River Rock Calculator

River Rock Calculator. The River Rock Calculator estimates how much decorative stone you need for landscaping projects like garden beds, pathways, or drainage areas. Enter your area (or length × width), depth, and rock type to get the volume in cubic yards and cubic feet, plus estimated weight in tons and the number of 50 lb bags needed. Add a price per cubic yard and waste factor to also see your projected total material cost. Also try the Fence Calculator.

Results

Volume Needed

Volume (Cubic Feet)

Estimated Weight

Total Cost

50lb Bags Needed

How much river rock do I need for my project?

The amount depends on your area and desired depth. For most landscaping projects, 2-3 inches of depth is recommended. Use our calculator to get accurate volume and weight estimates based on your specific dimensions. See also our calculate Total Fence Length, Posts Needed & Fence Sections — Fence Perimeter.

What are river rocks and their applications?

River rocks are naturally weathered stones found in riverbeds with smooth, rounded surfaces. They're commonly used for landscaping, drainage, walkways, garden beds, and decorative features around pools and water features.

How much does a cubic yard of river rock weigh?

River rock typically weighs between 1.2 to 1.6 tons per cubic yard, depending on the rock type and size. Standard river rock averages about 1.3 tons per cubic yard.

Why should I add a waste factor to my calculation?

A waste factor accounts for material loss during transport, spillage, and compaction. It also provides extra material for future repairs. A 10% waste factor is typically recommended for most landscaping projects. You might also find our Raised Bed Calculator useful.

How deep should river rock be for landscaping?

For most decorative applications, 2-3 inches is ideal. For walkways or high-traffic areas, use 3-4 inches. For drainage applications, 4-6 inches may be needed depending on your specific requirements.

How do I calculate river rock coverage area?

Calculate the total area by multiplying length times width for rectangular areas. For irregular shapes, break them into smaller rectangles and add the areas together. Always measure in the same units (feet or meters).

What's the difference between river rock types?

Different river rock types vary in color, size, and density. Standard river rock is versatile and cost-effective. Specialty types like Cheshire Pink or Congo River Rock offer unique colors for specific design aesthetics.

How much does river rock cost per cubic yard?

River rock costs typically range from $25-$60 per cubic yard depending on the type, size, quality, and your location. Specialty or decorative river rocks generally cost more than standard varieties.