Period Calculator by Rechnerzentrale

First day of your last period

Cycle length

From the first day of one period to the day before the next (21–45 days).

Period duration

days

Default: 5 days (2–10 days)

Irregular cycle? Earlier period start datesoptional, for an average

Previous period started on

Two periods before started on

Three periods before started on

Next period

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Please enter the first day of your last period.