River Rock Calculator
Calculate river rock quantities in cubic yards, US tons, and retail bags for landscape beds, dry creek beds, and water features.
1Project Shape & Dimensions
2Gravel Type & Density
Smooth, colorful river stones for upscale decorative landscape beds, dry creek beds, erosion control on gentle slopes, and water features.
3Gravel Depth & Compaction
Accounts for roller compaction settlement, uneven ground contours, and wheelbarrow spill.
Material & Delivery Cost Estimator
- Bulk delivery dump trucks usually require a 10–12 ft wide clearance path.
- Always verify if your quarry quotes in Tons or Cubic Yards.
- Order ~10% extra to prevent having to pay a second delivery fee for a half-ton deficit.
River Rock Coverage & Tonnage Chart (4" Standard Depth)
| Landscape Area | Square Feet | Cubic Yards (with 10% waste) | US Tons | 0.5 ft³ Bags |
|---|---|---|---|---|
| Small Tree Ring / Planter | 50 sq. ft. | 0.68 yd³ | 0.92 tons | 37 bags |
| Foundation Border Bed (3×35 ft) | 105 sq. ft. | 1.43 yd³ | 1.93 tons | 77 bags |
| Dry Creek Bed (4×50 ft) | 200 sq. ft. | 2.72 yd³ | 3.67 tons | 147 bags |
| Full Front Yard Rock Bed | 500 sq. ft. | 6.79 yd³ | 9.17 tons | 367 bags |
Frequently Asked Questions: River Rock
Q: How deep should river rock be in landscaping beds?
The recommended depth for medium river rock (1" to 3") is 3 to 4 inches (approx. 2 stones deep). For larger 3" to 5" river cobbles, install at 4 to 6 inches depth to ensure complete ground and landscape fabric coverage.
Q: How much does a cubic yard of river rock weigh?
One cubic yard of river rock weighs approximately 1.35 US tons (2,700 lbs or 1,225 kg). River rock is slightly lighter in bulk density than crushed stone because larger rounded stones leave more void air space between pebbles.
Q: How much area does 1 ton of river rock cover?
At a standard 3-inch depth, 1 ton of river rock covers approximately 70 to 75 square feet. At a 4-inch depth, 1 ton covers roughly 50 to 55 square feet.
Q: Can weeds grow through river rock?
Weeds will not penetrate from beneath if heavy-duty non-woven geotextile fabric is installed prior to stone spreading. However, airborne dust and organic debris will settle between rocks over time; applying a pre-emergent weed barrier twice per year prevents surface seed germination.