How Much Crushed Stone Under a 10x12 Deck?
How much crushed stone under a 10x12 deck: about 1.6 tons at 3 inches deep. The area is 120 square feet, which is 1.11 cubic yards at that depth.
Volume and tonnage calculator →The math
- Area: 120.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 120.0 × 0.250 ÷ 27 = 1.11 yd³.
- Tons: × about 1.4 tons per yard = 1.6 tons.
The crushed stone calculator does this for any size.
Related: How Much Pea Gravel Under a 10x12 Deck?
Crushed stone needed by depth
| Depth | Cubic yards | Tons of crushed stone | Tons +10% |
|---|---|---|---|
| 2 in | 0.74 | 1.0 | 1.1 |
| 3 in | 1.11 | 1.6 | 1.7 |
| 4 in | 1.48 | 2.1 | 2.3 |
| 6 in | 2.22 | 3.1 | 3.4 |
Stone for a deck
Under a deck, stone is a weed and moisture barrier rather than a structural layer. Slope the soil away from the house, lay fabric and spread 2 to 3 inches of washed stone that drains quickly.
Related: How Much #57 Stone Under a 10x12 Deck?
Prep
Remove sod and roots, level the area and slope it slightly for drainage. Install edging so the stone stays inside the footprint.
Buying the stone
Small dump trucks commonly carry around 5 to 10 tons and tri-axles more, but loads vary by truck and state, so ask the yard what fits in one trip. Crushed stone has angular faces that lock together under a compactor, which is why it holds a pad shape. Ask your supplier for their own tons-per-yard number, since stone source and moisture change it.
Planning the cost
Stone is usually priced per ton or per cubic yard, and delivery is often a separate charge based on distance. A full truckload can cost less per ton than a partial one, so it can pay to combine projects. Ask whether the quote includes tax, delivery and any small-load fee before you compare yards.
Common mistakes
People often forget that compaction reduces volume, so they come up short. Others order clean, round stone where a packable crushed stone with fines would have stayed put. Finally, dumping the whole load in one pile far from the work area adds hours of wheelbarrow trips.
Questions people ask
How many tons of crushed stone under a 10x12 deck?
About 1.6 tons at 3 inches deep.
How many yards of crushed stone under a 10x12 deck?
About 1.11 cubic yards.
How many tons of crushed stone are in a cubic yard?
Roughly 1.4 tons for planning, but suppliers vary with stone size and moisture.
Do I need to compact it?
Yes for anything that carries weight. Compact in lifts of a few inches with a plate compactor.
Related guides
- Gravel Under a Deck: Weeds, Drainage, and Depth
- How Much Does a Ton of Gravel Cover? Depth Chart
- Tons to Cubic Yards for Gravel: Conversion Chart
- Crushed Stone vs Gravel: Differences and Best Uses
- Geotextile Fabric for Driveways: Woven vs Nonwoven and How Much You Need
- Compacting a Driveway Gravel Base in Lifts
- How Much Pea Gravel Under a 10x10 Deck?
- How Much Gravel Under a 10x12 Deck?
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