Calculate how much crushed stone or gravel you need for the compacted sub-base under a concrete slab, driveway, or patio. Enter the area dimensions and base depth to get cubic yards and estimated tonnage for your delivery order.
Use angular crushed stone such as #57 limestone or #411 crusher run. Standard sub-base depth is 4 inches for residential driveways and patios, and 6 inches for heavy vehicle traffic. A properly compacted gravel base is the most important factor in preventing slab cracking.