River Rock and Landscape Rock Calculator
Enter the size of the bed and a depth and get the river rock or landscape rock to order in cubic yards or bags, rounded up once; tons need the weight your supplier gives.
A ready-made setup of the Gravel Calculator.
Estimates for planning, not professional advice. Read the full notice.
The drawing did not open. Length and width are still here.
Bed: shape and size
Skip the drawingDrag a round corner to move it. The small hollow diamond on a side is its curve handle: drag it across the side to curve the side (it is not a corner). To add a corner (a new point), tap the side itself, then choose Add a point here. Tapping a corner or a side opens its actions. Drag empty space to move the view; pinch, or Ctrl and the mouse wheel, to zoom. The keys are listed under Keys.
Keys
- Tab
- next corner; each says how far it is from corner 1
- Arrow keys on a corner
- move it one square; ten with Shift; 1/16 in with Alt
- Delete or Backspace
- remove the corner; its two sides join in one straight side
- + on a corner
- add a corner halfway along the next side
- Arrow keys on the drawing
- move the view; farther with Shift
- + and - on the drawing
- zoom in and out
- 0 on the drawing
- show the whole shape
- Ctrl+Z (Cmd+Z on a Mac)
- undo, except inside a typed field (it keeps its own)
- Ctrl+Shift+Z or Ctrl+Y
- redo
- Escape while dragging
- put it back where it was
- Enter on a corner or side
- go to its actions
- Escape in the actions
- close them and go back to the drawing
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- Area
- 100 ft²
- Perimeter
- 40 ft
- Cut-out edges
No area until the shape is fixed.
Estimate for planning, from what you entered and the product data shown. Check product labels and your supplier before you buy.
Shape: Rectangle Change
Sides
Corners
Cut-outs
Feet and inches, like 12' 6"
Example: a river rock bed
1 yd³ to order (0.93 yd³ exact)
- Volume in the area 25 ft³
- Cubic yards to order 0.93 yd³
- Cubic yards at the supplier's step 1 yd³
- Bags of the size above 50 × 0.5 ft³ bags
Your project
Enter a size to see your total.
Each product is rounded up once for the whole project, so the total can be less than the items bought alone added together. A line counted from a cut layout (sheets, boards or tiles laid out piece by piece) is counted for each item and added.
Shopping list
| Item | Size | Buy |
|---|---|---|
| River rock by the cubic yard | 1 yd³ | 1 yd³ |
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Worked example: a river rock bed
Show the working
- Area 10 ft × 10 ft = 100 ft²
- Volume at the depth 100 ft² × 3 in = 25 ft³
- Add the waste allowance, once 25 ft³ + 0 % waste = 25 ft³
- Cubic yards: divide by the cubic feet in a yard 25 ft³ ÷ 27 ft³ in a yd³ = 0.93 yd³
- Round up once, to the supplier's yard step 0.93 yd³ = 1 yd³
Assumptions
The figures behind the example. Sourced figures link to their source below; a default is a starting value to check against your label or supplier.
| Assumption | Value | Details and changes |
|---|---|---|
| Landscape waste or overage | 0% | |
| Default No silent overage. Check your label or supplier. | ||
| Supplier's smallest yard step | 0.5 yd³ | |
| Default Suppliers sell bulk in steps. Check your label or supplier. | ||
| Supplier's smallest ton step | 1 ton | |
| Default Suppliers sell by the ton in steps. Check your label or supplier. | ||
| Stone bag size | 0.5 ft³ | |
| Default Bag sizes are on the label. Check your label or supplier. | ||
Feet and inches, like 12' 6"
River rock coverage by depth
Cubic yards of river rock for a ten by ten foot bed and a four hundred square foot bed at four depths, with no waste allowance
| Depth | Ten by ten foot bed | Four hundred square feet |
|---|---|---|
| 2 in | 0.62 yd³ | 2.47 yd³ |
| 3 in | 0.93 yd³ | 3.7 yd³ |
| 4 in | 1.23 yd³ | 4.94 yd³ |
| 6 in | 1.85 yd³ | 7.41 yd³ |
Each cell is worked out on its own. The stone size does not change the volume of the bed, only how the rock is sold.
Questions
How many yards of river rock for a ten by ten foot bed?
The coverage table gives cubic yards for that bed and for a larger one at four depths; the calculator rounds your own bed up once to the supplier's step.
How much area does a ton of river rock cover?
That depends on the weight of the rock. Enter the weight per cubic yard your supplier gives and choose tons; no source gives a river rock weight, so the calculator never fills one in.
Does the rock size change how much I need?
No. Volume comes from the area and the depth. Larger stone may need a deeper layer, which is a depth you type.