Choose your halachic observance options If not sure consult with your Rabbi
Important MikvahKal calculates menstrual patterns based on dates. However, sometimes a pattern can be established based on recurring physical symptoms that accompany the onset of periods (Veset HaGuf). If you think this might apply to you, a competent Rabbi should be consulted.
Earliest Hefsek Tahara
Onah Beinonit (Average Cycle) Day
Onah Beinonit (Average Cycle) Length
30th day hachodesh onat prisha (hebrew date period antecipation) in a 29 day month
A short interval uproots a longer one
Or zarua
Haflaga (interval) calculated by
Patterns
HaHaflaga
BeDilug incresing
BeDilug decreasing
BeDilug Chozer
HaChodesh
BeDilug
BeSirug
BeDilug Chozer
BeDilug Onot
HaShavua
BeSirug
Rosh Chodesh
Imei Mevuchah
Third period MeMa'ayan Patuach
On continuous flow (Shofa'at)
On interrupted flow (Hefsik'a)
Mikvah night on Tisha B'Av that falls on Shabbat
Woman with a fixed cycle
Beinonit for a short interval of less than 30 days
Pregnant on the first trimester
Uprooting a fixed cycle
Pregnant after first trimester
Onah Beinonit
After birth (Meianeket)
Until when does she have the status of a Meianeket
Establishing a fixed pattern
After 24 months from birth
Pattern (not fixed) from before the siluk damim
Fixed pattern from before the siluk damim
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