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River Rock Calculator

Select the material type and enter the required values to calculate the river rock volume, weight, and total cost instantly

Rock Type:

Custom:

lb/cu in ▾

Width:

m ▾

Length:

cm ▾

Wastage:

in ▾

Depth:

Price per one unit of mass (Optional):

$/lb ▾

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The river rock calculator helps you estimate the amount of river rock needed to cover a specific land area. You can also calculate the total volume, weight, and cost of river rock for your landscaping project using this landscaping rock calculator.

How Much River Rock Do I Need?

The required amount depends on the dimensions of the area you want to cover. Follow these steps:

Calculate the area of the land using length and width measurements.
Measure the depth of the area to be covered with river rock.
Multiply the depth by the area to get the total rock volume.
Multiply the density of the rock by the volume to get the total weight required.

For cost estimation, this river rock calculator can also compute the total project cost instantly.

Illustration:

Example: How much river rock is needed if:

Material: Cotswold Bold
Length of area: 124 feet
Width of area: 120 feet
Depth: 2 feet

Solution:

Step 1: Calculate the area

Area = Length × Width
Area = 124 ft × 120 ft
Area = 14,880 sq. ft

You can convert this to square meters using a square meter calculator.

Step 2: Calculate the volume

Volume = Area × Depth
Volume = 14,880 sq. ft × 2 ft
Volume = 29,760 cubic feet

Step 3: Calculate the weight

Weight = Density × Volume
Density of Cotswold Bold = 1,670 kg/m³
Weight = 1,670 kg/m³ × 29,760 cubic feet ≈ 1,480,000 kg

This is the total weight of river rock required.

How the River Rock Calculator Works

Our landscaping rock calculator has a simple interface to quickly calculate rock coverage.

Inputs:

Select the type of river rock
Enter length, width, and depth of the area
Enter the wastage percentage (if any)
Enter the cost per unit weight (optional)
Click Calculate

Outputs:

Volume and weight of river rock needed
Total land area
Price per unit volume (optional)
Total project cost

FAQs

How deep should I place river rock?

Depth depends on the size of the stones:

2 inches for stones ½ inch or smaller
3 inches for stones ¾ to 1 inch

You can use the river rock coverage calculator to determine the correct depth.

Do river rocks hold heat?

Yes, river rocks absorb heat in the summer, but less so in the winter.

Are river rocks renewable?

Yes, river rocks are a renewable resource.

River Rock Density

River rock is a type of gravel used in landscaping for durability and aesthetic appeal. Below are common river rock densities:

Rock Type	Density (kg/m³)
Standard river rock	1425
Bank gravel	1483
Cheshire pink gravel	1545
Congo River rock	1314
Cotswold buff	1670
Cotswold Gold gravel	2098
Crushed asphalt	721
Crushed granite	1320
Crushed stone	1602
Crystal River rock	1522
Dolomite gravel	1865
Granite	2650
Ivory Coast gravel	1506
Pea gravel	1788
Peace River rock	1490
Quartzite	2700
Regular gravel	1346
Sunset gold gravel	1505
White marble chips	1430

References:

Source: Wikipedia – River gravel

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