Stone & Aggregate Freight Class Calculator

Stone and aggregate products encompass crushed limestone, granite, basalt, marble, sandstone, and other dimensional and crushed stone products. Quarrying operations produce both commodity crushed stone for construction and dimensional stone blocks and slabs for architectural applications. The construction and landscaping industries consume enormous quantities of crushed stone — roughly 1.4 billion tons annually in the US — while the architectural stone market moves smaller volumes at much higher values.

Stone density is among the highest of any freight commodity. Granite runs 165–175 lbs/cuft; limestone is 130–160 lbs/cuft; sandstone is 120–145 lbs/cuft. At these densities, Class 50 is the only applicable freight class without exception. For dimensional stone slabs and tiles, the effective density with packaging is lower but still comfortably Class 50. The weight constraint is almost always the limiting factor rather than the cube constraint.

Equipment selection depends on the stone form. Crushed stone and aggregate move by dump trailer just like sand and gravel. Dimensional stone slabs — granite countertops, marble tile, limestone panels — require A-frame trailers or specialized stone racks that hold slabs vertically at an angle, preventing them from falling over while allowing edge-load distribution. Marble and granite slabs are extremely brittle at thin sections and will crack from their own weight if laid flat without full edge support.

Crushed stone weight on a dump trailer routinely approaches or exceeds 40,000 lbs of payload, requiring strict attention to axle weight limits. Route planning must account for posted bridge weight limits, which can restrict standard routes in rural areas. For dimensional stone, the weight per slab can be deceptive — a 2-cm slab of granite 9 feet by 5 feet weighs roughly 700–800 lbs. Loading and unloading requires appropriate lifting equipment at both ends. Rate context: bulk crushed stone freight is low-margin, high-volume work. Dimensional architectural stone moves at significantly better rates due to the specialized equipment and fragility risk.