Fiqh Measures & Kurr
The measures the rulings run on — kurr water, mudd and sa', the travel distance, mithqal and dirham — in modern units, with a kurr checker for your tank.
Is my water kurr?
Enter your container's inner dimensions, or the volume directly.
— or by dimensions —
Kurr water is not made impure by mere contact with najasa (about 384 litres by the widely adopted value; estimates vary somewhat between scholars). Lesser (qalil) water is. Confirm the value your marja' adopts.
Common measures
- Kurr (water)
- ≈ 384 litres
- Used for:Water at or above kurr is not made najis by mere contact
- Mudd
- ≈ 750 g
- Used for:Kaffarah & fidya — the food of one poor person
- Sa'
- 4 mudd ≈ 3 kg
- Used for:Zakat al-fitra — one sa' of staple food per person
- Farsakh
- ≈ 5.5 km
- Used for:The unit of the shar'i travel distance
- Masafa (travel distance)
- 8 farsakh ≈ 44 km
- Used for:The traveler's threshold — qasr prayer and breaking the fast
- Mithqal (shar'i)
- 3.456 g
- Used for:Gold zakat nisab: 20 mithqal ≈ 69.12 g
- Mithqal (sayrafi)
- 4.608 g
- Used for:The common bazaar mithqal — 4:3 ratio to the shar'i (the shar'i is ¾ of it)
- Dirham (silver)
- ≈ 2.42 g silver
- Used for:Mahr al-Sunnah = 500 dirhams ≈ 1,210 g of silver
- Silver zakat nisab
- 200 dirhams ≈ 484 g
- Used for:Zakat falls due on minted silver at this threshold
Figures follow the widely used equivalences in current risalahs; marja' offices publish exact values — confirm with your marja'.