River rocks are smooth, rounded stones naturally shaped by moving water. They are popular for landscaping, drainage solutions, and decorative features.

For pathways, 3-4 inches is common. For decorative beds, 2-3 inches might suffice. Deeper layers may be needed for specific drainage applications.

Yes, using a quality landscape fabric underneath helps prevent weeds and keeps the rocks from sinking into the soil over time.

Density varies, but a common estimate is around 2,500 – 2,700 pounds per cubic yard (or about 90-100 lbs per cubic foot). This calculator uses a default density you can adjust.

Sizes range from small (3/8 inch) to large (6 inches or more). The choice depends on the application and aesthetic preference.

Break the irregular area into smaller, regular shapes (rectangles, circles, triangles), calculate each, and then sum them. This calculator handles rectangles and circles.

River rocks are smooth and rounded, while crushed stone (gravel) is angular with sharp edges. Crushed stone compacts better for bases, while river rock is more decorative and better for drainage in some cases.

Smaller, compacted river rock can be used, but larger, loose river rocks are generally not ideal for driveways as they can shift under tires.

Maintenance typically involves occasional rinsing to remove debris and leaf blowing. Weeds can be an issue if landscape fabric wasn’t used or is damaged.

For small areas, bags might be convenient. For larger projects, buying in bulk (by the cubic yard or ton) from a landscape supplier is usually much more cost-effective.