Hayd or istihada?
Tap the days you bled. The classifier applies A. Sistani's duration rules.
Nothing you enter leaves your browser. This is a teaching aid, not a fatwā.
14 days starting from your chosen date. Pink = bled.
Educational tool. For your own situation, follow your marja's office.
The rulings
Ruling 438 Hayd duration: 3 to 10 days
Ḥayḍ cannot last for less than three days or more than ten days; if bleeding lasts for even a little less than three days, it is not ḥayḍ.
sistani.org →Ruling 439 First three days of hayd must be continuous
The first three days of ḥayḍ must be continuous; therefore, 46 A sayyidah is a female descendant of Hāshim, the great grandfather of Prophet Muḥammad (Ṣ). 47 This is explained in Ruling 468. if, for example, a woman experiences bleeding for two days, and then the bleeding stops for one day, and then she experiences bleeding again for one day, it is not ḥayḍ.
sistani.org →Ruling 492 Ten clear days separate two distinct hayds
If a woman who usually experiences bleeding once a month experiences bleeding twice in one month, then in the event that the number of days on which her bleeding stops in between is not less than ten, she must consider both bleedings to be ḥayḍ even if one of them does not have the attributes of ḥayḍ.
sistani.org →What this tool does not cover
Nifas (postpartum), istihada tier classification (qalīla / mutawassiṭa / kathīra), menarche and menopause gates, istibra, retroactive partition by visual signs, and family-pattern fallback all live in the app, not here.