How Much Does 18 Tons of Crushed Stone Cover?
How much does 18 tons of crushed stone cover depends on how deep you spread it. At about 1.4 tons per cubic yard, 18 tons is roughly 12.9 cubic yards. Spread 4 inches deep, that covers about 1,041 square feet. Go thinner and it covers more; go deeper and it covers less.
Volume and tonnage calculator →How the coverage is figured
- Tons to cubic yards: 18 ÷ 1.4 = 12.9 yd³.
- Cubic yards to cubic feet: × 27 = 347 cu ft.
- Divide by depth in feet: at 4 inches (0.333 ft), 347 ÷ 0.333 = 1,041 sq ft.
Coverage of 18 tons at different depths
| Depth | Square feet covered | Square yards |
|---|---|---|
| 2 in | 2,083 | 231 |
| 3 in | 1,389 | 154 |
| 4 in | 1,041 | 116 |
| 6 in | 694 | 77 |
About crushed stone
Crushed stone has fractured faces, so the pieces interlock when compacted. That is why it holds a driveway or pad shape better than round stone of the same size. Weight runs about 1.35 to 1.5 tons per cubic yard, so treat the table as a planning range rather than an exact figure.
Putting 18 tons to use
For delivery, 18 tons means multiple trips or a larger truck. Ask the supplier how they will split it. Spread from the pile with a loader, skid steer or wheelbarrow, then rake to depth before compacting if the material calls for it.
- Check depth as you go. Stakes marked at the target depth help keep the spread even.
- Expect some loss. Compaction and uneven ground use more than the flat-math figure. Keep about 10 percent in reserve.
- Ask about moisture. Wet material weighs more, so a ton of it covers less.
To run your own numbers, use the volume and tonnage calculator.
Good and poor uses for crushed stone
Good uses:
- Driveway top courses and parking pads
- Shed and hot tub bases
- Backfill behind walls when a clean size is used
Poor fit for:
- Barefoot areas, since angular stone is rough
- Play areas
- Places that need a smooth rolling surface for wheels
Quick reference numbers
- Per inch over 100 sq ft: about 0.43 tons of crushed stone (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.3 tons.
- Another size for comparison: a 8x16 area at 4 inches takes about 2.2 tons.
- Weight used here: about 1.4 tons per cubic yard.
Where estimates go wrong
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Questions people ask
How many cubic yards is 18 tons of crushed stone?
About 12.9 cubic yards at 1.4 tons per yard.
How many square feet does 18 tons of crushed stone cover at 4 inches?
About 1,041 square feet.
How many square feet does 18 tons cover at 2 inches?
About 2,083 square feet.
How much does a yard of crushed stone weigh?
About 1.35 to 1.5 tons.
Will 18 tons fit in one truck?
It depends on the truck. Single-axle dump trucks often carry under 10 tons and tandems around 13 to 16; your supplier will know their limits.
Related guides
- How Much Does a Ton of Crushed Stone Cover?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
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