menstrual cycle length is 28 days - but there can be a lot of variation from one woman to the next, thus they can be shorter or longer.