Calculate Your Project
Project Diagram
Total Volume
—Cubic Yards
Enter dimensions above
Estimated Weight
—Tons
Based on River Rock density (1.35 t/yd³)
Free River Rock Calculator
Design beautiful river rock landscapes.
River rock is heavy and expensive. Calculate the exact cubic yards and tons needed for your project before you order — and never overspend on stone again.
River Rock Reference Guide
River Rock Density & Weight Reference
| Measurement System | Total Volume | Estimated Weight |
|---|---|---|
| Imperial (US) | 1 Cubic Yards | 1.35 Tons (2,700 lbs) |
| Metric (EU) | 1 m³ | 1.77 Tonnes (1,766 kg) |
* Note: Exact weight can vary based on moisture content and compaction.
Recommended Depths for River Rock
| Project / Use Case | Recommended Depth |
|---|---|
| Decorative Ground Cover | 2–3 inches |
| Dry Creek Bed | 4–6 inches |
| Garden Border / Edging | 3–4 inches |
| Drainage / French Drain | 12 inches |
How to Calculate River Rock Volume
Most landscaping suppliers sell river rock by the cubic yard. To convert your project area to cubic yards, use this formula:
Volume (cu yd) = (Length × Width × Depth) ÷ 27
Our calculator also multiplies your cubic yard result by 1.35 tons/yd³ (the standard density for river rock) to show estimated weight — essential if you are hauling the material yourself or need delivery pricing.
Pro Tips & Insights
1
Install a weed barrier (landscape fabric) beneath all river rock to prevent weeds from growing up through the stones.
2
River rock does not decompose, so it is a zero-maintenance alternative to wood mulch in hot climates.
3
For dry creek beds, mix small (1-3 inch) and large (3-5 inch) rocks for a natural, realistic appearance.
Frequently Asked Questions
How much river rock do I need?▼
For a decorative layer, plan for 2 to 3 inches of depth. For a dry creek bed or drainage project, you need 4 to 6 inches. Enter your area dimensions above for the exact cubic yards and tons required.
How much does river rock weigh per cubic yard?▼
One cubic yard of river rock weighs approximately 2,700 lbs (1.35 tons). Because it is so heavy, large orders must be delivered by dump truck. A standard pickup truck can safely carry about 1 cubic yard.
Is river rock or mulch better?▼
River rock is better in hot, dry climates or high-traffic areas because it is permanent and does not decompose. Wood mulch is better for garden beds as it breaks down and adds nutrients to the soil. River rock does not insulate soil as well as mulch.
What size river rock is best for landscaping?▼
1 to 3 inch river rock is the most popular size for ground cover and garden beds. 3 to 5 inch rocks are ideal for dry creek beds and drainage. Larger boulders (6+ inches) are used as accent pieces.