Figuring out how much landscape rock to buy comes down to two numbers: the area you are covering and how deep you want the rock. Measure length times width for square footage, pick a depth, then convert that volume to tons or cubic yards. Plan on about 2 inches for decorative cover and 3 to 4 inches for paths and base work. This works for nearly any rock, which is why it is the starting point for sizing any job.
Step one: measure the area
Multiply length by width in feet to get square footage. A rectangle is straightforward. For an L shape or a curved bed, split it into rectangles, measure each, and add the pieces together. Round up rather than down so you are not short.
Step two: pick a depth for the job
Depth is where landscape rock projects differ, and it has the biggest effect on how much you order.
- Decorative cover (about 2 inches): beds, borders, and ground cover where you mainly want the look and to suppress weeds. Two inches hides the soil without burying plants.
- Paths and walkways (about 3 inches): a walking surface needs more material so it does not thin out and show dirt underfoot.
- Driveway base and heavy use (3 to 4 inches): anywhere vehicles drive or you need a stable base, go deeper so the rock holds up.
Step three: convert to tons or yards
Most landscape rock and gravel is sold by the ton; mulch and soil are usually sold by the cubic yard. The quick rule for rock is that one ton covers roughly 70 to 100 square feet at 2 inches, with bigger stone toward the low end and smaller, tighter-packing material toward the high end. If you would rather think in volume, one cubic yard covers about 150 square feet at 2 inches and about 100 at 3 inches. For the full breakdown of when to use each unit, see our guide on cubic yards vs tons.
Whichever unit you use, add about 5 to 10 percent for waste, settling, and topping off.
A worked example
Picture a backyard path, 20 feet long and 3 feet wide, that you want at 3 inches deep.
- Area: 20 times 3 equals 60 square feet.
- Depth: 3 inches for a walking surface.
- Coverage: at 3 inches, figure roughly 50 to 65 square feet per ton, so 60 divided by about 55 is a little over 1 ton.
- Waste: add 5 to 10 percent, so plan on about 1.2 tons.
Those are planning numbers. The coverage calculator takes your exact area and depth and returns the precise quantity in the right unit, so you do not have to estimate the per-ton coverage yourself.
Choosing the rock
The size and type of rock you pick affects coverage, so it is worth settling on a material before you finalize the amount. Browse landscape rock for the full range, or landscape gravel for finer, tighter-packing stone that suits paths and base layers. Decomposed granite is its own case with its own math; our guide on how much decomposed granite do I need covers it in detail.
Frequently asked questions
How do I calculate how much landscape rock I need?
Measure length times width for square footage, pick a depth, and convert to tons or cubic yards. As a rough guide, one ton covers about 70 to 100 square feet at 2 inches. Add 5 to 10 percent for waste.
How deep should landscape rock be?
About 2 inches for decorative beds and ground cover, around 3 inches for paths, and 3 to 4 inches for driveway base or heavy-use areas. Deeper layers hold up better under foot and vehicle traffic.
Is landscape rock sold by the ton or the cubic yard?
Most rock and gravel is sold by the ton because it is dense and heavy. Mulch and soil are usually sold by the cubic yard. For most rock, figure roughly 1.3 to 1.5 tons per cubic yard.
How much area does a ton of landscape rock cover?
Roughly 70 to 100 square feet at 2 inches deep, depending on stone size. Larger stone leaves more gaps and covers less area; smaller, tighter material covers more.
How much extra should I order?
Add about 5 to 10 percent over your calculated amount to allow for waste, settling, and topping off. Running the numbers through the coverage calculator gives you an exact figure to start from.
Get the materials
Browse landscape rock and landscape gravel, then run your dimensions through the coverage calculator for an exact quantity. For bulk loads or long-distance delivery, request a quote and we will work out freight. We deliver nationwide from our California yards.