Gravel for 12 × 12 ft by depth
| Depth | Cu ft | Cu yd | Tons, gravel | Tons, crushed stone | 0.5 cu ft bags |
|---|---|---|---|---|---|
| 2 in | 24 | 0.89 | 1.26 | 1.33 | 48 |
| 3 in | 36 | 1.33 | 1.89 | 2.00 | 72 |
| 4 in | 48 | 1.78 | 2.52 | 2.67 | 96 |
| 6 in | 72 | 2.67 | 3.78 | 4.00 | 144 |
| 8 in | 96 | 3.56 | 5.04 | 5.33 | 192 |
| 12 in | 144 | 5.33 | 7.56 | 8.00 | 288 |
Gravel at 1.42 t/yd³ (Engineering ToolBox); crushed stone at 1.50 t/yd³ (Hello Gravel). No extra added.
Rochester Concrete Products' install guide adds 10% for compaction and uneven ground. A 12x12 pad is a common size for a shed, hot tub or patio; see the project calculators for the depth each one calls for.
Working it out
144 sq ft × depth (in) ÷ 12 ÷ 27 = cubic yards
At 4 inches: 144 × 4 ÷ 12 = 48.0 cubic feet, ÷ 27 = 1.78 cubic yards. Multiply by the weight per cubic yard of your stone to get tons.
Common questions
How many yards of gravel for a 12x12 area at 3 inches?
1.33 cubic yards, about 1.89 tons.
How many bags of gravel for a 12x12 area?
At 2 inches deep, 48 bags of 0.5 cu ft; at 4 inches, 96.
Related calculators
Sources
- https://www.engineeringtoolbox.com/dirt-mud-densities-d_1727.html
- https://hellogravel.com/guides/2025-gravel-prices-per-ton-delivered-cost-calculator-and-regional-rates/
- https://www.doitbest.com/product/276837/
- https://rochestercp.com/resources/installation-manuals/installation-manual-vintage-6.pdf