River Rock Calculator
Estimate the amount of river rock required for landscaping, pathways, drainage systems, flower beds, and decorative outdoor projects.
What Is River Rock?
River rock is a naturally rounded stone commonly used in landscaping, drainage systems, gardens, decorative borders, water features, and walkways. It provides excellent drainage while adding an attractive natural appearance to outdoor spaces.
How to Estimate River Rock
To estimate the amount of river rock required, multiply the project’s length, width, and depth to determine the total volume. The volume is then converted into cubic yards since landscaping materials are typically sold by the cubic yard.
Formula:
Volume = Length × Width × Depth
Cubic Yards = Cubic Feet ÷ 27
Typical River Rock Depths
| Application | Recommended Depth |
|---|---|
| Decorative Landscaping | 2–3 Inches |
| Garden Beds | 2–4 Inches |
| Walkways | 3–4 Inches |
| Drainage Areas | 4–6 Inches |
| Dry Creek Beds | 4–8 Inches |
Benefits of River Rock
- Improves drainage
- Reduces soil erosion
- Low-maintenance landscaping material
- Long-lasting decorative solution
- Does not decompose like mulch
- Helps suppress weeds
- Available in multiple sizes and colors
- Suitable for residential and commercial projects
Frequently Asked Questions
How much river rock do I need?
The required amount depends on the area’s length, width, and desired depth. Most landscape suppliers sell river rock by the cubic yard.
How much does one cubic yard weigh?
One cubic yard of river rock generally weighs between 2,400 and 2,700 pounds depending on rock size and moisture content.
What depth should river rock be installed?
Most landscaping projects require 2 to 4 inches of depth, while drainage projects often require deeper coverage.
Should landscape fabric be installed first?
Yes. Landscape fabric helps reduce weed growth while keeping the river rock separate from the soil.
