To size up a river rock project, multiply length by width for your square feet, multiply that by the depth you want in feet, then divide by 27 to get cubic yards. That one calculation covers almost any yard. Most decorative areas sit right at a 2 to 3 inch depth, and bulk river rock generally runs somewhere around $50 to $150 per cubic yard before delivery.
Run the Numbers, With an Example
Say you’re covering a bed that measures 10 feet by 12 feet at a 3 inch depth. Here’s how it shakes out:
- Square footage: 10 times 12 gives you 120 square feet.
- Depth in feet: 3 inches is a quarter of a foot, or 0.25.
- Cubic feet: 120 times 0.25 lands at 30 cubic feet.
- Cubic yards: 30 divided by 27 comes to about 1.1 cubic yards.
So you’d order a little over one cubic yard. Round up a touch, since settling and uneven ground always eat more than the math suggests. An online river rock calculator runs the same steps, and knowing the formula lets you sanity check any number a supplier quotes.
What a Cubic Yard Actually Covers
Coverage depends entirely on depth, so a single yard stretches further when you spread it thin. This table shows roughly how much surface area one cubic yard covers:
| Depth | Coverage per cubic yard | Good for |
| 1 inch | about 324 sq ft | Light top dressing over fabric |
| 2 inches | about 162 sq ft | General ground cover, beds |
| 3 inches | about 108 sq ft | Full coverage, walkways |
| 4 inches | about 81 sq ft | Drainage, high traffic, driveways |
River rock is heavy, so suppliers often sell it by weight too. A cubic yard runs roughly a ton and a third, and any yard selling by the ton will convert the number for you.
River Rock Cost Calculator
Estimate how much river rock your project needs — by dimensions, area, or volume — and get an instant material cost. Then let our in-house crew deliver and install it right.
Results: River Rock Needed
Tip: order about 10% extra for waste, settling, and uneven ground. Material only — delivery & install quoted separately.
What River Rock Costs
Material is the bulk of the cost, and it swings with the stone and your area. Bulk river rock generally lands around $50 to $150 per cubic yard, or close to $40 to $120 per ton. Bagged river rock costs more per unit, though it’s handy for a small border or a single planter. A few things nudge the final number:
- Stone size and type, since larger or specialty river rock with richer minerals and color costs more.
- Depth, because a deeper layer means more cubic yards and more money.
- Delivery distance, which adds a haul fee that grows with how far the truck travels.
- Site access, as a tight or sloped yard slows the crew and raises labor.
- Bulk versus bags, where buying by the yard saves a lot on bigger areas.
For a true estimate, measure your space, settle on a depth, and price it locally, since delivery alone can change the picture.
How Deep Should You Go?
Depth is where people tend to over or under order. For decorative purposes, a 2 to 3 inch layer hides the soil and looks full without burying your plants. Pathways and walkways feel better at 3 inches so the stones stay put underfoot.
Driveways and drainage runs want 3 to 4 inches or more for a stable fill. Laying landscape fabric underneath first keeps weeds down and stops the rock from sinking into the dirt over time.
River rock pulls real duty for soil erosion control and drainage, which is why you’ll see it lining french drains, swales, and dry creek beds.
Agencies like the EPA point to slowing and soaking up stormwater runoff as a smart way to keep soil from washing off your property, and a well-placed bed of stone does exactly that.
If you’re mapping the whole yard before ordering, our walkthrough on designing a landscape plan helps you place rock, beds, and paths so the measuring goes smoothly.
River Rock, Pea Gravel, Lava Rock, and Crushed Stone
Different types of stone serve different jobs, so a quick comparison helps before you commit:
- River rock is smooth and rounded, usually a half inch to a few inches in diameter, great for beds, borders, and creek beds.
- Pea gravel is small and pea sized, soft underfoot, and a favorite for pathways and patios.
- Lava rock is light, porous, and holds color well, often used around fire features as a low weight ground cover.
- Crushed stone has sharp edges that lock together, the go to base under pavers, concrete, and driveways.
Texture, weight, and color all play in, so it’s worth seeing samples in your own light before ordering a full load. If you’d rather not guess, our landscape design team can spec the right stone and layout for your yard.
Quick Questions People Ask
How much river rock do I need for 200 square feet? At a 2 inch depth, 200 square feet needs about 1.25 cubic yards. Bump it to 3 inches and you’re closer to 1.85. Depth drives the whole calculation.
Is river rock cheaper than pea gravel? They’re often in the same ballpark per cubic yard, though pea gravel can run a touch less. Coverage and delivery usually matter more to your total than the gap between the two.
Does river rock really help with drainage? Yes. Its rounded shape leaves gaps that let water move through, which is why it works so well in french drains and around downspouts to protect your foundation.
How heavy is a yard of river rock? Plan on roughly 2,400 to 2,800 pounds per cubic yard, give or take with the stone. That weight is exactly why delivery beats hauling it yourself.
Rather Let Us Crunch the Yards and Spread the Stone?
Measuring, calculating cubic yards, and wheelbarrowing a couple of tons across the yard on a hot afternoon is a real chore. We’re glad to handle the whole thing, the math, the grading, and the final raked finish, and get the depth and drainage right the first time.
Take a look at how we approach river rock and outdoor stonework, then let us carry the load. Call us at (979) 575-6019 or message us here, and you can enjoy the finished yard instead of measuring it.