River Rock Calculator
Enter your area and depth — get tons, cubic yards, bags, and bagged-vs-bulk cost for river rock in seconds.
A typical loose dry density. Suppliers vary — ask for yours, or pick Custom.
Add 10% for compaction & settling (recommended for driveways and bases)
Bags are convenient for small areas; bulk by the ton is dramatically cheaper once you pass a fraction of a cubic yard. Enter your local prices — we'll show which wins and by how much.
At a 2″ depth, one ton of this gravel covers roughly 114 sq ft. Coverage halves as you double the depth — about 57 sq ft per ton at 4″. Computed from the selected density. Driveways usually want about 6″ total over firm ground.
Round, smooth stone is comfortable underfoot and good-looking, but it shifts under load. Angular crushed stone locks together and stays put. Pick the type above to see specific guidance for driveways, paths, and drainage.
Compare gravel types.
The stone most US homeowners actually buy — size, typical weight, rough cost by the ton, and what each is for.
| Gravel type | Stone size | ~ Tons / yd³ | ~ Cost / ton | Best for |
|---|---|---|---|---|
| Pea gravel | 3/8" | ~1.3 | $30–50 | Patios, paths, play areas — not driveways |
| Crushed stone #57 | 3/4" | ~1.4 | $25–40 | Driveways, drainage, base layers |
| Crusher run / #411 | 0–3/4" | ~1.4 | $20–35 | Driveway base — compacts tight (has fines) |
| River rock | 1–3" | ~1.35 | $50–100 | Dry creek beds, drainage, decorative borders |
Cost ranges are typical US bulk prices and vary by region, stone, and haul distance. Weights are typical loose densities — confirm with your supplier.
How river rock is sold & measured.
River rock is large, rounded, water-worn stone, usually sold in the 1 to 3 inch range. Small bags hold 0.5 cubic feet; for a dry creek bed or a wide border you buy it loose by the ton from a local stone yard. Because the stones are big and rounded, they leave more open space between them, so a yard of river rock weighs a bit less and a ton spreads about as far as smaller gravel. The catch is depth: the layer needs to be at least as thick as the stones are wide to hide the ground.
To estimate either, start from volume. Measure your area, pick a depth, and the calculator works out the cubic feet, converts to cubic yards (27 cubic feet to a yard), and then to tons using the stone's density. From there it counts bags and prices the job both ways.
How deep should river rock go?
For a decorative border or a rock bed, 2–3 inches is enough to cover the ground and read as a finished surface. A dry creek bed or a drainage swale is usually deeper, so the channel holds and moves water. With larger stone you want the layer at least as deep as the stones are wide, or single rocks sit proud and the soil shows through.
Going deeper than that mainly adds cost. Because river rock is decorative and rarely compacted, the depth you choose is the depth you get — there's no settling to plan around the way there is with a driveway base.
Decorative and drainage features.
River rock shines in dry creek beds, drainage channels, downspout splash areas, pond edges, and borders — anywhere you want a natural, low-maintenance look that also lets water through. What it isn't is a walking surface: the large rounded stones are awkward and unstable underfoot, and they make a poor driveway for the same reason pea gravel does.
For paths and patios, smaller pea gravel or angular crushed stone is far more comfortable. Keep river rock for the decorative and drainage jobs it's built for.
Coverage and depth with big stones.
Larger stones don't pack as tightly, so a ton of river rock covers about as much area as a ton of fine gravel, but you need a deeper layer to cover the soil — and the bigger the rock, the more open space between pieces. It's worth ordering a little extra so you can place stones for looks rather than running exactly to the edge. The compaction toggle isn't really meant for decorative river rock, but the small allowance it adds can cover that placement margin.
Frequently asked questions.
How many tons are in a cubic yard of river rock?
Roughly 1.3–1.4 tons per cubic yard for typical 1–3 inch river rock. Larger stone leaves more open space, which nudges the figure down a little. The calculator uses the density of the type you pick, and you can enter a custom density if your supplier gives you one.
How much does a ton of river rock cover?
At a 2-inch depth, one ton of river rock covers roughly 120 square feet, but larger stone needs a deeper layer, at least as deep as the stones are wide, so plan your depth before you order. Coverage halves as you double the depth. The calculator shows the exact figure for your depth and stone.
Can I walk on or drive on river rock?
It's not built for it. River rock is decorative — the large, rounded stones are unstable and awkward underfoot, and they make a poor driveway for the same reason. For a comfortable path use smaller pea gravel; for a driving surface use angular crushed stone. Keep river rock for borders, beds, and drainage.
How much river rock do I need for a dry creek bed?
Measure the length and width of the channel and pick a depth deep enough to hold and move water — a dry creek is usually deeper than a flat decorative bed. Enter those numbers above and the calculator returns the tons, cubic yards, and bags. Order a little extra so you can place the larger stones for looks.
Should I buy river rock in bags or in bulk?
Bags suit small borders and tight spots. For a creek bed or a wide feature, bulk by the ton is far cheaper per unit — a cubic yard is 54 of the 0.5 cu ft bags — so the break-even comes well under a cubic yard even after delivery. The cost panel above compares both with your local prices.
Methodology & sources
Volumes are standard geometry; the cubic-feet result is divided by 27 for cubic yards and multiplied by the selected density for weight. Per-type densities are typical loose-dry values that sit inside the authoritative aggregate bulk-density range; where a project needs a precise figure, the custom-density field accepts a supplier's number. All arithmetic was verified with Python's Decimal to avoid floating-point drift.
Density & aggregate references (.edu / .gov):
- Pennsylvania State University — Aggregate Technician Certification Program (bulk density / unit weight, AASHTO T19) — link
- Michigan Department of Transportation — Standard Specifications for Construction, Section 902: Aggregates — link
- U.S. Federal Aviation Administration — AC 150/5370-10, Item P-208 Aggregate Base Course — link
Pricing: bagged 0.5 cu ft gravel from Home Depot and Lowe's (US), checked June 2026. Bulk $/ton and delivery are editable planning defaults — local stone-yard quotes vary, so the fields are yours to change.
Last methodology review: June 2026.
Independence: Sources are cited for reference only. The universities, agencies and retailers named on this page do not sponsor or endorse MaterialCalcs, and we are not affiliated with them. Retail prices were checked by hand and vary by store and region.