Weight is a practical concern in river rock projects that often gets overlooked during planning. It affects delivery logistics, vehicle load limits, and supplier pricing — and getting it wrong can mean unexpected extra charges on delivery day.
Standard River Rock Weight Per Cubic Yard
The standard figure used across the landscaping industry is 2,600 lbs (1.3 tons) per cubic yard for natural mixed river rock. This represents an average of the density of common stone types and sizes sold at most landscape supply yards.
However, actual weight varies based on several factors.
How Stone Size Affects Weight
Small pebbles (3/4 inch): Pack tightly, leaving minimal void space. One cubic yard contains a higher ratio of stone mass to air. Estimated weight: 2,700–2,800 lbs per cubic yard (1.35–1.4 tons).
Medium river rock (1–3 inch): Moderate packing efficiency. Standard weight applies: 2,500–2,600 lbs per cubic yard (1.25–1.3 tons).
Large river rock (3–5 inch): Loose packing, significant void spaces between stones. Estimated weight: 2,200–2,400 lbs per cubic yard (1.1–1.2 tons).
River Rock Ton Calculator: Practical Conversion Table
| Cubic Yards | Small Rock (lbs) | Medium Rock (lbs) | Large Rock (lbs) |
|---|---|---|---|
| 1 | 2,750 | 2,600 | 2,300 |
| 2 | 5,500 | 5,200 | 4,600 |
| 3 | 8,250 | 7,800 | 6,900 |
| 5 | 13,750 | 13,000 | 11,500 |
| 10 | 27,500 | 26,000 | 23,000 |
Calculate Cubic Yards of River Rock from Weight
If your supplier quotes only in tons and you need to figure out the volume:
Cubic Yards = Tons ÷ 1.3 (standard river rock)
For 5 tons of medium river rock: 5 ÷ 1.3 = 3.85 cubic yards
Use our river rock weight calculator to run this conversion instantly with adjustments for your specific rock type.
Calculate Cubic Feet of River Rock
Some smaller projects, bagged material orders, and regional suppliers still quote in cubic feet:
Cubic Feet = Cubic Yards × 27
Weight per cubic foot of river rock:
- Small pebbles: ~100 lbs per cu ft
- Medium river rock: ~95 lbs per cu ft
- Large river rock: ~85 lbs per cu ft
For 10 cubic feet of medium river rock: 10 × 95 = 950 lbs
