River Rock Calculator
— How Much Do You Need?

The amount of river rock you need depends on two things: the square footage of your project area and how deep you want to lay the material. As a general guideline, one ton of river rock covers roughly 100 square feet at a depth of 2 inches, or approximately 55 to 65 square feet at a depth of 4 inches. Keep in mind that larger river rock sizes leave more air gaps between stones, so your actual coverage may vary slightly from those estimates. Rather than doing the math by hand and second-guessing yourself, the Hello Gravel online calculator takes the guesswork out of the process. Enter your project dimensions and your target depth, and youll get a precise quantity estimate in tons. When in doubt, it's always smarter to order a little more than you think you need. Running short midway through a project means a second delivery and extra downtime.

The right depth depends on what youre trying to accomplish. For decorative landscaping beds and garden borders, 2 to 3 inches gives you solid, attractive coverage without using more material than necessary. If weed suppression is your main priority, aim for 3 to 4 inches so the layer is thick enough to block sunlight from reaching the soil below. For drainage applications like a dry creek bed or a gravel channel alongside a foundation, 4 to 6 inches is more appropriate depending on the volume of water youre managing. For foot traffic paths, 2 to 3 inches of river rock provides a walkable surface without being overly loose underfoot. Getting the depth right from the start helps you order accurately and avoid having to add material later, so keep your intended use in mind when you punch your numbers into the Hello Gravel calculator.

River rock pricing depends on your location, the stone size you choose, and current material and fuel costs in your area. Because those factors shift over time, quoting a fixed number here would not give you an accurate picture of what you'd actually pay today. The most reliable way to get current pricing is to use the Hello Gravel calculator. Enter your project dimensions and it will show you upfront pricing for your area with no hidden fees. What you see is what you pay. If you want to talk through your project before placing an order, the Hello Gravel team is glad to help you figure out the right quantity and get you a clear number.

The single most important step before laying river rock is installing a landscape weed barrier fabric directly over the soil. This fabric serves two purposes. First, it blocks sunlight so weeds cannot push up through the rock layer. Second, it keeps the stones from gradually sinking into the ground over the years, which helps you maintain consistent coverage with less topping off over time. For drainage channels and dry creek beds, the approach is a little different. In those cases, youll want to grade the ground first so water flows in the intended direction before any rock goes in. For driveways or heavily used paths, a compacted base layer beneath the river rock adds stability and helps prevent the surface from shifting and spreading under repeated traffic. Taking the time to prepare the ground correctly before your delivery arrives will save you a lot of effort on the back end.

River rock is not recommended for driveways or parking areas. Because the stones are naturally smooth and rounded, they roll rather than lock together under vehicle tires. That means river rock shifts, scatters, and kicks out underfoot and under traffic and no amount of edging or base preparation changes that, since the problem is the rounded shape of the stone itself, not the installation. For any driveway that sees vehicle traffic, angular crushed stone is the right material because it compacts firmly and holds its position over time. River rock is far better suited to decorative uses like garden bed borders, dry creek beds, and landscaping features where appearance matters and vehicles are not a factor. If you are not sure which material is right for your specific situation, reach out to the Hello Gravel team and describe your project. They can help you choose the right material so you are not spending more time and money fixing it later.