Quantity Of Cement, Sand, Aggregates For 1000 sq ft Slab · Quantity Of Cement, Sand, Aggregates For 1000 sq ft Slab? To calculate the quantity of cement, sand, and aggregates required for a flat slab first we need to calculate the volume. Area of flat slab = 1000 =93 sq. m. The minimum thickness provided for slab is 150mm .