Selecting Angular Crushed Stone vs. Rounded Gravel & Graded Sands
Quarried mineral aggregates—including #57 crushed limestone and granite, dense-graded driveway crusher run (DGA), 3/8-inch washed pea gravel, river rock cobbles, decomposed granite, and ASTM-graded masonry and concrete sands—are almost always priced and weighed by the US short ton (2,000 lbs) at quarries and bulk yards, even though homeowners measure their projects in square feet and inches (cubic yards). Because mineral stone weighs between 2,400 and 3,000 pounds per cubic yard (1.20 to 1.50 tons/yd³), converting accurately between volume and tonnage prevents expensive short loads.
The most important engineering distinction in stone landscaping is angular vs. rounded particle shape. Angular crushed stone—produced by mechanically crushing quarried granite, limestone, or trap rock—has sharp faceted edges that interlock under load. Clean #57 stone (3/4-inch screened stone with zero dust fines, ~2,700 lbs/yd³) provides 35% to 40% open void space, making it the standard choice for French drains, retaining wall backfill, and top-dressed driveways. Crusher run / Quarry Process (3/4-inch stone blended with stone dust fines, ~2,800 lbs/yd³) compacts with a vibrating plate compactor into a weatherproof, concrete-hard sub-base for driveways and patio pavers.
Rounded aggregates—such as 3/8-inch pea gravel and 1-to-3-inch river rock (~2,600 lbs/yd³)—have been smoothed by water erosion. Because smooth spheres cannot lock together, pea gravel should be kept to 2 to 3 inches deep on garden paths and play areas; pouring pea gravel 5 inches deep creates a shifting "quicksand" effect underfoot.
Similarly, sand selection depends on grain angularity. Fine sub-angular play sand and ASTM C144 masonry sand (~2,600 lbs/yd³) feel soft underfoot in sandboxes, above-ground pool bases, and lawn leveling mixes. Coarse washed ASTM C33 concrete sand (~2,700 lbs/yd³) contains sharp, multi-sized grains that resist washing out and must be used for the 1-inch screeded bedding layer beneath interlocking patio pavers.
Compaction Allowances, Geotextile Fabric & Quarry Ordering Tips
The 1.35 to 1.40 Tons-per-Cubic-Yard Quarry Conversion
When a stone yard asks how many tons you need, multiply your calculated cubic yards by 1.35 for clean #57 stone or pea gravel, and by 1.40 for crusher run road base or damp concrete sand.
Add 10% to 15% for Mechanical Plate Compaction
Loose crusher run, decomposed granite, and paver base sand compress by 12% to 18% when watered and compacted with a vibratory plate tamper. Select the 10% or 15% overage option so your compacted base hits full design thickness.
Install Woven Geotextile Under Driveways, Non-Woven Under Drains
Prevent expensive crushed stone from sinking into muddy clay subgrades over time by laying heavy geotextile separation fabric over the bare soil before dumping stone.
Standard Bulk Material Densities & Coverage Reference
Compare typical weights per cubic yard and recommended application depths from our verified engineering and university extension reference library:
| Material | Planning Density | Typical Range | Tons / yd³ | Rec. Depth |
|---|---|---|---|---|
| Shredded Hardwood Bark Mulch (Dry/Seasoned) | 600 lbs/yd³ | 400–800 lbs | 0.3 tons | 2"–3" |
| Cedar or Pine Bark Mulch / Nuggets | 500 lbs/yd³ | 400–600 lbs | 0.25 tons | 2"–4" |
| Fresh / Damp Arborist Wood Chips | 800 lbs/yd³ | 700–1000 lbs | 0.4 tons | 3"–4" |
| Recycled Rubber Mulch Nuggets | 1100 lbs/yd³ | 1000–1250 lbs | 0.55 tons | 1.5"–3" |
| #57 Crushed Stone (3/4" Clean Angular Limestone/Granite) | 2700 lbs/yd³ | 2600–2900 lbs | 1.35 tons | 3"–4" |
| Driveway Crusher Run / Quarry Process (DGA Base with Fines) | 2800 lbs/yd³ | 2700–3100 lbs | 1.4 tons | 4"–6" |
| Pea Gravel (3/8" Rounded Washed Stone) | 2600 lbs/yd³ | 2500–2800 lbs | 1.3 tons | 2"–3" |
| River Rock Cobbles (1" to 3" Smooth Stone) | 2600 lbs/yd³ | 2400–2800 lbs | 1.3 tons | 3"–4" |
| Decomposed Granite (DG Pathway Fines) | 2800 lbs/yd³ | 2700–3000 lbs | 1.4 tons | 3"–4" |
| Volcanic Lava Rock (Scoria Landscape Stone) | 1300 lbs/yd³ | 1100–1500 lbs | 0.65 tons | 2"–3" |
Frequently Asked Questions (Stone & Sand)
How many tons is 1 cubic yard of gravel or sand?
One cubic yard of pea gravel or dry masonry sand weighs approximately 1.30 tons (2,600 lbs). One cubic yard of #57 crushed stone or washed concrete sand weighs 1.35 tons (2,700 lbs), and dense driveway crusher run weighs 1.40 tons (2,800 lbs).
How many 50 lb bags of gravel or play sand equal 1 cubic yard?
Standard 50-pound retail bags of gravel, pea stone, and play sand hold approximately 0.50 cubic feet. It takes 54 bags (27 ÷ 0.50 = 54) to equal 1 cubic yard.
How deep should gravel be for a residential driveway?
Refreshing an existing firm gravel driveway requires a 2- to 3-inch topdress of #57 stone. Building a new gravel driveway over soil requires 4 to 6 inches of compacted crusher run base topped with 2 to 3 inches of #57 surface stone.