Rock Fill Calculator – Estimate Volume & Material Needed

Last updated: 27 Mar 2025 | Author: Brij | Review By: Irshad

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Simply input the area, depth, and density, and the calculator will provide the volume in cubic meters and the weight in kilograms.

Area:

Depth:

Density (optional): see here

Result

Volume:

Weight:

Density of Common Rock Types

Rock Type	Density (kg/m³)	Density (lbs/ft³)	Description
Granite	2,600 to 2,700 kg/m³	162 to 168 lbs/ft³	A dense, durable igneous rock commonly used in construction.
Basalt	2,700 to 3,100 kg/m³	168 to 194 lbs/ft³	A dense volcanic rock, often used in road construction.
Limestone	2,300 to 2,700 kg/m³	144 to 168 lbs/ft³	A sedimentary rock, lighter than granite, used in construction and cement.
Sandstone	2,000 to 2,600 kg/m³	125 to 162 lbs/ft³	A sedimentary rock, less dense than granite, used in construction.
Marble	2,500 to 2,800 kg/m³	156 to 175 lbs/ft³	A metamorphic rock, often used in decorative applications.
Slate	2,600 to 2,800 kg/m³	162 to 175 lbs/ft³	A metamorphic rock, commonly used for roofing and flooring.
Shale	2,000 to 2,700 kg/m³	125 to 168 lbs/ft³	A sedimentary rock, often used in construction and as a source of oil/gas.
Gneiss	2,600 to 2,900 kg/m³	162 to 181 lbs/ft³	A metamorphic rock, similar to granite in density.
Pumice	500 to 1,000 kg/m³	31 to 62 lbs/ft³	A lightweight volcanic rock, used in lightweight concrete and abrasives.
Scoria	1,000 to 1,500 kg/m³	62 to 94 lbs/ft³	A volcanic rock, lighter than basalt, used in landscaping and construction.

If you're planning a construction or landscaping project and need to know how much rock fill you need, this calculator will help you estimate both the volume and weight of the material required. You just need to enter the area, depth, and density, and the calculator does the rest.

What is Rock Fill Used For?

Rock fill is commonly used in construction and landscaping projects for:

Filling low areas
Base material under roads or pavements
Drainage layers
Retaining walls
Landscaping design

How the Rock Fill Calculator Works

This calculator asks you to enter:

Area (in square meters or square feet)
Depth (in meters, feet, or inches)
Density of the rock fill (in kg/m³ or lbs/ft³)

Then it calculates:

Volume of rock fill needed
Weight of the rock based on the volume and density

Formula to Calculate Volume

To calculate the volume of rock fill, we use the formula:

$\text{Volume} = \text{Area} \times \text{Depth}$

Formula to Calculate Weight

Once we have the volume, we calculate the weight using this formula:

$\text{Weight} = \text{Volume} \times \text{Density}$

Example Calculation

Let’s say you have:

Area = 100 square meters
Depth = 0.5 meters
Density = 1600 kg/m³

Step 1: Calculate Volume

$\text{Volume} = 100 \times 0.5 = 50 \text{ m}^3$

Step 2: Calculate Weight

$\text{Weight} = 50 \times 1600 = 80,000 \text{ kg}$

Conversion (Optional)

If you want the weight in tons:

$\text{Weight in tons} = \frac{80,000}{1000} = 80 \text{ tons}$

Final Thoughts

This Rock Fill Calculator is a handy tool for anyone working with large volumes of stone or gravel. It saves time and helps you order the right amount of material for your job. Whether you’re filling a hole, preparing a foundation, or designing a landscape, knowing how much rock you need avoids waste and extra cost.

Check out 1 similar Rock Fill Calculator – Estimate Volume & Material Needed :

Rock Fill Calculator – Estimate Volume & Material Needed

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