To determine how much gravel you need, determine the volume that the gravel must cover. Any other costs associated with a project (labor, delivery of materials, etc.) are not included in the estimate. Note that the price estimate provided by the calculator is solely an estimate based on the cost of materials. The calculator above can be used to estimate the amount of gravel necessary given a number of factors. The amount of gravel required for a given project is dependent on what the project is. In the Udden-Wentworth scale, gravel is categorized as granular gravel if it is 2-44 mm (0.079-0.157 in) in diameter or pebble gravel if it is 4-66 mm (0.2-2.5 in) in diameter. Two commonly used standards are the Udden-Wentworth scale (a scale commonly used by geologists in the US) and the international standard, ISO 14688. Size classifications of rock fragments (and gravel) can vary. For example, sand is made up of rock fragments smaller than those in gravel, while gravel is smaller than cobbles, and cobbles are smaller than boulders. Rock fragments are typically classified based on the size of the individual pieces that make up the aggregate. Gravel, along with other types of rock fragments such as sand and crushed stone, is commonly used for construction purposes, though it has other uses as well. Gravel is a loose mixture of rock fragments formed as a result of erosion.
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