How Much Pea Gravel Under a 12x12 Deck?
A 12 by 12 foot deck covers 144 square feet. At 3 inches of pea gravel, plan on 1.33 cubic yards, or about 1.9 tons, which answers how much pea gravel under a 12x12 deck.
Volume and tonnage calculator →The math
- Area: 144.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 144.0 × 0.250 ÷ 27 = 1.33 yd³.
- Tons: × about 1.4 tons per yard = 1.9 tons.
The gravel calculator does this for any size.
Related: How Much Gravel Under a 12x12 Deck?
Pea gravel needed by depth
| Depth | Cubic yards | Tons of pea gravel | Tons +10% |
|---|---|---|---|
| 2 in | 0.89 | 1.2 | 1.4 |
| 3 in | 1.33 | 1.9 | 2.1 |
| 4 in | 1.78 | 2.5 | 2.7 |
| 6 in | 2.67 | 3.7 | 4.1 |
Building the deck base
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 Pea Gravel Under a 12x20 Deck?
Prep
Remove sod and roots, level the area and slope it slightly for drainage. Install edging so the stone stays inside the footprint.
Getting it delivered
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. Pea gravel is small and rounded, comfortable underfoot, and needs edging because it rolls. The scale ticket is the real weight; tons per yard here is a planning figure.
Measuring the area
Measure length and width in feet at a few points and use the largest figures, since real sites are rarely square. For odd shapes, split the area into rectangles and circles, work out each one and add them together. Depth is the number most people underestimate: drive a stake, run a level string and measure down to the dug-out surface in several spots.
Common mistakes
The most frequent problem is ordering for the finished depth without allowing for compaction, which can shrink a loose layer by 10 to 20 percent. Another is skipping fabric on soft soil and watching the stone vanish into the mud over the first wet season. Spreading everything in one thick layer instead of compacted lifts also leaves a soft, rutted surface.
Questions people ask
How many tons of pea gravel under a 12x12 deck?
About 1.9 tons at 3 inches deep.
How many yards of pea gravel under a 12x12 deck?
About 1.33 cubic yards.
How many tons of pea gravel are in a cubic yard?
Roughly 1.4 tons for planning, but suppliers vary with stone size and moisture.
Should I put landscape fabric under the stone?
On soft or clay soil, a woven geotextile keeps stone from sinking into the dirt and makes the layer last longer.
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 Crushed Stone Under a 12x12 Deck?
- How Much #57 Stone Under a 12x12 Deck?
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