1 cubic yard of river rock weighs 2,400-2,900 lbs (1.08-1.31 metric tons)
A cubic yard of river rock typically weighs between 2,400-2,900 pounds (1.08-1.31 metric tons), depending on size, density, and moisture content. Smaller pebbles (1-2") weigh more per yard due to tighter packing, while larger stones (3-6") weigh less. Always confirm with your supplier for precise calculations.
Key Factors Affecting Weight
- Rock size: Smaller rocks (e.g., ½-1") pack densely, increasing weight per yard.
- Material density: Granite or basalt river rock weighs more than limestone or sandstone.
- Moisture: Wet rock can add 100-300 lbs/yard compared to dry.
- Compaction: Loosely piled rock weighs less than compacted loads.
Weight Comparison by River Rock Size
| Rock Size | Weight per Cubic Yard (lbs) | Weight per Cubic Yard (tons) | Best For |
|---|---|---|---|
| ½-1" (pebble) | 2,700-2,900 | 1.22-1.31 | Pathways, drainage, decor |
| 1-2" (small) | 2,500-2,700 | 1.13-1.22 | Landscaping, ground cover |
| 2-4" (medium) | 2,300-2,500 | 1.04-1.13 | Erosion control, borders |
| 3-6" (large) | 2,000-2,300 | 0.90-1.04 | Retaining walls, water features |
How to Calculate Weight for Your Project
- Measure volume: Calculate cubic yards needed (length × width × depth ÷ 27).
- Check rock specs: Ask suppliers for the exact weight per yard for your chosen size/type.
- Add 5-10% buffer: Account for moisture, compaction, or delivery variations.
- Verify truck capacity: Standard dump trucks hold 10-14 cubic yards (max ~20 tons).
Common Uses and Estimated Quantities
- Drainage layer (2" depth): ~135 lbs/sq ft → 7-8 tons per 100 sq ft.
- Pathway (3" depth): ~200 lbs/sq ft → 10-12 tons per 100 sq ft.
- Retaining wall backfill: ~1.5-2 tons per cubic yard (larger rocks).
- Pond/stream beds: ~1.2-1.5 tons/yard (mixed sizes for natural look).
Safety and Handling Tips
- Use a wheelbarrow (max 600 lbs capacity) or skid steer for large quantities.
- Wear gloves-river rock edges can be sharp, especially larger sizes.
- Avoid overloading trailers: 1 cubic yard ≈ 1.2-1.5 tons (check vehicle limits).
- Spread rock in layers to prevent soil compaction or uneven settling.