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Gravel Calculator

Our Gravel calculator allows you to estimate the quantity of gravel required for your project. Provide the measurement of the excavation and it returns the area and volume of the excavation and weight of the gravel required.



What is Gravel?

Gravel is made up of rock fragments. Gravel used for typical commercial use is usually of smaller size but its size can range from granule (2mm to 4mm) to boulder. Gravel is commonly used to build roads, paths, driveways and even patios.

There are numerous types of gravel available some chosen because of their size and shape and some chosen for their color. For example, pea gravel is chosen because of its round shape and small size, which makes it most comfortable to walk on.

Types of gravel

Most common types of gravel:

  1. Base Gravel #3

    Base gravel consists of irregularly shaped rocks of one to two inches. Due to their irregular shape they provide perfect drainage. They are perfect for solid foundations.

  2. Pea Gravel

    Pea gravel is small rocks typically 3/8” in size that are naturally weathered. They are often chosen due to their small size and rounded shape. It makes them perfect for driveways, flowerbeds and walkways. Pea gravel usually require edging to prevent them from moving away from the driveway or walkway surface.

  3. Quarry Process

    Quarry process also called crusher run, is combination of stone dust, crushed stone and trap rock. Stones usually ¾ inch or less in size. Often used in construction of driveways, road base, patios and walkways as base or sub base.

  4. Marble chips

    Marble chips usually white in color, are often chosen due to their pleasing look. They range between ½ inch to 1 inch in size, should be treated in a same way as pea gravel i.e. with proper edging.

There are numerous types of gravel available some chosen because of their size and shape and some chosen for their color. For example, pea gravel is chosen because of its round shape and small size, which makes it most comfortable to walk on.

How much gravel do I need?

To determine the quantity of gravel you need. You must first calculate the volume of the gravel or area in the question. Don’t get confuse with why we used gravel with area, because volume of the gravel is same as volume of the area. Follow the steps below to calculate the volume.

  1. First measure the length, width and depth of the excavation. For example: Length = 10 ft, Width = 10 ft, Depth = 1ft.
  2. Now that you have all the measurements, multiply length with width and then multiply it with depth. Formula of volume: length x width x depth. Answer = 10 x 10 x 1 = 100 ft2. Please note that all measurements should be in same units.
  3. Finally to calculate the weight of gravel required, multiply the volume with the density of the material. Let’s assume that density of the material is 47.5723 kg/ft3. Weight of gravel required should be 47.5723 x 100 = 4757.23 kg

4757.23 Kgs is the weight of gravel you should order. But don’t forget to order extra material to allow for wastage. Also gravel like marble chips and pea gravel are known for migrating off of driveways or walkways. You may need to add extra material after every few months or may be years.

Types of gravel for driveways:

Gravel driveways, in comparison with asphalt driveways, are the least expensive option to build your driveways. But they do require most maintenance in long-term. Application of herbicide to prevent weeds from growing and adding more gravel are common tasks to maintain the driveways.

While building driveways, not one but three types of gravel are used. The first layer provides the solid foundation, consists of slightly large size rocks and is called Base Gravel #3. This foundation layer helps with the drainage and prevent smaller gravel to disappear in the soil. This layer should be at least 4 inch thick.

The second layer will be of rocks about the size of golf balls. You will need to make this layer at least 3 inches thick making sure that any gap in the base / foundation layer are filled.

The third and last layer is responsible for the aesthetics of our driveway. The gravel used in this layer can be pea gravel, marble chips of any color be it white, gray or black. It should be noted that gravel with irregular shapes such as triangles with sharp edges may work better here. Because sharper edges create a lock among them. Round shaped gravel like pea gravel move away with time if proper edging is not provided.