Enter the length, width, and depth of the area to be covered into the calculator to determine the amount of crusher run needed.
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Crusher Run Formula
The following formula is used to estimate the amount of crusher run needed for a project:
CR = (L * W * (D / 12) / 27) * ρ
Variables:
- CR is the estimated amount of crusher run needed (in short tons)
- L is the length of the area to be covered (in feet)
- W is the width of the area to be covered (in feet)
- D is the finished depth of the crusher run layer (in inches)
- ρ is the bulk density of crusher run (in short tons per cubic yard). A common estimating value is about 1.25 short tons/yd³, but it varies by material and compaction.
To calculate the amount of crusher run needed, first convert the depth from inches to feet (D ÷ 12) to get cubic feet, then divide by 27 to convert to cubic yards. Multiply by the material density (ρ) to convert volume to weight (tons). When ordering, it’s common to add extra (often around 5–10%) for compaction, waste, and uneven subgrade.
What is a Crusher Run?
Crusher run, also known as crush and run, is a type of gravel that is commonly used in places where motor vehicles are often driven or parked. It is a mix of stone dust (fines) and small crushed stone, making a strong, compactable base layer for driveways. Depending on the product/specification, it is typically a graded mix from stone dust up to about 3/4 in (19 mm) or sometimes around 1 in (25 mm), with jagged edges that help the pieces compact and lock together.
This makes it a popular base for creating walkways, driveways, and patios. It is also used as a base material under highways, driveways, roads, and concrete. It is easy to handle and compact, making it a popular choice for construction projects.
