How Much Pea Gravel Under a 12x16 Deck?
A 12 by 16 foot deck covers 192 square feet. At 3 inches of pea gravel, plan on 1.78 cubic yards, or about 2.5 tons, which answers how much pea gravel under a 12x16 deck.
Volume and tonnage calculator →The math
- Area: 192.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 192.0 × 0.250 ÷ 27 = 1.78 yd³.
- Tons: × about 1.4 tons per yard = 2.5 tons.
The gravel calculator does this for any size.
Related: How Much Gravel Under a 12x16 Deck?
Pea gravel needed by depth
| Depth | Cubic yards | Tons of pea gravel | Tons +10% |
|---|---|---|---|
| 2 in | 1.19 | 1.7 | 1.8 |
| 3 in | 1.78 | 2.5 | 2.7 |
| 4 in | 2.37 | 3.3 | 3.7 |
| 6 in | 3.56 | 5.0 | 5.5 |
Deck tips
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.
Buying the stone
Most quarries and landscape yards deliver by the ton; ask whether there is a minimum and a delivery fee, and where the driver can dump without damaging your lawn. 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.
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.
Tools for the job
For anything bigger than a small path, rent a plate compactor; hand tampers cannot match it. A wheelbarrow, shovels, a hard rake and stakes with string are the rest of the kit. Wet the stone lightly before compacting so it binds.
Questions people ask
How many tons of pea gravel under a 12x16 deck?
About 2.5 tons at 3 inches deep.
How many yards of pea gravel under a 12x16 deck?
About 1.78 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.
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 Crushed Stone Under a 12x16 Deck?
- How Much #57 Stone Under a 12x16 Deck?
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