Landscape Rock Calculator
Calculate landscape rock in cubic feet, cubic yards, tons, and pounds for a rectangular or circular area. Enter the finished depth, rock density, extra allowance, and local price to plan coverage and ordering.
Calculate Landscape Rock
Enter the finished project measurements and use your supplier’s density when available.
Current coverage is 0 square feet at the entered depth. Weight varies with rock type, grading, moisture, void space, and compaction.
How to Use the Landscape Rock Calculator
Measure the area that will receive rock and use the planned finished depth, not the depth of the excavation.
1. Measure the surface
Use length and width for a rectangle. For a circle, enter the full diameter.
2. Enter depth and density
Choose inches, feet, or centimeters and edit the density to match the supplier’s product.
3. Review volume and weight
Compare cubic yards or tons with the supplier’s sales unit, delivery minimum, and rounding method.
How Much Landscape Rock Do I Need?
Landscape rock quantity starts with surface area and installed depth. The calculator converts the measurements to feet, calculates volume, adds the selected allowance, and converts cubic yards to estimated weight.
One cubic yard contains 27 cubic feet. Weight is an estimate because the same volume can have a different mass depending on stone size, grading, moisture, and space between pieces.
- Rectangle area = length × width
- Circle area = π × (diameter ÷ 2)²
- Cubic feet = area × depth in feet
- Cubic yards = cubic feet ÷ 27
- Estimated tons = cubic yards × density
Landscape Rock Formulas
The extra allowance is applied before volume, weight, and cost are displayed. Replace the default density with a supplier value for a closer tonnage estimate.
Landscape Rock Coverage by Depth
Approximate cubic yards below do not include an extra allowance.
| Area | 2 inches | 3 inches | 4 inches |
|---|---|---|---|
| 100 sq ft | 0.62 yd³ | 0.93 yd³ | 1.23 yd³ |
| 250 sq ft | 1.54 yd³ | 2.31 yd³ | 3.09 yd³ |
| 500 sq ft | 3.09 yd³ | 4.63 yd³ | 6.17 yd³ |
| 1,000 sq ft | 6.17 yd³ | 9.26 yd³ | 12.35 yd³ |
Common Landscape Rock Projects
Depth and preparation depend on the material, ground conditions, drainage, foot traffic, and project purpose.
Decorative beds
Landscape rock can provide a durable surface around established plants. Keep material away from trunks and crowns.
Paths and borders
Measure curves as smaller simple shapes or use an average width along the path.
Drainage areas
Rock size, filter fabric, slope, and drainage design affect the finished section. Volume alone does not confirm drainage performance.
Circular features
Use the outside diameter for a full circle. Subtract the inner circle when calculating a ring.
Rock type and density
Decorative gravel, crushed rock, and lava rock can have different bulk densities. Ask the supplier for product data.
Cost planning
Enter the current local price per ton or cubic yard. Delivery, minimum orders, tax, and installation are separate unless quoted.
Improve Your Landscape Rock Estimate
Divide irregular areas into rectangles and circles, calculate each section, and add the totals. Take several depth readings when the surface is uneven. Confirm whether the supplier sells by cubic yard, short ton, bag, or pallet. Ask whether quoted volume is loose or compacted and whether delivery has weight limits. River rock is kept as a separate future calculator because its search intent and material choices may differ.
Compare related materials with the Gravel Calculator, Stone Calculator, or Mulch Calculator.
Landscape Rock Calculator FAQ
How much landscape rock do I need?
Multiply the surface area by the finished depth to get volume. Convert cubic feet to cubic yards by dividing by 27, then add a suitable project allowance.
How many tons of landscape rock do I need?
Multiply cubic yards by the rock’s bulk density in tons per cubic yard. Use a supplier density because rock type and grading change weight.
How many square feet does a ton of landscape rock cover?
Coverage depends on depth and density. A ton covers more area at a shallow depth and less area at a greater depth.
How many cubic yards of landscape rock do I need?
Find cubic feet from area and depth, then divide by 27. The calculator performs the unit conversions and adds the selected allowance.
How deep should landscape rock be?
The correct depth depends on rock size, site preparation, foot traffic, drainage, and the project goal. Follow product and project guidance.
How do I calculate rock for a circular area?
Square the radius and multiply by π to find area. Multiply that area by depth to calculate volume.