River Rock Calculator

Multiply the area you are covering by the depth in feet to get cubic feet, then divide by 27 for cubic yards. River rock in the common 1 to 3 inch size weighs roughly 1.35 to 1.5 tons per cubic yard, so a 216 square foot bed at 3 inches deep needs about 2.7 tons. Enter your own measurements above, and adjust the density if your supplier quotes a different figure.

Two inches is standard for a flat decorative bed or border, since more depth adds cost without improving appearance or weed suppression. Pathways and areas with foot traffic hold up better at 3 inches. A dry creek bed or drainage channel needs more mass to handle moving water and typically runs 4 inches or deeper, often with larger stone on the surface than a purely decorative bed would use.

Dry creek beds generally use river rock in the 3 to 5 inch range, sometimes larger at the surface, because bigger stones stay in place when stormwater actually moves through the channel during a storm. Smaller 1 to 3 inch rock is more prone to washing downstream in a functioning drainage channel, even though it works fine in a purely decorative bed that never carries real water flow.

The 1 to 3 inch range is the general-purpose size most decorative beds, mulch-replacement ground cover, and borders use, and it's what this calculator's default density is built around. Smaller 3/4 inch river rock (sometimes called Delaware River Rock) works better for pathways and garden paths, where a finer, more walkable surface matters more than mass.

River rock commonly runs somewhere in the $40 to $130 per ton range, well above plain gravel's typical $30 to $40, and specialty types like Mexican beach pebbles or rainbow river rock can cost several times that. The premium reflects sourcing and sorting rather than a different raw material, since river rock has to be collected and screened to size rather than crushed on demand. Confirm your local supplier's current rate and enter it above for an accurate total.

Crushed gravel and stone are mechanically broken and screened from quarried rock in a straightforward, high-volume process. River rock is naturally water-worn and has to be collected and sorted to size, and a meaningful share of its price reflects that sourcing effort and its decorative appeal rather than a fundamentally different or scarcer raw material.

River rock in the common 1 to 3 inch size weighs roughly 2,800 to 3,000 pounds per cubic yard, about 1.4 to 1.5 tons. Larger stones, 3 to 5 inches and up, tend to weigh somewhat less per cubic yard, since bigger rounded rock leaves more void space between individual stones than smaller material packs. The calculator above defaults to 1.35 tons per cubic yard but lets you enter your supplier's exact figure.

River rock is naturally rounded and smooth, collected and sorted by size rather than mechanically produced. Crushed stone is quarried rock broken and screened into angular, uniform grades that interlock when compacted, which is why it's the choice for driveway bases and structural backfill. River rock is mainly decorative and doesn't compact or lock together the same way, so it isn't a substitute for crushed stone in a load-bearing application. If crushed stone is what your project actually needs, the stone calculator carries density and sizing defaults built for it.

Yes. "River rock" and "river stone" describe the same naturally rounded, water-worn material, collected and graded by size rather than crushed to shape, and suppliers use the two names more or less interchangeably. Some yards reserve "river stone" for the smaller, more uniform decorative sizes and "river rock" for the fuller size range up through dry-creek-bed stone, but there's no strict industry-wide rule. Whichever name your supplier uses, the sizing and density guidance on this page applies the same way.

River rock works as the visible top layer of a drainage feature, but the functional filtering and water-routing work in a French drain is usually done by angular crushed stone (such as #57 stone) around the perforated pipe, since angular pieces create more effective void space for water to move through than rounded river rock does. A common approach is angular stone below and around the pipe, with a layer of decorative river rock on top where it's visible.

For a decorative bed or border, yes, a fabric barrier under river rock slows weed growth and keeps the stones from settling into the soil over time. In a dry creek bed, fabric also helps separate the rock from the soil beneath so the channel keeps draining freely instead of the ground silting up into the gaps between stones.

No, it calculates the loose volume and weight for the area and depth you enter. River rock doesn't compact the way crushed stone does, but real installations still lose some material to uneven ground and spillage during placement, so it's common to add roughly 10 percent to the calculated total as a buffer, especially on an irregularly shaped bed or creek bed.

It depends heavily on both depth and stone size. At a 2 inch decorative depth, a ton of standard 1 to 3 inch river rock covers roughly 70 to 90 square feet, with smaller, more tightly-packing stone landing at the higher end. Larger river rock covers noticeably less per ton at any given depth: 3 to 6 inch stone runs closer to 50 square feet per ton, and rock over 6 inches drops to roughly 25 square feet per ton, since bigger stones carry more weight per piece and leave more void space. Enter your own area and depth above rather than relying on a flat per-ton rule of thumb.

A cubic yard is 27 cubic feet. A standard homeowner wheelbarrow rated at 2 cubic feet but realistically loaded to about 1.5 cubic feet to avoid tipping takes around 18 loads to move a full yard. A larger contractor wheelbarrow rated at 3 cubic feet, loaded to a practical 2 cubic feet, gets there in about 13 to 14 loads. Either way, hauling river rock by wheelbarrow for anything beyond a small border is slow going, which is why most suppliers will dump a full load by the driveway or bed for anything over a ton or two.