Crushed Stone Calculator
— How Much Do You Need?

Crushed stone is quarried rock, typically limestone, granite, or trap rock, that gets mechanically crushed and screened down to a specific size. The process creates angular pieces with sharp, jagged edges. Gravel, by contrast, is naturally occurring. It forms as rocks are tumbled and worn smooth over time by water and weather, which gives gravel its rounded shape. That difference in shape matters a lot for how each material performs. The angular edges of crushed stone allow the pieces to interlock and compact tightly under pressure. This makes it the preferred choice for driveways, structural bases, and any application where you need the material to stay put under load. Rounded gravel tends to shift and roll more easily, which makes it a better fit for decorative purposes or loose-fill applications where compaction is less critical. Both materials are sold by the ton and delivered in bulk by the truckload. If you are deciding between crushed stone and gravel for your project, the Hello Gravel team is happy to help you think through which material is the better match for what you are building.

Crushed stone is one of the most versatile materials you can buy for a home or construction project. It handles weight, drains well, and compacts into a firm, stable surface, which is why it shows up in so many different applications. For driveways and parking areas, crushed stone is a top choice both as a base layer and as a finished surface. For patios, shed pads, and building foundations, a properly compacted layer of crushed stone creates a stable base that resists shifting and settling over time. For drainage projects like French drains, trench drains, and dry creek beds, clean crushed stone allows water to flow freely while holding soil in place. For walkways and garden paths, finer crushed stone provides a firm, comfortable surface underfoot. Beyond residential use, crushed stone is a standard material in commercial construction for road base, utility trench backfill, septic system beds, and pipe bedding. It is also used as the aggregate layer beneath concrete slabs and under interlocking pavers. If you are not sure whether crushed stone is the right fit for your specific project, reach out to the Hello Gravel team. We can point you in the right direction.

Crushed stone comes in a range of sizes, and choosing the right one makes a real difference in how well the material performs for your specific application. For driveways and parking areas, #57 crushed stone at roughly 3/4 inch is the most widely used option. It compacts well, drains effectively, and handles vehicle weight without migrating too much. For a deeper base layer under a heavy driveway or commercial pad, larger stone such as #2 or #3, ranging from about 1.5 to 3 inches, is sometimes used to add structural support before a finer layer goes on top. For paver and concrete slab bases, #57 or a blended material like #411, which combines crushed stone with finer stone dust, compacts tightly and creates the firm foundation that pavers need to stay level. For French drains and pipe bedding, clean #57 stone is the standard choice because its open structure lets water move through freely without clogging. For walkways and foot-traffic areas, smaller sizes like 3/8-inch stone or stone screenings create a smooth, compactable surface. If you are weighing options and want a recommendation based on your specific project, the Hello Gravel team can help you find the right size before you order.

The quantity you need comes down to two things: the area you are covering and the depth you are installing. Depth has a bigger impact on your total tonnage than most people expect, so it helps to have a clear target depth before you start calculating. As a general benchmark, one ton of crushed stone covers approximately 80 to 100 square feet at 2 inches deep. At 4 inches of compacted depth, which is the typical minimum for a driveway or structural base, that same ton covers roughly 50 to 60 square feet. If you are going 6 inches deep for a heavy-duty pad or high-traffic driveway, you can expect around 35 to 40 square feet per ton. To put that in practical terms, a 100-foot by 12-foot driveway at 4 inches deep works out to 1,200 square feet. At roughly 55 square feet per ton, you are looking at somewhere around 20 to 22 tons. A standard dump truck typically carries 14 to 20 tons depending on the truck configuration and material weight, so it is worth confirming load size when you order. These figures are estimates based on typical compaction rates. Your actual quantity will depend on your exact dimensions and local soil conditions. The Hello Gravel calculator lets you enter your measurements and get a more precise number before you commit to an order.

What you put under crushed stone depends on the project, but the foundation principle is the same across most applications: the surface beneath the stone should be stable, level, and free of loose organic material like grass, roots, or topsoil. For driveways, parking pads, and any structural base, start by grading the native soil so it is firm and well-drained. In soft or clay-heavy soils, many contractors lay a layer of geotextile landscape fabric before adding stone. The fabric acts as a separator, preventing the stone from sinking into soft ground over time while still allowing water to drain through. For walkways and lighter applications, fabric is optional, but the ground should still be leveled and cleared. Compaction is critical any time you want crushed stone to function as a base material. Loose, uncompacted stone will shift under load and will not give you the firm surface you are counting on. A plate compactor is the right tool for the job. For deeper installs, compact the stone in layers of no more than 4 inches at a time. This ensures the entire depth is solid, not just the surface. Skipping compaction is one of the most common reasons driveways and paver bases fail early. Taking the time to do it right at installation saves you from rework down the road.