River Rock Calculator
Calculate the volume and weight of river rock or decorative gravel needed for your landscaping project.
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How much river rock do I need?
Measure the length and width of the area in feet (or metres), then decide on the depth of rock coverage. For a decorative ground cover, 2–3 inches is typical. For drainage or erosion control, 4–6 inches is more common. Multiply length × width × depth to get the volume, then convert to cubic yards (divide ft³ by 27) for ordering purposes.
River rock is typically sold by the ton or cubic yard at landscaping suppliers. One cubic yard of river rock weighs approximately 2,800–3,200 lbs (1.4–1.6 US tons) depending on the size and type of rock.