Planning guide
What is river rock?
River rock is naturally rounded stone used in dry creek beds, drainage features, borders, and low-maintenance ground cover.
How this calculation works
The measured footprint and depth produce installed volume. Estimated weight uses a representative density; stone size, void space, and moisture affect the delivered total.
Common measurement mistakes
- Choosing depth without considering stone diameter
- Expecting rock to stop weeds without preparation
- Ignoring slope and runoff movement
Professional tips
- Use sturdy edging to contain rounded stone
- Prepare drainage before covering the area
- View a physical sample because quarry colors vary
River Rock Calculator FAQs
How much extra river rock should I buy?
A 10% allowance is a practical starting point for settling, spillage, uneven grade, and measurement error. Complex shapes may justify a little more.
Should I measure before or after edging?
Measure the finished inside dimensions of the area. Permanent edging occupies space and should not be included in the material footprint.
What depth should I use?
Use a depth that fully covers the base—often 2–4 inches (5–10 cm) depending on stone size.