What Is #57 Stone? Size, Uses, and Where to Buy

#57 stone is one of the most widely used crushed stone grades in residential and commercial construction, prized for its consistent size, excellent drainage performance, and versatility across drainage, driveway, and concrete applications. Understanding exactly what this grade is, how it is sized, and where it performs best will help you choose the right material for your project from the outset.

What Is #57 Stone?

#57 stone is an open-graded crushed stone classified under the ASTM C33 aggregate specification, with a nominal size range of approximately 1/2 inch to 1 inch. The designation “#57” refers to the sieve sizes used in the ASTM gradation standard: stone that passes through a 1-inch sieve but is retained on a No. 4 sieve (approximately 3/16 inch). In practice, most material sold as #57 gravel falls predominantly in the 3/4-inch range, with a mix of pieces running from just under 1/2 inch to just over 1 inch.

The term “57 rock” or “57 gravel” refers to the same material. Regional suppliers may use slightly different names, but if the gradation matches the ASTM C33 #57 specification, the performance characteristics will be the same regardless of what the quarry calls it.

What Does #57 Stone Look Like?

#57 stone is angular and irregular in shape because it is mechanically crushed from larger rock rather than naturally rounded by water. The surface texture is rough and fractured, which gives the individual pieces strong interlocking friction when compacted together. Colors vary by source rock: limestone #57 tends toward gray or tan, granite #57 appears speckled gray or pink, and trap rock #57 is typically dark gray to near-black.

The open-graded nature of #57 stone means there is very little fine material present. Unlike crusher run, which contains a full gradation of fines from dust up to the top size, #57 stone is washed and screened so that the spaces between pieces remain open and free-draining.

Primary Uses for #57 Stone

Drainage Layers and French Drains

#57 stone is the standard drainage aggregate for French drain systems, perimeter drains, and subsurface drainage applications. Its open-graded structure creates a high void space between pieces, typically around 30 to 40 percent of total volume, which allows water to move freely through the material without restriction. French drains built with #57 stone wrapped in geotextile filter fabric drain reliably and resist clogging better than finer aggregates. For readers planning a French drain or subsurface drainage system, the drainage design context is covered in our gravel driveway drainage guide, which explains how to pair the right aggregate with the correct filter fabric and pipe specification.

Concrete Aggregate

#57 stone is one of the most common coarse aggregates used in ready-mix and site-mixed concrete. Its size range and angular profile produce a strong concrete matrix because the pieces interlock mechanically and bond well with cement paste. Most standard structural concrete mixes specify #57 or a similar ASTM C33 coarse aggregate. If you are ordering ready-mix concrete, the batch plant will almost certainly use #57 stone as the coarse aggregate unless you specify otherwise.

Driveway Top Course

#57 stone can function as a driveway surface layer in applications where drainage is the priority and vehicle speeds are low. Because it is open-graded and angular, it does not compact tightly the way crusher run does, which means it remains permeable but also means it can shift and displace under heavy or repeated traffic. A #57 stone driveway surface works best in rural or low-traffic applications. For high-traffic driveways or anywhere a firm, stable surface is required, a compacted crusher run base with a finer topping is a more practical choice. The full comparison of driveway gravel options, including #57 stone against crusher run, pea gravel, and other materials, is in our best driveway gravel guide.

Pipe Bedding and Utility Trenches

#57 stone is the specified bedding and haunching material for many buried pipe applications, including stormwater pipe, sewer laterals, and water service lines. Its consistent sizing prevents point loading on pipe walls, and its permeability allows groundwater to drain away from the pipe zone rather than building hydrostatic pressure against the pipe.

Backfill and Retaining Wall Drainage

Behind retaining walls, #57 stone is used as a drainage aggregate to relieve hydrostatic pressure. Water that infiltrates the soil behind a wall passes through the #57 stone backfill and exits through weep holes or a drainage pipe at the base of the wall, preventing the buildup of pressure that would otherwise cause wall failure.

Is #57 Stone Good for a Driveway?

#57 stone works well as a driveway material in specific contexts, but it is not the right choice for every driveway. Its open-graded structure means it never fully compacts into a firm surface – vehicles will feel the loose aggregate shifting slightly underfoot, and lightweight material can migrate to the edges or be displaced by fast turning. For driveways that carry light traffic at low speeds, #57 stone provides excellent drainage and a clean appearance. For driveways that need a firm, stable surface under regular use, crusher run compacted to subbase provides a better foundation, with a finer gravel topping if a permeable surface is desired. The decision framework for choosing between these materials is covered in our crusher run vs crushed stone comparison.

#57 Stone vs Crusher Run

The most important difference between #57 stone and crusher run is the presence or absence of fines. #57 stone is open-graded, containing only the coarse fraction with voids between pieces. Crusher run contains a full gradation from fine dust through to the maximum aggregate size, which means it compacts into a dense, cohesive mass. #57 stone drains; crusher run compacts. For base layers under driveways and patios, crusher run compacts to a stable foundation. For drainage applications and pipe bedding, #57 stone’s open structure makes it the correct material.

#57 Stone vs Pea Gravel

Both #57 stone and pea gravel are approximately the same size, but they have very different physical profiles. Pea gravel is naturally rounded and smooth, while #57 stone is angular and fractured. The angularity of #57 stone provides better mechanical interlock and makes it more resistant to displacement under load. Pea gravel’s rounded profile means it does not interlock, which makes it comfortable underfoot for pathways and patios but unsuitable as a structural aggregate for driveways or drainage layers. For patio surface applications specifically, pea gravel is covered in our pea gravel patio guide.

How Much #57 Stone Do You Need?

#57 stone is sold by the ton at quarries and bulk material suppliers. A ton of #57 stone covers approximately 80 to 100 square feet at a 2-inch depth. For French drains and drainage trenches, coverage depends on trench dimensions rather than area, so calculate the volume of the trench in cubic feet and convert to tons using a factor of approximately 1.4 tons per cubic yard (because #57 stone’s open structure makes it lighter per unit volume than compacted materials).

For smaller projects, bagged #57 stone is available at home improvement stores, typically in 0.5 cubic foot bags. Bagged material costs significantly more per unit than bulk delivery but is practical for small drainage repairs or topping up a section of driveway.

Where to Buy #57 Stone

#57 stone is available from quarries and aggregate suppliers, ready-mix concrete plants, landscaping supply yards, and home improvement stores. For bulk quantities, a local quarry or aggregate supplier will offer the best price. Ready-mix concrete plants often sell aggregate to the public from the same stockpiles they use for their concrete batching. For small quantities, landscaping supply yards typically carry #57 in loose cubic yard increments, and home improvement stores stock it in bags.

When ordering, confirm that the supplier’s #57 stone meets ASTM C33 gradation requirements, particularly if you are using it for a structural or drainage application where specification compliance matters.

For the complete reference covering all numbered stone grades and their specifications, see our crushed stone size chart.