57 Stone Calculator
— How Much Do You Need?

Number 57 stone is a crushed stone aggregate that typically ranges from 3/8 inch up to 1 inch (nominal top size 1 inch) in diameter, with most pieces around 3/4 inch. The "57" is an ASTM gradation number, not a size in inches. When you order #57 stone, you get consistently sized, angular pieces that have been crushed and screened to fit that range. It’s usually made from limestone, granite, or trap rock. The angular shape helps the stones interlock loosely and leave space for water to move through. It’s one of the most widely used aggregates in the country.

Number 57 stone is versatile and works well across residential and commercial projects. Driveways are a common use because the stone provides a stable driving surface while shedding water quickly. It also works well for drainage projects such as French drains, dry creek beds, trench drains, and backfill around pipes or foundations. It can be used as a base or sub base under concrete slabs, patios, pavers, and walkways to improve drainage and help prevent frost heave. In landscaping, it helps areas look neat and resist erosion. If you’re unsure whether #57 stone fits your project, the Hello Gravel team can help you decide.

Yes, #57 stone is a solid choice for a gravel driveway and is very popular with homeowners. The angular, crushed pieces interlock enough to support vehicle traffic while still allowing water to drain through the gaps. For driveways, a common depth is 4 inches of #57 stone, which provides a stable surface with good drainage. It does not compact as tightly as dense graded materials, so a compacted base underneath is essential — without it the stone will migrate and sink unevenly over time. For an exact tonnage estimate for your driveway, use the Hello Gravel calculator.

Number 57 stone drains very well because it is a clean, open graded aggregate. The spaces between the stones stay large, so water moves through quickly rather than pooling on the surface. This makes it a preferred choice for drainage projects such as French drains, pipe bedding around drainage pipes, and foundation backfill. To protect long term performance, consider using a geotextile fabric to separate the stone from the surrounding soil.

#57 stone does not compact tightly like some dense graded materials. It stays relatively loose, which is great for drainage. The stones are angular and interlock somewhat, so it is stable under light traffic, but it will shift a bit under heavy foot or vehicle traffic until it settles. If you want a firmer surface for a driveway, many customers put a compacted base layer first and then top with #57 stone. If you are unsure what will work best for you, the Hello Gravel team can guide your choice.