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Menstrual Period Length Stats Study


How long does the typical menstrual period last?

We analyzed the duration of menstrual periods of roughly 19000 fertility/ovulation charts on

This statistical study counted the days of consecutive bleeding or spotting at the start of each cycle.


Statistical Summary

The descriptive stats for this sample are:

Sample Size:19933 Charts.
Average:5.15 Days.
Median:5 Days.
Standard Deviation:1.71.


We found that 66% of the sample's charts include one or more days of spotting mostly at the end of the period. Further analysis showed that the median number of days of spotting is 1 day.

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