57 Stone Calculator

Calculate 57 stone (3/4 inch gravel).

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The Ultimate Guide to #57 Stone: Uses, Calculation, and Installation

In the world of construction and landscaping, not all rocks are created equal. One of the most versatile and widely used aggregates is known as #57 Stone. Whether you are paving a driveway, installing a French drain, or laying a foundation for a concrete slab, understanding this material is essential. Our 57 Stone Calculator helps you estimate exactly how much you need, converting cubic yards to tons so you can order with confidence.

What is #57 Stone?

The number "57" refers to the sieve size analysis of the stone. It is a crushed aggregate size classification used by quarries.
Size: The stones range from about 3/4 inch to 1 inch in diameter.
Shape: It is crushed stone, meaning it has angular, jagged edges (unlike river rocks which are round). These edges allow the stones to lock together slightly, providing stability while still allowing for excellent drainage.
Composition: It can be made from limestone, granite, decorative gravel, or trap rock, depending on your local geology.

Common Uses for #57 Stone

Because of its size and drainage properties, #57 stone is a superhero in the construction world.

1. Driveways (Top Layer):
While "Crusher Run" (stone mixed with dust) is often used for the base, #57 stone is excellent for the top layer or for refreshing an existing gravel driveway. It doesn't get muddy because it contains no dust, but it can shift more than crusher run under tires.

2. Drainage (French Drains):
This is the #1 choice for French drains. The gaps between the stones allow water to flow freely into the perforated pipe and away from your home's foundation. Using smaller gravel (like pea gravel) can clog the pipe, while larger rocks are too difficult to shovel. #57 is the "Goldilocks" size.

3. Concrete Sub-base:
Before pouring a concrete slab or driveway, you need a stable base that won't trap water. A 4-inch layer of #57 stone is the industry standard for this purpose.

4. Retaining Walls:
Backfilling behind a retaining wall with #57 stone prevents hydrostatic pressure (water weight) from building up and pushing the wall over.

How to Calculate Need

To order stone, you first need to determine the volume of the area you are filling, typically in Cubic Yards.

Formula:
Length (ft) Ã— Width (ft) Ã— Depth (ft) = Cubic Feet
Cubic Feet / 27 = Cubic Yards

Example:
A driveway is 50 ft long, 10 ft wide, and needs 4 inches (0.33 ft) of gravel.
50 Ã— 10 Ã— 0.33 = 165 cubic feet.
165 / 27 = 6.11 Cubic Yards.

Converting Yards to Tons

Quarries sell stone by the ton, not by the yard. You must convert your volume to weight.
The density of limestone #57 stone is typically around 1.4 tons per cubic yard (roughly 2,800 lbs/yard).

Calculation:
6.11 Yards Ã— 1.4 = 8.55 Tons.
You would likely round up and order 9 tons to account for compaction and spill.

Installation Tips

Geotextile Fabric: Always lay down a weed barrier or geotextile fabric before placing stone on bare earth. This prevents the heavy stone from sinking into the mud over time (disappearing) and stops weeds from growing through.
Compaction: While #57 doesn't compact as tightly as road base, running a plate compactor over it helps settle the stones into a stable matrix.
Edging: Because the stones can roll, install edging (metal, plastic, or larger rocks) to keep the gravel contained within your path or driveway.

Using our calculator above simplifies the math. Just enter your required volume in cubic yards, and we will do the heavy lifting of the conversion for you.