A brass is a traditional Indian unit of volume used for measuring and selling bulk construction materials like sand and aggregate. One brass equals 100 cubic feet, which is about 2.83 cubic metres. The term comes from the old practice of measuring a stack 10 ft × 10 ft × 1 ft.
Suppliers in much of India quote sand and aggregate prices per brass, and a tractor or truck load is often described in brass. Because it is a volume unit, the actual weight in a brass depends on the material's bulk density — roughly 4.3 tonnes of sand or 4.2 tonnes of aggregate per brass, though this varies with moisture and grading.
When estimating, it helps to convert between units: 1 m³ = 35.31 cft = 0.353 brass. So if a calculation gives 2 m³ of sand, that is about 0.71 brass to order. Knowing the local unit your supplier uses — brass, cubic feet or tonnes — avoids costly ordering mistakes.