#57 vs #8 vs Crusher Run: Which Gravel for Which Job

The first time we ordered gravel for a project, we asked the yard for “a yard of gravel” and got handed a price quote that included six different products. The guy asked what we were doing with it, and when we said “drainage around a foundation,” he switched the order to #57 without explaining why.

Years later, we know why. But almost nobody explains the gravel size system in plain English on the internet, and the products at Home Depot are labeled inconsistently between brands. So here's the field guide we wish we had.

What the numbers actually mean

The numbers come from a specification system originally written for highway construction. Lower numbers usually mean larger stones. The size refers to the opening of the screen the gravel passed through.

Here are the only sizes a homeowner needs to recognize:

The two you'll actually buy 80% of the time are #57 and crusher run. Everything else is for special cases.

#57 stone, when to use it

#57 is the workhorse of drainage gravel. Half-inch to one-inch angular stones, all roughly the same size, with no fine particles. The lack of fines is what makes it drain. Water runs straight through.

Use it for:

• French drains. Wrap a perforated pipe in fabric, lay it in a trench, fill the trench with #57. Done.
• Foundation drainage. A 12-inch ring of #57 around a foundation footing keeps groundwater away from the wall.
• The base under a concrete slab. A 4-inch layer of #57 under a slab gives you drainage and prevents the slab from sitting in standing water.
• Backfill for a sump pit.
• Inside a dry well.

Do not use it for:

• Paver base (it doesn't compact properly because the stones are all the same size, they roll past each other instead of locking together)
• Driveway surface (cars spin tires on it and dig craters)
• Walkway surfaces (it's too coarse to walk on comfortably)

#8 pea gravel, when to use it

#8 is the rounded, smooth stuff that looks like decorative pea gravel at a garden center. It's what most people picture when they hear “gravel.”

Use it for:

• Decorative top dressing in flower beds and around trees
• Top course on a walkway over a compacted crusher run base
• Drainage in tight spaces where #57 is too chunky
• Around drainpipe in narrow trenches
• Patio joint filler where polymeric sand isn't appropriate (under heavy tree cover, for example)

Do not use it for:

• Driveways (compacts too soft, cars sink in)
• Anywhere it can scatter onto a concrete or paved surface (it gets thrown by tires and creates chip damage)
• Slab base (drains okay but doesn't lock as well as #57)

The other thing about #8: it migrates. Rain moves it, wind moves it, kids' feet move it. If you put down a 2-inch layer of #8 on bare ground, half of it ends up in your lawn within two years. It needs an edge, a bed, or a binder.

Crusher run, when to use it

Crusher run is the compactable gravel. It's a mix of stone dust, fine particles, and angular stone up to about 1.5 inches. The fines fill the gaps between the larger stones and lock everything together when you compact it. After a plate compactor goes over crusher run a few times, it's basically a stone slab.

Use it for:

• Driveway base (the layer under whatever surface you're putting on top)
• Driveway surface if you're doing a true gravel driveway
• Paver patio base (this is the right gravel for under pavers)
• Concrete slab subbase when you want rigidity instead of drainage
• Retaining wall base course
• Path bases under any surface treatment

Do not use it for:

• Drainage (it's the opposite of drainage, the fines block water from passing through)
• Anywhere standing water is a concern
• Around foundation drainpipe (will silt up the perforations)

The naming is regionally inconsistent. Crusher run is also called crushed run, crush and run, ABC (Aggregate Base Course), DGA (Dense Graded Aggregate), road base, or 21A. They're all roughly the same thing: a graded mix from dust to about 1.5-inch stones designed to compact hard.

#10 stone dust, when to use it

This is the powder. Crushed limestone or granite ground to a sand-like consistency.

Use it for:

• Setting bed under pavers (a 1-inch layer of stone dust between the crusher run base and the pavers themselves)
• Joint filler under polymeric sand or as a polymer-free joint sand
• Leveling layer under flagstone

Do not use it for:

• Anywhere drainage matters
• Under heavy traffic (compacts too rigid for vehicle loads)

Stone dust is what makes the difference between a paver patio that lasts 30 years and one that fails in 5. The dust between the crusher run and the pavers gives you a thin adjustment layer to set each paver perfectly level. Skipping it means setting pavers directly on chunky compacted base, and they will rock.

A complete paver patio cross-section

To make this concrete, here's the gravel layering for a 12×12 paver patio:

1. Excavate to 9 inches below finished paver height
2. Crusher run: 6 inches, compacted in 2-inch lifts with a plate compactor
3. Stone dust (#10): 1 inch, screeded smooth
4. Pavers, set, leveled, edged
5. Polymeric sand or stone dust swept into joints

That's three different gravel products in one patio. Each one does a job that the others can't. A lot of failed patios are using #57 where they should have used crusher run, or skipping the stone dust layer entirely.

How much do you actually need?

Gravel is sold by weight (tons) when delivered, by cubic foot when bagged at Home Depot or Lowe's, and by cubic yard when ordered from a yard. The conversions:

• 1 cubic yard = 27 cubic feet
• 1 cubic yard of gravel ≈ 1.4 tons (varies slightly by stone type)
• 1 ton of gravel ≈ 0.7 cubic yards
• A bagged 0.5 cubic foot of pea gravel at Home Depot costs about $5; the same volume from a delivered cubic yard costs about $1.50

The break-even point on bagged versus bulk delivery is about 1 cubic yard. Less than that, bags from the store make sense. More than that, you're throwing money away not ordering bulk.

A typical full-size pickup truck (F-150, Silverado 1500, Ram 1500) can carry 1 cubic yard of gravel safely, that's about 2,800 lb. Don't try to haul 2 yards in a half-ton truck. The springs will not love you.

Common gravel mistakes

We've seen all of these in reader emails:

• Using #57 as a paver base. The most common one. Pavers laid on #57 will rock and shift because the stones don't lock together. Use crusher run.
• Putting crusher run in a French drain. The fines clog the drainage immediately. Use #57.
• Skipping the stone dust layer under pavers. Pavers go directly on crusher run, which is too coarse to set them level. They rock from the first season.
• Using pea gravel as a driveway surface. Cars spin out on it. The gravel migrates into your lawn. Use crusher run.
• Ordering gravel by weight without checking yardage. A “ton” of #57 versus a “ton” of crusher run is roughly the same weight but different volumes. If your project needs a specific volume, order in cubic yards.
• Forgetting that bulk delivery has a minimum. Most yards won't deliver less than 3 cubic yards. If you need 1.5 yards, you're either paying for 3 or buying bags.

Last updated May 2026